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Old 03-08-2014, 01:16 PM   #1
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Replacing shower skylight, questions?

I have a 2006 Tiffin Allegro. I am going to replace the skylight over the shower. I have the new skylight an four tubes of self leveling lap sealant. Is there any item I need to seal down the skylight to insure that it is sealed properly? I am thinking all I need is to put a good amount of the self leveling lap sealant down and place the skylight on top of it. If you have done one I would like to hear your recommendations ofr the proper way to do it before I tear the skylight off. Thanks, John
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Old 03-08-2014, 02:05 PM   #2
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I use putty tape (suitable for your roof material), screw the skylight down compressing the putty, then seal everything with the sealant. Pictures showing this process can be reviewed in the reroof project link below. The use of different sealing methods provides multiple barriers to prevent water entry. Should one fail, supposedly the next barrier will still prevent water entry. Most joints have 2-3 sealing barriers.
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Old 03-08-2014, 02:05 PM   #3
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I am about to do the same. My plan is to remove the old skylight and clean the roof thoroughly. Drill holes about 2 inches apart - one inch from the edge of the skylight. Silicone inside the holes and place on roof. Screw down skylight. Cover screws with Eternabond tape that will wrap over to the roof about 2 inches.
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Old 03-08-2014, 04:45 PM   #4
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I replaced mine, it came with putty tape and about 12 Screws.
Puled off the cracked old one, cleaned off all the old goop with a putty knife.
Laid down the putty tape, set the new dome down, pressed into the putty tape,
Screwed the screws in cut the tip of the dicor sealant, laid about a 3/4 wide lip over
all edges, that covered the screws really nice, didn't touch it. Watched the sealant
Spread out looked good didn't need to touch up anywhere.
Do it on a warm day, the sealant will flow easier, it will look good when your done
Go for it & good luck

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Old 03-08-2014, 07:36 PM   #5
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2x what everyone is telling you
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Old 03-09-2014, 06:16 AM   #6
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Thanks for the good information. I have putty tape and the self leveling caulk. I haven't heard about using eternabond. I have a fiberglass rood. Do you think I need the eternabond, and will it work on a fiberglass roof? Thanks, John
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Old 03-09-2014, 08:11 AM   #7
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I used Eternabond tape Dicor sealant and only 4 screws per side when I replaced ours.

After removing the old skylight and thoroughly cleaning of the roof surface with alcholol, I layed down a bead of Dicor on the roof, imbedded the new skylight that I had already pre-drilled, installed the screws so that they were just snug. I then applied Eternabond over the screwed down lip around the entire perimeter of the skylight. I used 4 inch Eternabond, and overlapped the roof about 2 inches. I have replaced the skylight twice in the ten years since I purchased our Open Road.
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Old 03-09-2014, 02:42 PM   #8
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Eternabod is a real bear to remove I would just use dicor, why make more work down the road for the next guy?
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Old 03-09-2014, 02:52 PM   #9
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I have used, and always will, GE Silicone II for this purpose.
The original caulk from the manufacturer dries up and
cracks causing leaks. GE Silicone II has a 50 year life
expectancy. Yeah, it cost 7-8 bucks a tube but it's
worth it ! It is also used in construction as an adhesive.
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Old 03-10-2014, 07:37 AM   #10
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Eternabond releases very well when heat is applied with an electric heat gun.
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Old 03-10-2014, 07:59 AM   #11
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There is actually a special sealant available ... Surebond sb-140.

SUREBOND | SB-140 SKYLIGHT & WINDOW BUTYL SEALANT

BriRus SB140 Skylight Sealant : Amazon.com : Automotive
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Old 03-10-2014, 09:41 AM   #12
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Go to YouTube. Search RV skylight replacement. There is a video showing how to do it there. I was searching RV generator service and saw that someone had posted it.
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Old 03-10-2014, 11:30 AM   #13
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Quote:
Originally Posted by macandphyl View Post
I have used, and always will, GE Silicone II for this purpose.
The original caulk from the manufacturer dries up and
cracks causing leaks. GE Silicone II has a 50 year life
expectancy. Yeah, it cost 7-8 bucks a tube but it's
worth it ! It is also used in construction as an adhesive.

macandphyl
I respectfully disagree with the use of silicone caulk.

In my experience silicone caulk is not a good sealant over time, (especially on a RV roof).
Once silicone caulk has been used it is imposable to reseal anything properly unless all of the old silicone is completely removed....(nothing sticks to old silicone caulk, not even new silicone caulk)!

Both Dicor and Eternabond work best for me.

Mel
'96 Safari, 132k miles, (mine since '01)
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Old 03-10-2014, 02:40 PM   #14
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Quote:
Originally Posted by mel stuplich View Post
macandphyl
I respectfully disagree with the use of silicone caulk.

In my experience silicone caulk is not a good sealant over time, (especially on a RV roof).
Once silicone caulk has been used it is imposable to reseal anything properly unless all of the old silicone is completely removed....(nothing sticks to old silicone caulk, not even new silicone caulk)!

Both Dicor and Eternabond work best for me.

Mel
'96 Safari, 132k miles, (mine since '01)
Ditto ... I use inside my house on stuff I want to easily remove ... not on my RV.
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