Does anyone know of any possible negative interactions between any kind of caulking and any type of foam insulation – either RFBI, sprayed, or even the canned stuff?
Will sprayed foam stick to caulking?
Thanks for any info!
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Replies
Bump
38 minutes.
Whew, bet Bob was sweatin' bullets he wasn't going to get a response :o)
u r not a feckless dastard
Edited 9/30/2005 11:21 am ET by rez
Well, here I am with not enough to do...
Watch out rez--kate is gunning for your "Official Bumper" position.Mike" I reject your reality and substitute my own"
Adam Savage---Mythbusters
I'd gladly pass the baton.
be heading for the refreshment stand
feckless dastards?
rez -
I couldn't possibly work up to your standard...I just happened by, & was interested in the answer, which I now have in spades!
Kate
every time I used polyurethane spray foam from a dispensing can, allowed it to cure, and then covered it with a polyurethane caulk, (Sika 1-A) the foam would react with the caulk and re-expand and bleed through the caulk.
switching to foam backer rods solved the problem
carpenter in transition
Thanks, Tim. I'll avoid the polyurethane caulk for this application. I've also heard butyl dissolves plastic like RFBI so I'll avoid that too. I'd like to use silicone or acrylic, but I'd like to hear that there are no compatibility issues first.
Bob, What is RFBI? Don't recognize the term.Acrylic latex caulk works well over fully cured polyurethane foam. Give it a day to cure out, longer if a very deep fill, or if very low humidity. Otherwise, the water in the caulk will cause the foam to swell as it completes its cure.Bill
Bill, I've only seen the RFBI term used here. Rigid Foam Board Insulation - like Styrofoam boards, thermax, etc.Good to know about the Acrylic Latex. Thanks.