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Old 12-15-2012, 05:18 PM   #1
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new skylight with eternabond ???

Sorry for bringing up a very discussed subject on Eternabond and skylights, but I have searched till I can't see straight... I have 4" eternabond tape ordered...(NOT double stick) Do I use that "under" the flange, or do I have to buy butyl (sp?) tape also ??? Geez, this is getting expensive.... I figure on using the 4" eternabond tape over the final flange/screws,,, right ??
Thanks, and I appologize for bringing up a well used subject. I just want to do it right the first time.
Monkey
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Old 12-15-2012, 05:49 PM   #2
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I recently installed a new skylight and here is what my rv tech said to do:

Scrape off old caulk.
Clean with alcohol.
Lay down butyl tape.
Install new skylight and screws.
Apply new caulk which came with skylight.
I didn't use eternabond tape.
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Old 12-15-2012, 05:57 PM   #3
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I replaced the 24 X 24 skylight over the bathroom of our motorhome about 3 years ago. I only used 3 screws per side thru the mounting flange of the skylight. I tightened the screws just enough to assure the flange was laying flat against the roof, then installed 4 inch Eternabond over the screws and the seam between the skylight and the roof. It is important that the roof is clean and smooth where the tape is to adhere to. I cleaned ours with alcohol and a cotton rag. Our roof is fiberglass. I would think, but am not certain that a rubber roof installation would be similar.
Pay extra attention where the tape side strips meet the end strips to make sure there is no gap between the two. You could use some extra sealant of some sort (Dicor) there if you want. Mine has been leak free since installation.
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Old 12-15-2012, 06:20 PM   #4
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Quote:
Originally Posted by dieselclacker View Post
I replaced the 24 X 24 skylight over the bathroom of our motorhome about 3 years ago. I only used 3 screws per side thru the mounting flange of the skylight. I tightened the screws just enough to assure the flange was laying flat against the roof, then installed 4 inch Eternabond over the screws and the seam between the skylight and the roof. It is important that the roof is clean and smooth where the tape is to adhere to. I cleaned ours with alcohol and a cotton rag. Our roof is fiberglass. I would think, but am not certain that a rubber roof installation would be similar.
Pay extra attention where the tape side strips meet the end strips to make sure there is no gap between the two. You could use some extra sealant of some sort (Dicor) there if you want. Mine has been leak free since installation.
So I take it you put the skylight directly on the fiberglass roof ? Ours is also fiberglass... I removed 34 screws from the original... Thankyou VERY much for the reply, that's the kind of info I was looking for !!!
Rockman, our skylight came with no sealant, but thank you...
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Old 12-15-2012, 09:30 PM   #5
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Quote:
Originally Posted by monkey View Post
So I take it you put the skylight directly on the fiberglass roof ? Ours is also fiberglass... I removed 34 screws from the original... Thankyou VERY much for the reply, that's the kind of info I was looking for !!!
Rockman, our skylight came with no sealant, but thank you...

monkey,

Yes I installed it directly to cleaned fiberglass roof. You can put down a small bead of Dicor self leveling caulk under the flange of the skylight if your leery of just using the tape alone. I didn't put all the screws back in, because my original skylight had several vertical cracks that started at the screw holes in the flange. I also, as stated, did not tighten the few screws that I did put in with much force.

Make sure there are no air bubbles under the tape when you are putting it down, and get it where you want it on the first try, as it does not want to move after it is down!
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Old 12-17-2012, 11:30 AM   #6
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Quote:
Originally Posted by dieselclacker View Post
monkey,

Yes I installed it directly to cleaned fiberglass roof. You can put down a small bead of Dicor self leveling caulk under the flange of the skylight if your leery of just using the tape alone. I didn't put all the screws back in, because my original skylight had several vertical cracks that started at the screw holes in the flange. I also, as stated, did not tighten the few screws that I did put in with much force.

Make sure there are no air bubbles under the tape when you are putting it down, and get it where you want it on the first try, as it does not want to move after it is down!
Thankyou sir... That helps a lot !!!
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