[AT] Screwing roofing

[Len Rugen]

If the metal has "flats", I put the screws on the flats.  If it is the old
corriguated tin, I put them on the ridges.

I the metal that has the flats will deform if screwed on the ridges and
probably not seal, or for sure, look ugly.

I still remember killing my fingers driving the old lead headded nails thru
corrigated tin into old home sawn oak
purlins.

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