7 Minutes of BS (#BuildingScience w/a BEAT‪)‬ ProTradeCraft.com

Dr. Joe Lstiburek explains the fourth state of water: ADSORPED water. It exists on surfaces as tiny monolayers that can fill pores on the surface and cause mold. It also explains why expansive soils expand. If you thought you understood diffusion and capillarity, buckle up.

Vapor Diffusion Ports: Air Barriers That Let Moisture leave

Dr. Joe Lstiburek explains what Vapor Diffusion Ports are, how they work, why they're needed, and how to construct them—in about nine minutes.

The skinny version: they're like a modified ridge vent but for an unvented roof. They allow moisture to escape unvented roof assemblies without letting air leak out.

An overview of water, the liquid that makes life possible, rots buildings, and makes great wine.

In this episode, we are joined by Dr. Joe Lstiburek, out favorite crawlspace buddy, to talk about the origin of hot roof and cold roof labels.

This time on 7 Minutes of BS, Jonathan Smegal, M.S., describes his work at RDH Building Science Laboratories testing various wall sheathing materials for air tightness. The results are somewhat surprising but, truthfully, not a deal-breaker for most builders and remodelers.

Today's guest expert is Tanya Brown-Giammanco, formerly the Managing Director of Research at the Institute for Business and Home Safety (when we recorded this episode) and currently the Director of Disaster and Failure Studies at the National Institute of Standards and Technology (congratulations on the new gig, Tanya!).

Tanya explains how hail damage works, why hail damage matters, and how to minimize damage from hailstones by selecting the right roofing shingles.