Sub-Slab Insulation and Seismic Performance
Does anyone know of how insulation under a slab affects seismic performance? And has anyone found any resources comparing different material choices, e.g. foam types compared, or foam vs glavel, etc.
I tried searching a bit before asking and I could only find a few papers and one article about a development forgoing sub slab insulation in California because the engineer wasn’t comfortable with it. There was one paper that discussed a theoretical application where a slippery layer was installed between the two layers of foam and horizontal stops were added at the edges so the whole slab could slide back and forth, but they didn’t do any testing.
There was one paper that modeled XPS but its basic conclusion was “it shouldn’t be a problem but we need field studies”.
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