Roof delamination
I have an area in my rubber roof about 8" in diameter near the back of the roof grey tank vent that has a bubble in it. I made a 1 inch cut in the middle and the top 1/16" - 1/8" of the plywood is d...
Forum Discussion
hddecker wrote:
I would think that he did that so the epoxy didn't glue what ever he weighed it done with to the roof.
Look strange to have a fifty pound block of cement unuder the EPMD.
Yeah, well... Sounds like he glued 2 delaminated layers of ply together - the bottom intact one and the top one that delaminated from the bottom one, but was "stuck to EPDM".
And then put 50 lbs on wax paper on EPDM - this part makes some sense as you need a bit of pressure to keep 2 layers of ply together when they are warped.
The first part - filling the void with epoxy - doesn't sound like a good repair, it's more like a "sealing the rot". The top layer of ply had separated from the bottom for reason no other than rot. Solids turn into cr-p and emit gases that are pushing 2 layers apart. Other than cutting the whole area out, I don't know what would be the best method though. Boaters in such difficult places use some deep penetrating "Git Rot" - I suspect it's a kind of low-viscosity epoxy. A low-viscosity epoxy is a good thing anyway - like West System marine epoxy. A regular 1:1 epoxy from Home Depot would not be my choice here.
Btw, I'm surprised to hear about "plywood". Over the last decade or so manufacturers mostly have been using a lower grade product called OSB - oriented strand board. It can delaminate too, of course.
