Published at Saturday, June 30th, 2018 - 19:59:31 PM. seam metal roof. By oska.
Excerpt from steel roofs for residential homes :
Expansion & contraction. Because metal expands and contracts as it warms and cools, most new products have fastening systems that accommodate movement; otherwise, fasteners that secure the roofing tend to come loose. Expansion and contraction on hot days can cause a wavy affect.
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