Adhering XPS foam to plywood
I have built a double stud wall with plywood window bucks. I will be adding 2″ XPS foam on the inside of the window buck. How would you adhere the XPS to the plywood?
Metal fasteners through foam ( minimally ) defeats the purpose of the foam.
Some adhesives will hold the foam off of the plywood. Think how drywall adhesive leaves a gap.
Some adhesives may melt the foam.
What would you do?
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