Hello everyone, I have a quick question for everyone. We did a core sample on a flat roof showing the main deck having gypsum substrate on an older building. My question is has anyone else had the opportunity to EPS over a gypsum base before. Secondly, what adhesion system did you use to get your insulation to adhere? Thanks in advance, the forums are excellent.
Can't talk super intelligently because we don't use a lot of eps here in florida. But polyiso sticks to hard/dry gypsum very well in low rise insulation adhesive. therefore eps probably would too.
You may reach out to your manufacturer to see if they have a tested/approved assembly using eps over gypsum in low rise adhesive.
You should use olybond. On the poly iso. Wich is 2 separate liquids that join together then foam up. And you use a a gun that is like the caulk gun but with two barrel.
Contact your manufacturer and they should have the answers you need. I recommend a pull test for sure as more Manufacturer’s are fine with low rise foam to gym but they require a pull test.
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