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local contractor will be installing a standing seam roof with either regular galvanized steel or galvalume. Does anybody have any experience with the galvalume, good ,bad or otherwise.The price is slightly higher, is it worth it? He said he runs a bead of silicon caulk along every seam prior to bending,said it prevents leaks in case of ice dams? Would it be wise to put the new membrane material on, from top to bottom before the steel?? I am in heavy snow area, no salt water.
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Galvalume is much better. I think it uses a mixture of zinc and aluminum to coat the steel.
I'm not sold on the use of caulk in combination with metal roofing however. Metal expands and contracts a lot, and needs the freedom to move. Sometimes 1 inch in 100 feet. I don't see the silicone remaining intact.
Am not familiar with the details of your installation, but have done design work on two or three large military retrofits using prepainted (with kynar) galvalume coilstock manufactured into standing seam panels.
*I use prepainted, preformed ribbed galvalume quite often for roofing...South eastern Ontario, where I buid, has its share of snow and my roofs haven't needed silicone (I echo Gary's thoughts there)or any membrane to be waterproof, or ice damn proof. But these are preformed panels, NOT bent and crimped on site!!! Minimum 6/12 pitch, ventilate underneath (regardless of other opinions on other roof designs)steel "sweats". If your doing cathedral ceilings I have a nifty method for insul. & vent.if you want it. It's lifespan is good. . . forever?
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local contractor will be installing a standing seam roof with either regular galvanized steel or galvalume. Does anybody have any experience with the galvalume, good ,bad or otherwise.The price is slightly higher, is it worth it? He said he runs a bead of silicon caulk along every seam prior to bending,said it prevents leaks in case of ice dams? Would it be wise to put the new membrane material on, from top to bottom before the steel?? I am in heavy snow area, no salt water.