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I just received some preliminary numbers for insulation on my home project. I told the insulation rep when he visited the job site about my plan for 2” XPS foam for under slab insulation for the radiant, and he was trying to convince me that spraying 2” of foam insulation would be rigid and about the same price. He just gave me numbers to spray 2” of closed cell foam on the floor and over the plumbing , which I’d staple the pex to. Has anyone ever done this? He claims it’s about the same price as getting the 2”xps foam board. I haven’t priced it out yet.