2x6s are plenty for your rafters. Most metal roofs on buildings are on wider spans such as 4ft. For metal you will have to use lathe ';2x4'; on 2 or 3ft center. This will add a lot of strength, then collar tie you rafters so your walls don't try to spread in the center and also keeps the roof from sagging through time and snow load. Since your building is only 16ft wide, your rafters wont be that long. A 5 or 6 ft collar tie should be plenty.I need some advice on building the roof for my shed.?
the 4 foot centers for the rafters would work but more importantly is the spacing of the purlins that would lay on the rafters for a metal roof panels.
see photo http://en.wikipedia.org/wiki/File:Cee-po鈥?/a>
this is metal construction in the photo but its the best i could find.
you would lay 2X4 purlins across the rafters to carry the metal roof panels at 16'; centers.
For a strong roof you need the cieling joists to be right at the top of the wall. If you don't want to do that, then you need to put a load bearing beam at the ridge to keep the roof from dropping and spreading the walls.
I just built a shed, put a Cedar Shake roof on it, with plenty of room for a loft for storage, I used 2x6 2 ft. on center with a 2x6 ridge beam
yes I have a 24 by 30 garage with 2 by 6 trusses on 4 ft centers with metal roof. hold up to 3ft of snow each winter. 4in12 pitch 5in 12 better
2 X 6 would be fine, but 2' on center and a pitch of no less than a 4/12. 16'; centers would be better.
If you're not sure on what you're doing I recommend you to use this for your shed
http://www.shedplansreview.com
That's what I used on mine.
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