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Adhesive for XPS foam insulation

Sawdust_Steve's picture

 I've salvaged a bunch of 3-inch XPS rigid insulation from a commercial re-roofing project (around 50 2ft x 8ft boards) and I'm using it to insulate my free standing garage. When I get to doing the hip roof I'd like to use some high grab adhesive that won’t require fastening of the boards to the roof deck.

Can anyone recommend a product that will grab enough so that I dont have to temporarily support the board while the glue dries?

Hey there Steve, I think the (post #216625, reply #1 of 7)

Hey there Steve, I think the PL formulated for foam has pretty fast grab.  Are you installing on top of the roof deck before finishing with shingles, or are you cutting to fit between the rafters on the underside of the roof deck?  

I'm cutting it to fit between (post #216625, reply #2 of 7)

I'm cutting it to fit between rafters. Have already finished two of the walls and am now moving onto the roof. I'm worried that the stuff formulated for foam doesnt have a quick enough grab and will let go and fall down. I guess that the best test is just to try.

Used to be, back in the stone (post #216625, reply #3 of 7)

Used to be, back in the stone age, you held up pieces of batt insulation with lengths of stiff steel wire, cut to length so they would jam between the joists.


Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

Well I'm not doing that if I (post #216625, reply #4 of 7)

Well I'm not doing that if I dont have to. Way too much work

Too much worki???  You (post #216625, reply #5 of 7)

Too much worki???  You pre-cut the wire pieces about half an inch "too long".  It takes all of about 10 seconds to jam one into place.


Of all the preposterous assumptions of humanity over humanity, nothing exceeds most of the criticisms made on the habits of the poor by the well-housed, well-warmed, and well-fed.  --Herman Melville

Hey Steve, we usually rip the (post #216625, reply #6 of 7)

Hey Steve, we usually rip the foam on the table saw for a friction fit.  If the panels don't stay up by themselves a half sunk hand nail into the side of the rafter on either side works too.  We can foam the panels' edges too after which helps hold them up.  

Thanks finefinish. I've been (post #216625, reply #7 of 7)

Thanks finefinish. I've been ripping on the table saw for the walls and it's working fairly well there. The roof is wider and the friction thing wont work.