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Post Info TOPIC: Need advice on calking/sealing a skylight.


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Need advice on calking/sealing a skylight.


I have a steel roof with a skylight in one room.  The roof is leaking, and I believe it is coming from around the skylight.  I have had two roofers up there and each one has said he added caulk and cannot find anything that should be leaking.  The second one was the roofer who installed the steel roof about eight years ago.  I have read that one cannot add new silicone caulk over old silicone caulk and expect it to seal.  I plan to get up there next week if it doesn't rain and take a wire brush, and utility knifes and clean all of the old caulk from around the skylight.  I would like to know of any type of solvent that I might use to make sure all of the old caulk is removed.  Then I am going to reseal everthing I can find around the skylight.  I was thinking of using black mastic instead of caulk.  Does anyone have any comment on that, or any other suggestions for good long-lasting sealer?  Any advice would be greatly appreciated.



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Cullen J Waters


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First off  Jack,, welcome to the forum,, small group here , but we usually figure out how to fix things or really screw them up, so stick around and join in

If you are referring to a metal roof,  it could be leaking just about anywhere, and running to the sky lite before finding a place to drip, OR it certainly could be leaking around the edges of the sky lite,, is there any  vinyl flashing  around the sky lite to direct the water away from the edges where the roofing material meets the edges of the sky lite? ,and be glued down with roofing sealant,, if its screwed or nailed down thats where the leak is origionating

On the caulking part,, if its caulked with regular painters caulk, that won't work so well cause it shrinks and drys up and leaks,

roofing caulk is more a tar, asphalt. sticky mess,

usually black sealant in a tube,

 

 check this out

http://www.ehow.com/how_6311284_flash-skylight-metal-roof.html



 



-- Edited by Bad Rat on Saturday 30th of March 2013 01:10:41 AM

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welcome to the forum......

Rat is right....it could be leaking above the skylight and flashing, if there is any there. While you are up there, snap a couple of pictures and post them.

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First of all, welcome to the diverse world of Home Handyman.

As Bad Rad said, that leak may be coming from 'elsewhere' on that 'tin' roof. Without knowing that particular roof system, have to say my very small experience with them is a covered porch. The roofing panels are interlocked/overlapped then screwed down with a special sealing screw and neoprene gasket. If yours is like that one of them may have loosened or even come out.

Then, skylights - I love to hate them or vice versa.

A couple years ago I had my roof reshingled (there's a thread here on that) and the one skylight was supposed to have been reflashed - it wasn't, I found. OK, after about 6 months it started to leak. After a couple of attempts to fix, including once by the roofer, I went out, bought some special 4" wide fiberglass screening and some asphaltic sealant and did a complete job. I removed the window itself, then filled in the entire area around the frame with the screening and the sealant. I then installed some new closed cell strip seal on the actual frame to window interface. So far, two hurricanes with literally feet of rain, Irene and Sandy, plus 1-1/2 winters, no return of the leak. Eventually I would like to replace that skylight with a Velux and properly opening version along with their leak proof flashing system - but since I no longer have a leak, that priority has fallen - real low.



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welcome jack.im bettin its the flashin around that sky lite. i do mine myself. i got a way of flashin um so they cant leak. that caulk is not a fix on anything . its a bandaid. its gona be a job to fix it rite. you'll have to take some metal roof off to get to it good. pics allways help. welcome agin jack.

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Well, it turns out my 70 years old overweight butt ain't going up on that roof. cry I put a ladder up there the other day and found that my boots and sticky gloves would not even get me up the less steep grade, much less where it is steeper further up,  I was hoping to get high enough to throw a 1/2 inch nylon rope over the peak and tie it off to one of the columns that support my deck on the other side of the house, as a safety line.  This is not the kind of metal roof that we used to call a "tin" roof.  It does not have that corrugated look.  It is painted green and has ridges bent into the metal about every 8 or 10 inches.  I thought it only came in red  and green, turns out it also comes in blue. 

My original questions have not been answered; is there a solvent that will remove the old silicone caulk?

I agree that the stuff you use to seal roofs is black and messy.  It used to come in gallon size cans, was called black mastic, and you used a putty knife to apply it. 

imperial_rib_blue_panel_250px.png



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Cullen J Waters


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Jack1943

My original questions have not been answered; is there a solvent that will remove the old silicone caulk?

I agree that the stuff you use to seal roofs is black and messy.  It used to come in gallon size cans, was called black mastic, and you used a putty knife to apply it. 

imperial_rib_blue_panel_250px.png


 Woops,, sorry bout that,, think we got too tied up with the leak, insted of the caulk

Don't really know of any super way of getting the dried caulk removed, other than scraping off the majority of it and maybe using Acetone, of some stronger solvent based cleaner,, and a stiff wire brush

Hopefully it won't take the paint off the metal,, most likely the finish on the tin is powder coat,,

 

 Ya might try Goof off   http://www.goofoffstainremover.com/wheres-your-stain/metal-cleaning



 



-- Edited by Bad Rat on Wednesday 3rd of April 2013 09:25:47 AM

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