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Old 07-10-2008, 04:51 AM   #1
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I have to replace the skylight over the shower on the roof of our motorhome due to cracking. The roof is fiberglass, and the skylight is a plastic flange mount non opening type. What is the best caulk or sealant to use between the flange and the roof? It is attached with self tapping 1/4 inch hexhead screws. I would like to leave out most of the screws on re-installation, as the skylight seems to crack at every screwhole in the flange of the skylight. I am thinking maybe would last longer if only calk or sealant were used to attach. Maybe could expand and retract more?? Size is 23x23 inches.

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Old 07-10-2008, 04:51 AM   #2
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I have to replace the skylight over the shower on the roof of our motorhome due to cracking. The roof is fiberglass, and the skylight is a plastic flange mount non opening type. What is the best caulk or sealant to use between the flange and the roof? It is attached with self tapping 1/4 inch hexhead screws. I would like to leave out most of the screws on re-installation, as the skylight seems to crack at every screwhole in the flange of the skylight. I am thinking maybe would last longer if only calk or sealant were used to attach. Maybe could expand and retract more?? Size is 23x23 inches.

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Old 07-10-2008, 05:13 AM   #3
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Have you considered Eternabond tape. Several years ago on a 5ver, I replaced a non-opening cover that consistently leaked and used a small strip of butyl tape under the edge, new screws with small flat washers, and Eternabond tape. Good stuff and it ain't gonna come loose. The tape can be bought for a good price from the IRV2 Upgrades site http://www.rvupgradestore.com/
or this online store, http://www.bestmaterials.com/roof_repair.aspx Both offer good pricing and fast delivery. This info will also be beneficial if you make an OOPS with the tape. http://www.eternabond.com/bulletin/e...ond_remove.htm
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Old 07-11-2008, 02:20 AM   #4
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What ever you decide to use to seal the job, be sure not to use too large a diameter screw and do not over tighten them. This is what causes them to crack. Good luck and keep us posted.
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Old 07-11-2008, 11:07 AM   #5
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I replaced mine last year. I used a rolled putty type tape between the skylight and the roof. The used something called C-10 self leveling caulk gooped all over. So far, so good.
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Old 07-11-2008, 03:50 PM   #6
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If I am concerned about a leak I paint the area with cool seal. I had a 1988 MH I traded off last year, annually I painted the seams with cool seal, I never had a leak.
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Old 07-11-2008, 05:46 PM   #7
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I would go with the eternabond tape and then use self leveling Dicor for the flange end.
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Old 07-13-2008, 03:45 PM   #8
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Check a roofing supply business for Eternabond. I got a bigger roll for less than half what some RV supply sources quote.
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Old 07-20-2008, 08:04 PM   #9
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Hi Ho: I noticed when I replaced mine that the holes weren't exaxctly alligned and therefore the screws pressed against the skylight. I simply drilled out the holes until this was not the case. I also use a champfering bit to take off the sharp edge. So far no cracks, but it has been less than a year, so time will tell.
Good luck, Dirk
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