TPO roof

Jsuders04

Member
Joined
Aug 24, 2024
Messages
12
I have a 2025 Grand Design Transcend one. There is a small gap in the lap seal on the back near the bathroom. The gap is between the black metal lip that covers the edge of the corrugated metal back and the existing lap seal that is on the rear edge.

I want to touch it up. The touch up would not directly touch the TPO roof.

Question 1 - can I use liquid rubber (the type in a caulking tube) for this repair?

Question 2 - What lap seal brand/material is recommended for direct to TPO use?
 
Marine adhesive caulk over the top of Dicor and the TPO will make a very good seal. But if you find you can pull the Dicor off (needle nose pliers work well), do that and then apply sealant. You can certainly use more Dicor, but you've already experienced the problem with that product. Your choice. Either way, don't worry about getting it on the TPO membrane neither option will hurt it.

Also, do yourself a favor and check the roof corners to make sure the Dicor is adhering well into those gaps. It's notorious for leaking there. I always go around and pull the Dicor out when I first bring RVs home, and I seal it will with adhesive caulk.
 

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