Manufactures suggested spacing is every 18'; on every ridge.What is the correct spacing of screws to apply corrugated sheet metal roofing?
It really depends on how secure you want it. Is it going to be in an area of high winds...which can rip it off if not fastened down good. I have secured them with every other valley...and I have also gone every third valley. Just depends on what you want...and how much you have to spend on screws.
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