Bonding roof decking
Hey All, 1990 class c 24' Tioga. I've removed the rotted luan and have the roof stripped down to the polystyrene insulation. There are steel rafters that run perpendicular to the length of the rig...
Forum Discussion
There are a few options off the top of my head.
Epoxy works fine on styrofoam, but is expensive and messy to work with.
Some polyurethane construction adhesives (the sort that you squirt out of a caulking gun) are safe for styrofoam panels. Consult the labels on the various products—while some are safe, others are not. PL Pro I think is one that is safe for styrofoam (at least some variants are), and it is very effective.
Some contact cements are safe for styrofoam. There are water-based contact cements that are safe, but I strongly recommend avoiding them, as (at least in my experience) they utterly fail at holding things together.
I would probably go for construction adhesive if I were in your shoes.
A related question that may be more difficult to resolve is figuring out how to keep sufficient contact between the luan and the foam to get a decent bond. I'm afraid I don't have many great ideas there.
(By the way, I would guess that your rafters may be aluminum, not steel. I could be wrong.)
Epoxy works fine on styrofoam, but is expensive and messy to work with.
Some polyurethane construction adhesives (the sort that you squirt out of a caulking gun) are safe for styrofoam panels. Consult the labels on the various products—while some are safe, others are not. PL Pro I think is one that is safe for styrofoam (at least some variants are), and it is very effective.
Some contact cements are safe for styrofoam. There are water-based contact cements that are safe, but I strongly recommend avoiding them, as (at least in my experience) they utterly fail at holding things together.
I would probably go for construction adhesive if I were in your shoes.
A related question that may be more difficult to resolve is figuring out how to keep sufficient contact between the luan and the foam to get a decent bond. I'm afraid I don't have many great ideas there.
(By the way, I would guess that your rafters may be aluminum, not steel. I could be wrong.)
