Their picture is terrible so this is a picture from Home Depot : I am using 2'x12' galvanized metal corrugated roofing panels from Home Depot. I priced materials and I am going with a combination from Lowes and Home Depot. I put the joists 4' OC with perpendicular blocking spaced 2' OC. We burned about 3 1/2 last year (first year in house) so I'll have 2 years stored with a little margin. If I stack 6' high I'll have 9 cords under cover. My shed will have a covered area that is 24'x8' with a 2' overhang for a 28'x12' roof. If this ever happen under a woodshed it wouldn't be a big deal. Under the right moist and cool weather conditions I have seen water condensate on the bottom of bare metal roofing and watched it rain under the roof as it warmed up and the sun hit the metal roof. ,ĮDIT For anything but a woodshed I would still put felt paper or some membrane on the strapping directly under the metal. It makes it a lot easier to put the screws in once you get the sheets up on the roof. Just make sure the metal roofing is all stacked exactly on top of each other figure out exactly where the screw holes need to be to line up with the strapping and drill the holes through all the sheets at once. One trick you can use for helping the metal roofing go on way faster and easier is to pre-drill the screw holes while the metal roofing is still in a stack. You'll save some $$$ using 1x4s over 2x4s. I can't see any advantage to using 2x4s for strapping unless your rafters are further apart then 24". For metal roofing rafters 24" on center with 1x4 strapping (purlins) is pretty standard around here, with the strapping 16" on center.
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