As if the spray foam industry didn't already have a dubious history with urea formaldahyde foam.
Spray foam ignition
Spray foam ignition
This foam ignited during the application process.Due to the combustible nature of the product, the new IBC requires all spray foam to be covered with a thermal barrier (gwb, plywood, etc.) even in attics and crawl spaces.
Josall, I don't like specifying the stuff for that reason. I can't imagine what it would cost to carve all this stuff out for some simple re-wiring.