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I am roofing a storage shed with 8’x2′ 5V crimp 26ga galvalume over 1/2 inch plywood sheathing, using galvanized screws with neoprene washers. What is the appropriate spacing for the screws? I have some 1.5 inch screws to penetrate the rafters when possible, and some 3/4 inch screws for any attachments between rafters.
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On 5-v we space 4' in the field and 2' on the rakes.
Use 30 lb. felt stapled down. Don't use simplex.
Screw on the flat and use galvalume screws not the galvanized which rust.
This roof will outlive you!
KK
*msK.K. and I have disagreed on this before, so here's the alternative position. 26 guage is amply strong enough to go on over skip sheathing (strapping) so pass on the plywood, use 1X4 skip sheathing on 24"o.c.. Screw through the ribs, not the pan. It'll not only outlive you but be cheaper and quicker!!!-pm
*Thanks for the advice. The sheathing was already up when I posted the question. I built a "chicken ladder" to help put up the galvalume. I wound up going with every 2 ft, since I had plenty of screws. The manufacturer's literature (Southeastern Metals) recommends attaching on the flat, so that's what I did, but I screwed the ridge cap on the ridges, with fitted foam pieces to seal the space under the cap.I had thought about buying 24 gauge instead of 26, but now I'm glad I didn't. It was hard enough to screw through the 26 gauge, and it seems fairly sturdy.After I finished, I toured the area to see what the standard practices are. Many of the roofs are indeed screwed on the ridge, with spacing as little as every six to eight inches. Seems like overkill to me.