That's a huge difference! What makes it worse is that this is the go-to wall type for 90% of the nonresidential projects I see in Southern California. ![]() However, they tend to be significantly different from the values provided in ASHRAE 90.1's Appendix A.įor a specific example that comes up all the time, consider a 2"圆" metal stud wall, 16" on center with R-19 batt insulation in the cavity. ![]() ![]() They are supposedly based on ASHRAE calculation methodologies. Title 24 (part 6), Reference Appendices, JA4 provides lookup tables for the performance properties of envelope construction assemblies. So this has been driving me nuts for a long time, and I thought I'd ping this community for feedback.
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