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Old 02-13-2013, 06:18 AM   #1
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This is what I have to do (skylight)

how much do I trim and what do I seal this down with?
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Old 02-14-2013, 05:15 AM   #2
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I hate that the sewer and exhaust vents are so close. But first I have to find a garage to borrow.
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Old 02-16-2013, 12:59 PM   #3
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Are you putting in a new skylite or replacing existing lense?
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Old 02-17-2013, 07:36 AM   #4
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I am replacing the skylight tomorrow. the second picture is what Airstream sent me. I have most of the old the Eturnabond peeled off and would like to know what to put between the skylight and the roof. I was going to put dicore over the screwheads and edges. I hope it it works for the 2 other vents next to it.
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Old 02-17-2013, 01:47 PM   #5
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On my skylite the bathroom shower vent is close also. It looks like they positioned the lense and trim back around the vent for proper installation. I would put down Dicor sealing caulk first after cleaning off all former sealants and compress the lense into it. On mine they then used metal banding strips around the perimeter to screw down through to hold the lense in place.(I would pre-drill holes through the lense first before screwing through) Then recoat that with more sealant.Or in your case after it dries you could use the Eternabond tape again. On mine I used a couple coats Elastromeric sealer on top of all seams. Here are a couple pic's. Also I would follow Dave Massey's tip to tape off around skylite to make neater looking job. The caulking on mine is sloppy, but it doesn't leak and was that way when I purchased the coach.








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Old 02-17-2013, 04:21 PM   #6
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If it were me, I would pre-drill the holes around the perimeter of the skylight at about 1” from the edge and about 2" apart. Relieve any areas that interfered with vents (drill screw holes to accomedate for the relief) and then use butyl tape on the underside perimeter centered around the pre-drilled screw holes. I would then screw the skylight down through the butyl tape and then use eternabond tape around the perimeter. I know it wont leak then.

Just make sure you don't set the screws too tight as to crack the plastic. Using my method, the actual seal will be from the butyl tape and eternabond tape. Not the how hard you clamp the skylight. Butyl tape seals better over time as the bond improves the longer it sets.
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Old 02-17-2013, 06:18 PM   #7
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I might consider some type of nylon washer to spread the pressure out a bit with each screw. Those skylight crack with the slightest stress as can be verified by every post on the subject.

The only drawback would be more of a dimple under the eterna bond tape?????

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Old 02-18-2013, 06:41 AM   #8
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Use fender washers under each screw.
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Old 02-18-2013, 10:27 AM   #9
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Oh no! the PO used silicone to seal down the skylite. What should I do now?
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Old 02-18-2013, 10:36 AM   #10
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I think the only thing I have found to work on Silicone residue is WD40 and then final cleanup with Acetone.

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Old 02-18-2013, 11:01 AM   #11
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Here is what it looked like right after removal
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Old 02-18-2013, 11:17 AM   #12
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OUCH!! You have a mess to clean up for sure. Just make sure everything is clean down to the fiberglass with no residual silicone. WD40 and acetone should do the job but it's still going to take a fair amount of elbow grease before hand. Get as much of the stuff off with the scraper before you try using the chemicals. Nothing sticks to silicone and the chemicals tend to spread it around a bit until it’s all cleaned up. Not even Eternabond will stick to silicone. Once it’s mostly cleaned up with the scraper, use some sand paper to roughen it up and remove any of the remaining silicone glaze. Use the Wd40 to clean up any remaining residue and then the acetone as the final prep. The fiberglass should not feel at all slick when you're done.
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Old 02-18-2013, 12:04 PM   #13
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here are more pics
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Old 02-18-2013, 03:12 PM   #14
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Finished , What do you think?
I found some 3M adhesive remover which included silicone in the things it removed so I used that and a wire brush and followed up with acetone many times with clean rags. The screws I used were stitch screws for metal roofing that have a rubber washer under the head.
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