bpmcgee
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Post by bpmcgee on Aug 17, 2015 6:13:12 GMT -8
I know to use butyl tape for metal to metal joints where there's wood backing to provide the clamping force necessary to compress the butyl.
I've got a roof joint that's been added at a location where there's no stud behind it. I plan to replace the roof, but not this year. This means that I have to get that joint water tight enough to keep water out this winter. Is the clamping force of sheet metal screws enough to compress and seal the butyl, or is there something else I should get? The overlap, by the way, is several inches.
Brian
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Ten
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70 Shasta 16SC + 1964 Airflyte
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Post by Ten on Aug 17, 2015 12:14:51 GMT -8
I am only spitballin' here... this is all just guesswork and what we called back home, "by guess and by gawd"... I'm going to say that the tendency is to over-torque screws, especially where they are holding aluminum to aluminum. Backing would be nice but with the lack of any, the joint has to be fastened somehow... So, if it is already going to be screwed together as a means of jointing it, putty tape will certainly not HURT anything, and especially if it is the really sticky butyl tape. That stuff will hang on until 2050 with NO screws. And there is always caulk....
Here would be my suggestion...lay down a strip of butyl tape, perhaps even two strips wide if space allows. Then lay down a bead of the OSI clear micro Gutter Seal. No silicone though. (The Gutter Seal comes in a "caulk tube" so you can feel like you are cheating...) The clear MicroSeal won't harden up but does dry to the touch, so it stays somewhat flexible. Screw the joint firmly together and let it cure for a day or so (under cover if possible so as not to catch any rain that wanders through). See how that looks to you, and if there seems to be a need, you can run a final bead of the clear Gutter Seal across the joint. IMHO this should seal it up pretty well, and especially since the replacement roof is already in your plans.
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turbodaddy
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17' 1965 Fan "Sunseeker"
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Post by turbodaddy on Aug 17, 2015 19:21:14 GMT -8
Honestly, I do not have any affiliation with the manufacturer of "Eternabond" tape.
This sounds like a perfect application for it. VIKX says it only lasted for SIX YEARS in their case. Jeez,I hope I'll still be alive in 6 years!
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bpmcgee
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Post by bpmcgee on Aug 18, 2015 5:07:15 GMT -8
Thanks for the suggestions guys!
B
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Post by bigbill on Aug 18, 2015 7:55:29 GMT -8
pop rivets might work better than screws. then put a dab of gutter seal over each rivet.
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