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Old 08-26-2019, 05:18 PM   #1
Senior Member
Join Date: Aug 2016
Posts: 106
Roof caulk

I have a 2016 FR Sierra 377FLIK 5th wheel.
I can't find info from purchase about what type of roof this is .
It looks light beige and thin.
I want to caulk seams at front and back and it looks like original is self-leveling caulk (dicor?).
Anyone knowing there's a better product?

2016 FR Sierra 377FLIK
2016 GMC Sierra 2500HD Diesel
ktvaughan is offline   Reply With Quote
Old 08-27-2019, 11:48 AM   #2
Head Rambler
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 7,224
The better product is Eternabond tape.

Your roof should be TPO, but you can contact Sierra division to make sure. Also the owners manual is online for that year.

If you don't want to use Eternabond then Dicor self-leveling sealant is the product to use on the horizontal surfaces.

Salem 29RKSS Pushing a GMC Sierra 2500HD!
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Old 09-30-2019, 06:27 PM   #3
Join Date: Aug 2008
Posts: 46
I use Dicor tan, matches great, works great.
mrwoodmin is offline   Reply With Quote
Old 09-30-2019, 06:38 PM   #4
Pickin', Campin', Mason
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Join Date: Aug 2015
Location: South Western PA
Posts: 11,174
I would want to know for sure what roof membrane you actually have before making a suggestion.

There have been reports of the ALPHA TPO membrane wrinkling when using Dicor products to seal.

You should have received paperwork noting the manufacturer since many of these membrane roofs have multi-year prorated warranties. (often as long as ten years)
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
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caulk, roo, roof

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