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My roofing supplier recommends they install a butyl sealant while rolling my snap lock panels. My roof pitch is 2:12.
Another well known roofing supplier tells me the sealant is not necessary.
In talking to a roofer who has been installing standing seam in a mountain resort town for 25+ years, he doesn't use it. He believes the peel and stick underlayment is good enough. He reports no problems. He recommended I follow the roofing suppliers recommendations....though, at the same time, points out that once I have the panels snapped down, the stickiness of the sealant won't allow the panels to be lifted.
That makes me nervous, being I have never installed this style of roofing before. It seems the sealant would make it even less forgiving of any mistakes I might make, requiring that I lift a panel for some reason.
If he can get away without using the sealant in an area that gets 3,4, and more feet of snow, why wouldn't I be fine in my area that rarely sees 6-8"? Maybe the difference for him is a higher roof pitch. He did not mention that though.
I am using Sharkskin Ultra SA as my underlayment.
As I recall, you also said you have a pretty long rafter length -- 34'. Yes, the low pitch is a factor. I have sold materials for plenty of snap lock jobs at 2:12 and with fairly long panels. That said, sealant in the female lock is a belt and suspenders approach and not a bad thing. If the contractor wants to do it, I would not turn them down. You are taking liability onto yourself if you refuse it.
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