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Old 05-10-2013, 10:02 AM   #1
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Sealing Front and Rear Cap

I was inspecting my EPDM roof yesterday and noticed some cracks in the roof lap sealant where the top front and rear caps meet the roof. I will need to reseal these areas.
Is it best to re-apply lap sealant to these areas or should I lay down a 4" strip of Eternabond tape over the area where the caps meet the roof?
If I do the tape, I would remove the existing sealant, however, I understand that this may not be as easy as it sounds.
What is the best method of sealing these areas? Lap sealant or tape?
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Old 05-10-2013, 10:29 AM   #2
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I clean the old sealant with mineral spirits, (apply to a rag and wipe, don't pour on the roof) and re-coat with the lap sealant. I usually check and re-coat annually. Using the Eternabond is a good alternative.
If using the tape, I would clean the old sealant and tape over. Some may disagree, but I used that method to seal around my skylight several years ago and it works fine. Digging out that sealant could result in gouging the rubber membrane...
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Old 05-10-2013, 11:15 AM   #3
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On inspection of my seams at the caps, I found multiple layers of self-leveling caulk, with the oldest cracked. I used a heat gun to soften and remove the caulk, acetone to clean up the seam, then applied 4" Eternabond tape.
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Old 05-10-2013, 11:46 AM   #4
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Heat and mineral spirits is the best for removal, It's not terribly hard.

I'm an Eternabond fan, but I would probably use EPDM roof caulk, or a combination of tape and caulk, in that situation. Get rid of the piled up old caulk and lay a nice new seam of self-leveling sealant, Dicor or Alpha EPDM type. You can layer Eternabond over that if you like.

I say that because I don't like the tape coming over the edge of the roof where it joins the sides. It shows, and doesn't always lie smooth. And if you have a compound curve there, as may often be the case on the rear cap, the tape won't lay completely flat and seal right, so you need caulk there anyway.
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Old 05-10-2013, 08:54 PM   #5
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Scrub the seam well and get all of the loose material off. Mineral spirits do not go well with a rubber roof. Once clean, apply either a 4" or 6" Eternabond tape.

Ken
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Old 05-10-2013, 09:09 PM   #6
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This may help.





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Old 05-10-2013, 09:30 PM   #7
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Quote:
Originally Posted by TXiceman View Post
Scrub the seam well and get all of the loose material off. Mineral spirits do not go well with a rubber roof. Once clean, apply either a 4" or 6" Eternabond tape.

Ken

x2 6 inch Eternabond is what I used.
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