Posted by kcm.MN on September 20, 2021 at 19:13:18 from (174.219.10.207):
In Reply to: Metal roofing posted by john in la on September 20, 2021 at 10:45:46:
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Makes sense to me. Larger buildings have larger areas, so more sun's heat likely to cause increased temps over a smaller roof?
I, too, have had to tarp items inside a wood-framed, steel covered pole building. Concrete slab. Ground stayed very dry even while raining. But the steel was simply spanning wooden support. Fast-changing temps would cause moisture in the air to condense on inside of roof and drip down. Only happened when conditions were right. Same thing happens, but is even worse with those tarp-like portable buildings.
I haven't seen a 'lot' of steel roofs up close and personal, but it seems that leakage comes primarily when the fasteners are not installed correctly. Too tight and the rubber washer gets compressed too much; becomes hard and brittle; won't expand when needed. Too loose and the opposite, plus the steel is loose and moves more due to wind; wallows out holes more.
I don't know what the comparison is between a roof where you can put fasteners literally anywhere vs. framing that is 2 or more feet apart. Maybe someone else here has the experience to answer that??
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