At the recent 2018 RESNET Building Performance Conference, Jay Crandell (ARES Consulting) and Amy Schmidt (Dow Building and Construction) gave a presentation titled “Stranger Things – The Energy Code Myths that Haunt Us”.
The Applied Building Technology Group has developed a new tool to aid and simplify the design of code compliant steel stud walls.
Moisture vapor transmission and water resistive barriers are complicated topics. Below is a classic sketch of what can happen when sound science is not applied with respect to building construction and code compliance.
A misguided reliance on “breathing” or drying potential as the primary means to make a building’s wall work, without proper consideration of variations in conditions of use, can lead to the problem of wetting potential being too high when conditions of use change.
Given recent concern over combinations of foam plastic insulated sheathing (FPIS) with different types of cladding since the Grenfell Tower fire, it is worth taking a specific look at both the extent of cladding options available with FPIS and the important restrictions.
Despite being the perfect application of cladding, weather-resistant barrier (WRB), foam sheathing, air barriers, studs and so forth, the perfect wall is not necessarily the most practical or preferred solution for every building project.
One analytical tool that can help you consistently determine code compliance and reliable performance is the freely available wall calculator developed by the Applied Building Technology Group (ABTG).
This article provides an analysis of three equivalent wall assemblies from a thermal performance perspective that have very different insulation R-value specifications: R-20 + 0ci, R-13 + 5ci, and R-0 + 15ci.
To equate an R20 + 5ci wall to an R25 +0ci wall when building with steel would be a very serious error since the cavity insulation is only about 50% effective in a steel frame wall.
In recent years, concerns with the use of foam sheathing and termite infestation risk have seen heightened interest.