Forum Discussion

The_Titan's avatar
The_Titan
Explorer
Sep 02, 2016

Roof leak around air conditioner

I suspect my air conditioner roof gasket is leaking, instead of replacing it I hope to caulk around it. My questions are, what kinds of caulk are compatible with TPO roofs and if I should have to replace the gasket, at a later date, will I be able to clean the caulk off the roof? I have been around long enough to know that patch up repairs rarely are a good idea, but in this case I want to try anyway.
  • wildtoad's avatar
    wildtoad
    Explorer II
    Sep 02, 2016
    Do not caulk it, take the time and effort to remove the old and put on the new. The po of one of the used units I bought caulked and it still leaked and caused a real mess. Have you tried just tightening the mounting bolts and compressing the current gasket more?
  • turbojimmy's avatar
    turbojimmy
    Explorer
    Sep 02, 2016
    The only way to do it right is to remove the A/C unit, and if you're going to do that you may as well replace the $20 gasket. If you try to caulk around it you'll just make a mess (BTDT).

    But if you insist, I'd use an interior/exterior type door & window caulk. I've used it before and it peels off easily - at least off of my old-school aluminum roof.

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