Replies

1. Expert Member
   BILL WICHERS | Sep 01, 2021 05:02pm | #1

   I would use a foam board adhesive like the one in Loctite's PL line (PL300). A lot adhesives will react with (chemically "melt") foam board, so you have to be careful what you use. You also need something fairly thick since you're trying to glue to a less than ideal surface here. Spray adhesives tend to be very thin, so they don't work well on very rough and irregular surfaces.

   Bill

2. 
   user-2310254 | Sep 02, 2021 12:48pm | #2

   You might need to press the foam to the wall with some type of temporary brace while it is setting up. Or you could use a fastener such as https://www.trufastwalls.com/.

   Also see https://www.greenbuildingadvisor.com/article/fasteners-for-concrete-and-brick for more on fasteners.

3. 
   guillow | Sep 02, 2021 01:10pm | #3

   Thanks. It seems like the building science company created a nice document for the DOE, and they had recommended using a spray gun foam adhesive versus normal building adhesive. But I can't seem to find that easily.

   Is there significant difference in the building adhesives to the great stuff pro wall and floor spray adhesive?
   Rona.ca/en/spray-adhesive-751-g-56495022

   Def will be looking for using some kind of brace to get it set. Hopefully can find a good way to use some 2x4 and stubs to make a brace...