Tried a foam roof coating on my Calgary bungalow last spring...

I was sure it would peel off after one freeze-thaw cycle, but it actually sealed three tiny cracks in my flat roof and held through that -40 snap in January, has anyone else had luck with that stuff or is mine just a fluke?

3 comments

3 Comments

caseythompson1mo ago

Bet on it being a fluke for a second, but then check what brand you used. I put that stuff on my garage roof two years ago and it's still holding up fine through every chinook and deep freeze. Most guys I know just slap it on and hope for the best, but the prep work matters way more than people think. You have to clean the area like it's about to get inspected, no dirt or moisture at all. Yours probably stuck because you took the time to do it right, and now you've got a patch that'll outlast the rest of the roof.

taraross1mo agoTop Commenter

@caseythompson you've got a good point about prep work. I had a similar situation with a flat section on my own house a few years back. Spent a whole Saturday scrubbing that area down with a stiff brush and some cleaner, let it dry in the sun for hours, then put on a quality roll on membrane. That patch is still going strong after three winters and a couple of hundred freeze thaw cycles. You're right that most guys skip the cleaning part and just smear it on, but that's why theirs fails in a season or two. Sounds like we both learned the hard way that patience pays off with roof repairs.

ryanm601mo ago

A buddy of mine did his shed roof the same way, scrubbed it down like he was prepping for surgery, and that patch has outlasted two cheap coatings he put on before. He said it was the first time he actually read the instructions all the way through instead of just skimming them.