Soundproof Your Studio

Wilson Harwood
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I teach you how to build a soundproof studio. Even if you know nothing about soundproofing or construction I go in depth to turn you from a total beginner into a soundproofing master.

  1. -1 h

    Does Green Glue Actually Work? What 20 Lab Reports Show.

    Does Green Glue Actually Work? What 20 Lab Reports Show  I never was a huge fan of Green Glue, I thought it wasn’t worth the money. This year, a real project made me stop and actually read the lab data instead of going back to my catchall “I don’t use Green Glue”. What I found changed how I view the product, and it explains something I had noticed for years without fully understanding why: my designs kept hitting their isolation targets without it even though many people still swear by it.   This is not a takedown. Green Glue works. The interesting question, the one nobody answers out loud, is exactly when it works and when it doesn’t. The project that started this We were designing a basement studio with a ceiling height problem. Every inch mattered, and every dollar had a job. The question on the table was simple: does Green Glue earn its material and labor cost in this assembly, or not?   The marketing answer is that Green Glue adds 8 to 10 dB. And that number is real. But it comes from one specific test condition that almost nobody names, and once you see it, you cannot unsee it. What Green Glue actually does Green Glue is a damping compound. Sandwiched between two layers of drywall, it converts the drywall's vibration into small amounts of heat instead of letting that vibration radiate through as sound. That is genuinely clever engineering, and it matters most under one condition: the drywall has to be driven hard by vibration arriving through a rigid connection to the framing.   Which raises the question that reframes everything. What happens when the drywall is not being driven hard, because you already decoupled the wall? What the lab data shows I went through the full Green Glue test database, 20 laboratory reports from Orfield Laboratories spanning 2005 to 2010, all run under ASTM E90. I pulled every comparison where the only variable was Green Glue itself, meaning the same stud material, the same insulation, the same layer count, the same spacing, with and without the compound. That filter matters. Several of the commonly quoted comparisons quietly change the insulation between the "before" and "after" tests, which inflates the apparent benefit.   Here is what the clean comparisons show.    Within each stud material, Green Glue's benefit shrinks as the wall becomes more decoupled. Wood and steel clusters are separate tests and should not be compared to each other.   On a rigid wood stud wall, Green Glue added 11 STC points, from 44 to 55. That is a massive gain, and it is where the marketing number comes from. Add resilient channel to a wood wall and the benefit drops to 8 points. On steel, a rigid wall gained 6 points, but the same steel wall built with isolation clips and hat channel gained only 2, from STC 62 to 64.   The pattern is consistent with the mechanism. Green Glue intercepts vibration that reaches the drywall through a rigid path. Clips and hat channel interrupt that path before the drywall ever becomes the bottleneck. A well-decoupled wall has already solved most of the problem Green Glue solves.   One honest caveat that I will repeat because it matters: each of these comparisons is a single lab test pair, not a statistical distribution. The right phrase is "consistent with," not "proven." Where the remaining 2 points actually live The cleanest single comparison in the entire database is a clip and hat channel steel wall, double 5/8" drywall on both sides, tested with no Green Glue and then with Green Glue at both interfaces. Identical assemblies otherwise. This is the true zero versus full comparison, and because both tests published complete frequency data, we can see exactly where the improvement lives.   In a decoupled wall, Green Glue gained 0 to 2 dB below 200 Hz. Nearly all of its +2 STC came from the 2,500 to 4,000 Hz coincidence dip.   Below 200 Hz, where drums and bass live, the gain was 0 to 2 dB. Nearly everything Green Glue contributed shows up between 2,500 and 4,000 Hz, patching a resonance phenomenon called the coincidence dip. In a decoupled wall, Green Glue is a treble fix, not a bass fix.   For a studio designer, that is the whole ballgame, because bass isolation is the hard part and the expensive part. Which brings up the question that decides whether those 1 to 2 low-frequency decibels are worth paying for. What does 1 to 2 dB actually sound like? Three numbers from the hearing science literature put this in perspective.   A perceived halving of loudness takes roughly 10 dB. Green Glue's low-frequency contribution in a decoupled wall sits at the edge of what humans can detect at all.   First, 3 dB is a doubling of physical sound energy, and it is roughly the threshold of what people reliably notice in real-world listening. Second, the just noticeable difference under ideal laboratory A/B switching is about 1 dB, and trained listeners at the easiest levels and frequencies can catch a quarter to half a decibel. Third, it takes roughly 10 dB, ten times the physical energy, before people judge a sound to be twice or half as loud. That last figure comes from S.S. Stevens' power law, published in 1957, and it has been the foundation of loudness science ever since.   So Green Glue's 1 to 2 dB of low-frequency benefit in a decoupled wall sits at or below the edge of human detectability, and nowhere near a perceived halving of sound. If you master records for a living, maybe you would catch it in a direct comparison. Your neighbor will not.   One nuance for the sharp readers: perception does vary somewhat across the frequency spectrum, and a decibel in the deep bass counts perceptually for a bit more than a decibel in the midrange. But the bands where that effect is strongest, below 80 Hz, are exactly the bands where the lab data shows Green Glue adding nothing at all. The nuance is real. It just does not change the conclusion. While we are here: your STC rating is not what you think it is This research surfaced something bigger than Green Glue, and if you take one thing away from this article, make it this.   An STC 64 wall is not a 64 dB wall. STC is a unitless rating produced by fitting a reference contour to measured data between 125 and 4,000 Hz. It contains no information about performance below 125 Hz at all.   The highest-rated wall in the database, STC 64, measures 71 dB at 3,150 Hz, 36 dB at 80 Hz, and 17 dB at 50 Hz. The rating only sees 125 to 4,000 Hz.   The best wall in this entire database, the STC 64 clip wall, delivers 71 dB of transmission loss at 3,150 Hz. At 80 Hz it delivers 36 dB. Down at 50 Hz, in the resonance valley every double-leaf wall has, it measures 17 dB. That is a 47 point gap between the number on the spec sheet and the measured performance at a frequency a bass guitar produces every time it plays a G.   This is exactly why we design low-frequency-sensitive rooms from transmission loss data and physics, never from an STC rating. It is also why the basement ceiling decision was easy once we looked at the data: that assembly was already well decoupled, and the money had better places to go. So, does Green Glue work? Yes. Genuinely, measurably, and in the walls most people are actually building. If you are treating a condo party wall, an apartment ceiling, or any assembly where full decoupling is not in the budget or the floor plan, Green Glue delivers some of the best dollar-for-dollar improvement available, up to 11 STC points in the lab data. I recommend it for those situations without hesitation.   But once you are building a properly decoupled assembly, the kind we engineer for serious studios, its measurable contribution drops to 1 to 2 dB in the bass and a few dB in the treble, an increment that sits at the edge of human perception. Using it there is not wrong. It is just not where the leverage is anymore.   That is why you will not see Green Glue in our designs. Not because it does not work. Because we now know exactly when it does, and exactly how much it is worth. Designing a studio and want the data-driven version of this thinking applied to your room? If you are planning a serious build, take our soundproof site assessment and discover whether where you want to build is going to be working for you or against you when it comes to sound isolation. Soundproof Site Assessment Sources: Orfield Laboratories test reports OL05 through OL10 series (ASTM E90/E413); Stevens, S.S. (1957), "On the psychophysical law," Psychological Review 64(3); ISO 226 equal-loudness contours; see also the peer-reviewed just-noticeable-difference literature summarized in our research notes. Lab report data referenced under fair use for analysis and commentary; charts are our own analysis.

  2. -6 j

    Soundproofing a Basement Drum Room - The Ceiling Decision I Almost Got Wrong

    SOUND ISOLATION DESIGN · SPYS DESIGNS The Ceiling Trade-Off: Why More Drywall Wasn't the Answer in This Basement Sound Isolation Build A client we'll call Sam wanted to play drums in his basement and hold band rehearsals with his bandmates. The goals were simple to state and hard to deliver: don't bother the neighbors, and keep as much sound as possible out of the rest of the house. The walls weren't the hard part. We specified a double-wall system, removed the windows, and built in a double-door system at the entry. None of that required much debate. The ceiling did. Why the Ceiling Is Almost Always the Weak Link In a basement build, the ceiling carries more risk than any other surface. It's the boundary between the room you're isolating and the living space directly above it, and in Sam's case the available height was already tight: 7 feet 2.5 inches to start. Every inch of buildup is an inch of headroom he loses in a room built for playing drums standing up. The baseline design, which we'll call Option A, was a decoupled ceiling: GenieClip LB3 clips and furring channel carrying two layers of 5/8-inch drywall below the joists, with fiberglass batt insulation in the joist bays. We specified the LB3 deliberately because it's a low-profile clip — the clip and channel together cost only about a quarter inch of height, which matters enormously at 7 feet 2.5 inches. The Option on the Table The question was whether to go further. Option B added two more layers of 5/8-inch drywall inside the joist bays, tight against the underside of the subfloor above — extra mass on the floor side of the assembly. On paper, more mass means better isolation. In practice, it comes with two costs that don't show up in a spec sheet. First, it's labor-intensive, and in-bay drywall only performs if every single bay is fitted tight and sealed. Miss the seal on a few bays and you've given back much of what you paid for. Second, that labor costs real money and real time on the schedule. The strongest assembly on paper isn't automatically the right call for the room in front of you.  What Was Already Sitting on Top of That Ceiling A ceiling like this behaves as a two-leaf system: the floor assembly above is one leaf, the hung ceiling below is the other, and the system's resonant frequency — the point where the assembly performs at its worst — is driven mainly by the mass of the lighter leaf. Since the hung ceiling is identical in both options, the leaf that decides everything is the floor above. Sam measured his own floor for us and confirmed hardwood over a diagonal board subfloor, consistent with the 1920s construction of the house. We estimated that assembly at roughly 5 pounds per square foot. That is a genuinely heavy leaf before any additional drywall goes in. Client-provided photo, no faces. Subfloor and Hardwood Floor Measurement The Math, Worked This isn't a black box. The resonant frequency of a decoupled two-leaf assembly follows a known formula, and it's worth showing the actual arithmetic rather than just citing a result: f₀ ≈ 170 × √[ (1/m₁ + 1/m₂) / d ]  —  masses in psf, air gap in inches, f₀ in Hz Plug in Option A's numbers: a 4.4 psf hung ceiling, a 5.0 psf floor above, and a 11 ¼ -inch air gap in the joist bay, and the resonance works out to approximately 33 Hz. Add the two extra layers of bay drywall for Option B, which raises the floor-side leaf to 9.4 psf without reducing the gap (the added layers sit flush against the subfloor, not floating in the cavity), and the resonance drops to approximately 31 Hz.     Same ceiling, same formula. The only input that changes between the two options is the mass on the floor side. That's the entire design decision, reduced to arithmetic — which is exactly the point. This is design judgment applied to real numbers, not a guess dressed up as an opinion. Why the Kick Drum Is the Real Test, Not the Bass A natural question once you've got a resonance number: what in the room actually needs to clear it? For a drum and bass rehearsal space, the two candidates are the kick drum and the bass guitar, and it's worth being precise about both. An acoustic kick drum's fundamental typically falls between 40 and 80 Hz, with almost nothing meaningful below about 35 to 40 Hz. Both Option A and Option B's resonance sit below that entire range, with Option A carrying the wider margin of the two. The bass guitar is a tighter case. A standard 4-string bass in standard tuning has an open low E string at 41.2 Hz — its lowest note without drop-tuning. That's only about 5 Hz above Option A's 36 Hz resonance, and it sits closer to the resonance than the kick's entire range does. If Sam's bassist ever drop-tunes to D, that string falls to roughly 36.7 Hz, landing almost exactly on Option A's resonant frequency — the single worst-performing point in the whole assembly.   And yet in practice, the kick and snare are consistently the real problem, not the bass. The reason isn't frequency, it's level. Transmission loss is a fixed reduction in decibels for a given assembly at a given frequency — what actually reaches a neighbor is the source's loudness minus that reduction. A kick drum struck close-mic'd can hit peak sound pressure levels well over 100 dB at the moment of impact. A bass guitar, even amplified, is typically producing meaningfully less peak level for a sustained note. That gap in loudness outweighs the small frequency advantage the bass would otherwise have from sitting nearer the resonance. There's a second factor working against the kick and snare specifically: they're transient, impulsive hits, and human hearing is measurably more sensitive to sudden onset sound than to a continuous tone of the same average energy — part of why some community noise ordinances apply a specific penalty to impulsive sources. A sustained bass note is easier to tune out than a kick hit, even at equal loudness. One honest caveat: at very high sound pressure levels, low-frequency impact energy can excite an assembly in ways a straightforward transmission-loss calculation doesn't fully capture — harder panel excitation, flanking paths that wouldn't trigger at lower levels. We don't have hard numbers to quantify that effect here, but it's a real part of why intensity, not just frequency, belongs in the conversation. The Green Glue Question Green Glue came up too, and it's worth addressing directly because it's a common recommendation. Once a ceiling assembly is properly decoupled, Green Glue isn't solving a rigidity problem anymore — it's solving a connection problem, and the connection is already broken by the decoupling. In a system like Sam's, it adds cost without adding meaningful isolation. The Actual Decision We went with Option A, and redirected the money and attention toward making sure the walls and doors actually hit their design numbers. Not because more mass is wrong — in a different ceiling, with a lighter floor above and a bigger height budget, Option B would have been the right call. It wasn't the right call here. This is the part of sound isolation design that doesn't show up in a formula alone: weighing acoustic performance against installation risk, labor cost, and the real physical constraints of the space in front of you. It's better versus worse, not right versus wrong — and that judgment, built on real math rather than a guess, is the actual work. FACING A DECISION LIKE THIS ON YOUR OWN PROJECT? Book a Sound Isolation Site Assessment and we'll walk through the tradeoffs on your space. soundproofyourstudio.com/plan

  3. 13 juil.

    He Researched Whisper Rooms and Rejected Them. Here's What He Built Instead.

    SOUND ISOLATION DESIGN  ·  SPYS DESIGNS He Researched Whisper Rooms and Rejected Them. Here's What He Built Instead. Jim Datovech didn't need convincing that his home voiceover setup had a noise floor problem. He already owned a Sennheiser MKH50, a pair of Neumann mics including a U87 AI, and an RME interface with clean A-to-D conversion. The gear wasn't the issue. The room was. Like most serious voiceover professionals working from home, Jim started where most people start: he tried to fix the room himself. The Blanket Fort in the Basement Before he ever spoke to SPYS Designs, Jim picked a corner of his basement, hung blankets around it, and built what he describes as a kind of fort, complete with a light and a microphone stand inside. It handled reflections reasonably well. It did nothing for outside noise. “That's the biggest challenge. Footfalls from upstairs, the doorbell ringing, the garbage disposal coming on. The blankets and the acoustic treatment don't stop sound.” Footfalls from upstairs. The doorbell. A garbage disposal two rooms away. Every one of them made it into his recordings, no matter how many blankets he added. That's the distinction most people researching a home studio never hear articulated clearly: acoustic treatment shapes the sound already inside a room. It does nothing to stop sound from entering it in the first place. Why the Whisper Room Wasn't the Answer Either Once Jim realized blankets weren't going to solve the outside noise problem, he did what most people in his position do next: he researched the commercial isolation booth options, whisper rooms and studio bricks among them. He didn't dismiss them out of hand. He calls them great products, and says plenty of people are happy with them. But two things ruled them out for his situation. The smaller units felt too much like working inside a closet. And once he sized up to something roomier, the price started closing in on what a custom-built space would cost, without the flexibility or the finished look. That second point mattered more than it might seem. Jim also creates YouTube content, and he wanted whatever was behind him on camera to look like a real, finished room, not a foam-lined box. A whisper room interior doesn't read that way on video. The Room That Actually Solved It What Jim built instead is a purpose-designed space engineered around two goals: full sound isolation from the rest of the house, and acoustic treatment tuned specifically for spoken-word recording, not music or full-band tracking. He describes the room, right after the drywall went up and before any treatment was installed, as the best echo chamber he'd ever heard: sound bouncing around with nowhere to go until it died out on its own. Once the treatment went in, including 16-inch GIK bass traps from ceiling to floor, that echo disappeared entirely, and what was left was a controlled, dead-quiet space with nothing coupling in from outside. “When you take away all the problems of your room, you suddenly have just the microphone and your ability to do good voiceover work. It narrows it down to just your own talent.” What This Actually Means If You're Considering the Same Thing Jim's situation is a useful test case precisely because he did the research most people skip. He tried the free option first. He seriously evaluated the commercial off-the-shelf option. And he still landed on a custom-designed room, not because the other options were bad products, but because none of them solved the specific problem he had: outside noise coupling into a space where his gear could otherwise perform at its ceiling. If you're weighing the same decision, that's the actual question worth answering before you spend anything: is the goal to treat the sound already in your room, or to stop the sound that isn't yours from getting in at all? Those are two different problems, and they require two different solutions. If you're planning a space that needs to actually keep outside sound out, not just sound better inside, start with a Soundproof Site Assessment.

  4. 6 juil.

    The Part of the Fee Nobody Talks About

    When people hire me to design a sound isolation system, they often think they're paying for a set of drawings. They're not. The drawings are only one part of the process. The real work continues throughout construction—answering contractor questions, adapting to field conditions, reviewing material substitutions, and solving problems before they become expensive acoustic failures. In this episode, I share real stories from active projects that show what design coordination actually looks like and why I believe it's one of the most valuable parts of what I do. From permitting handoffs to on-site construction questions, these are the conversations that help keep projects on track and protect the performance of the finished room. If you're planning a recording studio, podcast studio, music room, or any space where sound isolation matters, I'd love to learn more about your project. Start with a Site Assessment:Click Here If you found this episode helpful, I'd appreciate it if you followed the show on Apple Podcasts or Spotify. It helps more people discover the podcast, and you'll never miss a future episode.

  5. 29 juin

    What a $3M Show House Listening Room Actually Requires

    SPYS DESIGNS  ·  SOUND ISOLATION DESIGN   What a $3M Show House Listening Room Actually Requires Sound isolation design on a multi-million dollar show house means coordinating five professional teams, solving three HVAC decisions before the first meeting, and documenting every choice before a single tool touches the space. This project is not a typical residential build. A show house is a home constructed specifically to be toured, where each room is designed and finished by a different team of professionals to demonstrate what is possible at the highest level of residential construction. Our room is the dedicated listening room. When SPYS Designs is brought onto a project like this, the question is not just whether the room will perform acoustically. The question is whether five separate professional teams, each with their own scope, their own schedule, and their own opinions — will arrive at a coherent set of decisions before construction begins. That coordination problem is our job to solve. Here is what it actually takes.   THE PROJECT Why a Show House Raises the Stakes A private residential project has a single client and a builder. A show house has an architect of record, a general builder, a mechanical engineer, a separate acoustic design firm handling room acoustics and treatment, and our team handling sound isolation design and HVAC coordination. Every decision gets scrutinized by other professionals. There is no hiding a coordination failure when the finished room is being shown to architects and builders as an example of best practice. The standard is not just whether the room performs. The standard is whether every party involved can look at the documentation and confirm that their scope is clean. This conversation happens on paper, not on site. Five parties. One room. Every decision documented before a single tool touches the space.     The coordination diagram above reflects how we structure these projects. SPYS Designs sits at the center of the team, not because we are managing the contractor, but because we are the party responsible for making sure the sound isolation design intent survives contact with every other scope on the project.   THE HVAC PROBLEM Three Decisions That Could Not Wait This room is a second-floor dedicated listening room. No windows by design. Six occupants at full listening sessions. A 7.1.4 immersive speaker system and a separate two-channel reference system. That is a real thermal and humidity load in a demanding climate, and every HVAC decision on this project has direct consequences for acoustic performance. Before the coordination meeting, we had to answer three questions that every other party was waiting on: Dedicated mini split or whole-house tie-in? Tying a 291 SF listening room into the whole-house system creates capacity problems, noise transmission risks, and removes independent humidity control. We recommended a dedicated ductless heat pump inside the isolation envelope. Dedicated ERV or whole-house ventilation? Six occupants in a sealed room require controlled fresh air. A whole-house ERV cannot reliably serve a room with this acoustic sealing requirement. We specified a dedicated ERV crossing the envelope through acoustic baffle boxes. Dedicated dehumidifier or whole-house system? Houston’s latent loads are severe, and the sensible heat ratio of this room is too low for a conventional cooling unit to hold 50% RH without short-cycling. Dehumidification is decoupled from cooling entirely via a dedicated ducted dehumidifier in the mechanical room.   Each of those decisions has downstream consequences for the structural engineer, the builder, the HVAC contractor, and the acoustic design team. None of them can proceed until those decisions are on paper.     The result is four ceiling-mounted acoustic baffle boxes — two for the ERV loop, two for the dehumidifier loop — each sized to keep air velocity at or below 150 feet per minute. That is half our acoustic design ceiling for duct velocity. The boxes had to be coordinated with the ceiling joist framing, the structural review, and the ceiling cloud layout from the acoustic design team. All of that coordination happened on paper before the meeting.   THE BRIEF How to Run a Coordination Meeting That Goes Smoothly Before the coordination call, we issued a written design basis document to the full team: the mechanical engineer, the builder, and the architect. It covered the Manual J load calculation, the selected HVAC architecture, the equipment schedule, and the baffle box sizing. Nobody walked into that meeting cold.       A contractor quotes what they know to quote. A construction document set specifies what they do not know to ask about. The meeting ran cleanly because the decisions had already been made on paper and the logic was documented. What could have been a debate about HVAC architecture became a confirmation call. Every party read the brief, agreed with the logic, and left with clear scope. After the call we issued the HVAC decision sheet to the full team so each party could review it with their own people and confirm alignment. That document becomes part of the coordination record for the project. If anyone has a question during construction about why a baffle box is located where it is or sized the way it is, the answer is already written down.   WHERE THIS FITS Phase 2: Making the Project Priceable and Buildable     This HVAC coordination work sits entirely in Phase 2 of our process: bid-ready production. Wall assemblies, HVAC intent, contractor drawings. The goal of Phase 2 is to produce a document set that every party on the project can price from and build from with confidence. By the time we reach Phase 3 — controlled revisions and finalization — there are no open HVAC questions. The builder is not figuring out where the baffle boxes go during framing. The HVAC contractor is not guessing at duct sizing in the field. The structural engineer has already confirmed the ceiling joist coordination. We also had to coordinate our baffle box locations with the ceiling cloud layout from the acoustic design team. The acoustic treatment geometry and our penetration locations had to be resolved at the desk, not on site. That is a drawing coordination problem, and it belongs in Phase 2.     When the walls close, the team reads the plans and builds what is specified. That is the standard.   THE STANDARD If the Room Has to Perform, the Details Are Not Optional A show house listening room at this level requires a sound isolation designer who can coordinate five professional teams, document every HVAC decision before the first meeting, and produce a set of construction documents that every party can build from without ambiguity. The details we covered in this article — the HVAC architecture decisions, the baffle box sizing, the coordination brief, the decision sheet — are not optional considerations on a project like this. They are the difference between a room that works and one that does not. That is the standard we hold at SPYS Designs.   Planning a room that has to perform at this level? The decisions that determine whether your room works or doesn't get made long before construction begins. Start with a Sound Isolation Site Assessment. Take your sound isolation assessment

  6. 22 juin

    The HVAC Problem Your Architect Isn't Solving (And Why It Kills Studio Builds)

    SOUND ISOLATION DESIGN  ·  SPYS DESIGNS The HVAC Coordination Gap That Quietly Ruins ADU Studio Builds When an architect designs the roof, a contractor quotes the equipment, and no one is responsible for the acoustic result, the room fails in the field, where it is most expensive to fix. Here is what it looks like to close that gap before framing starts.     Right now we have two ADU studio projects running at the same time. Different clients, different states, different architects. Both of them hit the same wall this week, and it is the same wall almost every high-performance ADU build runs into eventually. The architect designed a roof system. The HVAC contractor had equipment to quote. And no one in the room had worked out whether any of it would function together once you add the one requirement that changes everything: this room has to be acoustically silent. That intersection, where structure, mechanical systems, and acoustic performance all have to resolve at once, is nobody’s job by default. It becomes a problem only when someone is specifically hired to own it. What follows is an account of what owning it looked like on one of those projects. The gap nobody owns An ADU at this scope requires an architect. The architect is responsible for the structure and the way the building looks. They draw a roof system that carries load, meets code, and fits the aesthetic the client signed off on. The HVAC contractor comes in later and quotes equipment they know how to install. In a standard attic, that is a routine job. They size the system, run the ducting, and move on. Neither of those professionals is designing for acoustic performance. Neither is thinking about whether a silent ventilation system, with its baffle boxes and oversized ducting, will physically fit inside a roof structure that has already been drawn. The client assumes someone is coordinating all of this. In most builds, no one is. That is where the room quietly fails. The contractor installs what fits the space rather than what performs, the client never learns what they lost, and the room ends up louder than it should have been for the rest of its life and regrets not having done it “right” the first time.  The constraint stack On this project, the architect had specified a roof framed with trusses. Trusses are cheaper and faster to frame, and for most builds they are the obvious choice. The problem is that trusses fill the attic with structural webbing. Once we mapped the baffle box geometry against that layout, there was no viable path for a silent HVAC system. The equipment simply had nowhere to live. So we made the call to move away from trusses and to traditional dimensional lumber framing. That decision came with a responsibility. Once you remove the engineered system the architect specified, you now own the structural recommendation that replaces it. We ran estimated structural calculations and proposed a specific framing approach: 2x8 rafters with 2x6 collar ties and a continuous 2x10 ridge beam, all at 16 inches on center. We also bumped the roof pitch up slightly, which improved the structural numbers and opened additional clearance in the attic. Then came the part that is genuinely interesting, and the part no architect or mechanical engineer would have caught. Our standard baffle box internal duct size for an ERV and dehumidifier system is twelve inches by twelve inches. We use that size because we know the air speed math works at that volume, and air speed is what keeps the ventilation silent. On this project, even after removing the trusses, a 12x12 box would not fit inside the available structure. The intuitive solution would be to shrink the box. But shrinking it changes the internal volume, which changes the air speed, which compromises the acoustic performance. So instead of shrinking it, we re-proportioned it. We tested a series of baffle box geometries that all held the same internal volume as a 12x12, and landed on a box with a lower profile and a much wider footprint. Same cubic volume. Same air speed. Same acoustic result. It just fit inside the roof the architect had drawn. That is a mechanical engineering decision disguised as a geometry problem, and it is exactly the kind of thing that falls through the cracks when no one owns the intersection.       What the architect said When the framing recommendation was ready, we sent it to the architect of record for review. This is not a normal deliverable from a sound isolation firm. A consultant does not typically hand an architect a structural framing proposal and ask them to confirm it. The response came back the same morning. Four minutes between the two emails.         The phrase that matters is in the second email: the plan is in-line and not over-engineered. That is professional shorthand from one design professional to another. It means we understood the structural situation, proposed exactly what it required, and did not pad it with unnecessary material. Coming from the architect of record, it is the kind of validation a firm cannot give itself.     The drawing above is what existed before a single framing member went up. Baffle box openings, duct routing and sizing, ERV and dehumidifier locations, supply and return runs. All of it was resolved on paper, in coordination with the architect, while changes still cost nothing. The pattern We have two of these running right now, same problem, same week. That should tell you this is not a rare edge case. Any ADU with an attic HVAC requirement and a real performance specification is going to create this coordination problem. The only question is when it gets solved. In the design phase, where a re-proportioned baffle box is a five-minute decision on a drawing. Or in the field, where the framing crew makes the call for you, and the acoustic performance of the room pays for it.   If you are planning a room that has to perform at this level, the details above are not optional considerations. They are the difference between a room that works and one that does not.    If you are planning an ADU in your backyard or a recording studio in a basement or garage the first step is to make sure you have the right site. That is exactly what the Soundproof Site Assessment was designed to do. Learn more at the link below.  Get your Soundproof Site Assessment  soundproofyourstudio.com/plan

  7. 15 juin

    Why I Talk Most Clients Out of Custom Built-In Acoustic Treatment

    There is a version of the dream studio that serious builders have seen in magazines, on YouTube, and in commercial facility tours. Floor to ceiling fabric-wrapped panels, integrated diffuser arrays, custom millwork that signals the room was designed with intention. It looks like a finished, professional space. It looks like it performs better than anything with panels hanging on a wall. In my latest video, I make the case that for most residential clients, pursuing that look is a financial mistake. Not an acoustic mistake. A financial one. And there is a meaningful difference between those two things. The Physics Does Not Change Before getting into the cost argument, the acoustic reality needs to be clear. The absorption coefficient of a two-inch panel filled with 703 fiberglass does not change because a finish carpenter built the frame around it. A panel from GIK Acoustics or Music City Acoustics filled with the correct material and placed correctly in the room performs identically to a custom built-in panel filled with the same material placed in the same location. What determines acoustic performance is the material inside the treatment and where it lives in the room. Both of those are design decisions. Neither of them is a carpentry decision. The one honest exception is diffusion. A well-designed quadratic residue diffuser requires precise geometry to scatter sound correctly, and custom woodwork is sometimes the right solution there. But broadband absorption, which accounts for the majority of what most rooms require, is physics that does not care about aesthetics. This is the foundation of the argument. The performance outcome is essentially identical. Everything else is a question of capital allocation.   Three Reasons We Almost Always Recommend Freestanding Panels Reason One: You Have Already Lost Enough Space Sound isolation construction is inherently space-consuming. A properly built room within a room, with double-wall construction, decoupling, and appropriate mass, costs you anywhere from four to eight inches on every wall before you have placed a single piece of acoustic treatment. In a twelve by fourteen room, that is not a trivial number. Adding built-in acoustic treatment on top of that construction means losing another four inches of depth on the walls you are treating. Freestanding panels sit against the finished wall surface and add minimal depth. The room stays as large as you built it. For most residential clients working within a fixed footprint, that space belongs to the room. Reason Two: You Are Probably Going to Sell the House Most residential studio clients are building in homes they intend to sell at some point. A floor to ceiling custom acoustic treatment installation will be ripped out by the next buyer. It does not improve appraised value. It does not appeal to a general real estate market. From the perspective of a future buyer who is not a recording engineer, it is an obstacle rather than an amenity. Freestanding panels are furniture. They leave with you when you sell. The room sells as a room. This is a point that rarely comes up in studio design conversations, and it should come up in every one. Reason Three: Portability Compounds Over a Lifetime This is the argument I feel most personally. I have approximately $6,700 invested in acoustic treatment that has followed me across multiple studios over the course of my career. When I sell my current home and build my next room, that investment moves with me. The panels I specified and purchased for one room become the treatment package for the next room at zero additional cost. Custom built-in acoustics depreciates to zero at the point of sale. You leave it behind, the new owner tears it out, and you start over. Freestanding panels compound. You pay for them once and they follow you indefinitely. For a client spending five to ten thousand dollars on a treatment package, this is not a small consideration. It is effectively the difference between a capital investment and an operating expense.  A recent commercial project where custom built-in acoustics was the right solution. When Custom Built-In Acoustics Is Actually the Right Answer The argument above is not that custom treatment is wrong. It is that the conditions that make it the right answer are specific, and they apply to a minority of the projects we work on. We recently completed a commercial studio project where the client's situation met every condition that justifies custom acoustics. It was a commercial application with no resale consideration. The client had access to skilled woodworking fabrication at a significantly reduced cost relative to hiring a finish carpenter at market rate. The studio needed to make a statement aesthetically and functionally. And the client understood clearly that the premium above freestanding panels was an interior design investment, not an acoustic investment. That combination of conditions is what made it the right call. When we can separate the aesthetic budget from the acoustic budget, and the client is clear-eyed about what each line item is buying, there is nothing wrong with a beautiful room. The problem arises when custom acoustics gets funded from the acoustic budget under the assumption that it produces better acoustic performance. It does not. It produces better aesthetics. Those are two different outcomes and they should never share a budget line. What Our Deliverable Actually Includes When SPYS Designs produces a construction document set for a sound isolated room, the acoustic treatment specification is part of that deliverable. We model the room, identify the treatment targets, and specify which panels, in which configurations, at which locations in the room. The client does not have to figure out what to buy or where to put it. The result is a designed acoustic outcome that performs at a professional level, using freestanding panels that the client owns, can take with them, and never has to pay for again. That is a different value proposition than a designer who is selling you a beautiful room. We are selling a room that works. The look is a decision you make after the performance is locked in. If you are currently planning a sound isolated room and working through the acoustic treatment question, the Soundproof Site Assessment is the right starting point. We will look at your space, your budget, and your goals and tell you exactly what the room requires. Take Your Soundproof Site Assessment I'm Wilson Harwood, Sound Isolation Designer and Principal of SPYS Designs. We design sound isolated rooms all over North America.

  8. 8 juin

    Converting a Two-Car Garage Into a Recording Studio - The Complete Plan Set

    SOUND ISOLATION DESIGN  ·  SPYS DESIGNS We Just Finished the Plans for His Garage Recording Studio. Here Is What We Had to Solve. A detached two-car garage in California. A vintage guitar collection. A client who knew exactly what he wanted. This is what a complete sound isolation plan set has to account for.       The Garage Already Had One Advantage Most detached garages in California are built with stucco exteriors. That is not an accident of aesthetics. Stucco is dense, it bonds tightly to the structure, and it adds meaningful mass to the exterior shell before a single interior wall assembly goes in. When we started this project, the stucco was the one thing already working in our favor. Everything else was a raw shell. No insulation, no finished interior walls, no assumption of continuity or airtightness anywhere. A two-car detached garage is essentially a box with a large opening on one end and a handful of penetrations the original builder never thought twice about. Converting that into a high-performance sound-isolated room requires solving problems the original structure was never designed to consider. The client in this project is a serious collector. He owns approximately 50 vintage electric guitars, and those instruments need to live in a controlled environment. Humidity and temperature stability were not optional features for this room. They were functional requirements that shaped every system decision from day one. We recently completed the full construction document set for this project. What follows is a walkthrough of four specific problems the documents had to solve, and what happens to the build if any of them are left unaddressed.   The Structural Engineering Callout Here is a detail that surprises most people who have not built a sound-isolated room before. A standard residential garage ceiling is not engineered to carry the dead load of a real ceiling assembly. When you build a sound-isolated ceiling, you are adding substantial weight to a structure that was designed to hold almost nothing overhead. Engineered trusses in a residential garage are sized for a specific load calculation. That calculation did not include layers of drywall, resilient mounts, decoupled framing, and everything else that goes into a ceiling system designed to actually perform. Our construction documents include a specific callout directing the contractor to have a structural engineer review the existing truss system before any ceiling work begins. The engineer needs to verify that the trusses can carry the dead load of the proposed ceiling assembly, and sign off before a single hanger goes in. A contractor who has never built a sound-isolated room would frame that ceiling and never ask the question. The callout in the document makes it impossible to miss. This is not a theoretical concern. If the trusses are undersized for the load and the ceiling goes in without verification, you are looking at either a structural failure during the build or a failed inspection after it. The callout costs nothing to include. Skipping it costs everything if it surfaces at the wrong moment.    The structural engineering callout as it appears in the construction documents. The Electrical and Low-Voltage System This was the most technically complex section of the entire document set. The client had specific requirements for how his room needed to function, and those requirements created a wiring challenge that had to be fully resolved in the documents before an electrician ever showed up on site. The Power Side Every piece of audio equipment in this room sits on its own dedicated audio circuit. That is not a preference. It is a specification. Shared circuits create noise, ground loops, and interference that degrade the listening environment regardless of how well the room is isolated acoustically. We also maintain a minimum separation of one foot between line voltage wiring and low-voltage wiring throughout the entire build. When those two systems run in parallel without separation, the line voltage induces noise into the low-voltage signal paths. That noise shows up as hum in headphones, interference on MIDI lines, and degraded signal quality on every input in the room. The document specifies where that separation is required and how it is maintained at every penetration point. The Low-Voltage System The client wanted a full professional-grade signal infrastructure built into the walls. That means MIDI in and out, XLR inputs for microphones, quarter-inch TRS inputs for instruments, and a complete headphone distribution system for tracking sessions. Every one of those signal paths needs to be routed through walls that are specifically engineered to have no penetrations. We solved this by running everything over Cat 6A shielded cable. Shielded cable matters in this context because the room also needs to control electromagnetic interference alongside acoustic isolation. An unshielded run picking up interference from nearby line voltage wiring creates a problem you cannot fix after the walls are closed. Explaining to an electrician how to route a system this complex through walls that are designed to have no penetrations is not something you figure out in the field. It has to be in the documents before anyone pulls a single wire. The routing callouts in these documents specify where every low-voltage run penetrates the isolation envelope, how those penetrations are detailed to maintain continuity, and how the separation from line voltage is maintained throughout. An electrician working from a standard residential wiring diagram would not know to ask any of these questions. The documents answer them before the question can become a problem.     The electrical plan specifying dedicated audio circuits and Cat 6A shielded low-voltage routing. Moving the Baffle Box for the Car This is the most straightforward story in the set, and also the most human one. The initial design placed the HVAC baffle box in a position that worked well acoustically but would have blocked the client from parking his car underneath it. This is a two-car garage. He still uses it as a garage. That is a real constraint that the first version of the design did not fully account for. We moved it. What that sentence does not capture is what moving a baffle box actually requires in a document revision. The ceiling geometry changes. The HVAC coordination notes change. Any callouts that referenced the original position have to be updated. Every downstream document that touched that element gets a revision cloud. The plan set that went out to the contractor reflects the building the client is actually going to build, not an idealized version of it that ignores how he lives. The room has to work for the life the client is actually living, not a theoretical version of it. This revision also introduced something worth explaining to anyone considering a design engagement. A construction document set is not a finished product that gets handed over and locked. It is a living document. When field conditions surface something unexpected, when the client's requirements shift, or when a better solution emerges during the build, the documents get updated. The contractor always has a current set. Nothing goes to a bid or a permit application in a version that no longer reflects the actual project.     The baffle box location after revision to maintain vehicle clearance. Humidity Control for 50 Vintage Guitars A sound-isolated room is, by design, a sealed environment. That is exactly what you want for acoustic performance. It is also exactly the condition that causes humidity and temperature to drift without active management. For most clients, humidity control is a comfort feature. For this client, it is a preservation requirement. Fifty vintage electric guitars represent a significant investment, and those instruments are sensitive to humidity fluctuation. Swings in relative humidity cause finish checks, fret sprout, neck movement, and long-term structural damage to the instrument body. A room that performs acoustically but allows the environment to drift is not a functional room for this collection. The documents specify both an ERV and a dehumidifier as part of the mechanical system. The ERV handles fresh air exchange while maintaining the integrity of the isolation envelope. The dehumidifier provides active humidity control to keep the room within the range the instruments require. Both systems are integrated into the isolation design so that the penetrations they require do not compromise the performance the room was built to achieve. This is the intersection where sound isolation design and environmental design overlap. A contractor who has built standard recording studios but not designed for long-term instrument storage would not automatically coordinate those two requirements. The documents do it explicitly.   The mechanical specification integrating ERV and dehumidifier for humidity control. The Plan Set Is Done. The Project Is Not. When we deliver a completed construction document set, that is not the end of our involvement in the project. It is the beginning of the build phase. For this client, the next step is finding the right contractor. Not every client has one lined up. Some have never navigated a custom build of this complexity and do not know what questions to ask when they are evaluating candidates. We help with that. We can identify what experience a contractor needs to have, what to watch for in a bid, and what a qualified builder for a project like this looks like relative to a general contractor who has simply never encountered an isolation ceiling before. When the contractor starts work and finds something unexpected inside the walls or the roof structure, the document set does not become obsolete. We update it. A stucco exterior in California sometimes hides framing surprises. Engineered trusses so

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À propos

I teach you how to build a soundproof studio. Even if you know nothing about soundproofing or construction I go in depth to turn you from a total beginner into a soundproofing master.

Informations

  • Création
    Wilson Harwood
  • Années d’activité
    2022 - 2026
  • Épisodes
    230
  • Classification
    Tous publics
  • Site web de l’émission
    Soundproof Your Studio

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