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Most snap lock panels, especially with seam heights of 1.75" or more, are approved by their manufacturers for 2:12 pitch. One thing that is always important to look at is the rafter length. Also, the roof complexity and where water is being directed. I'd be happy to take a glance at these things for you if you wish to send plans to me at todd@asktoddmiller.com
I'm planning on a 12" aluminum standing seam on a 2:12. Do I have to use a mechanically seamed product, or can I use ClickLock? (please say Clicklock...). I live in central Alabama, so snow/ice is not a problem, but my builder is less than familiar with aluminum roofing, which I absolutely want for it's UV-reflecting properties.
Rafter length = 27 feet on one side, 15 feet on the other.
Roof complexity = EASY! On one side of the house is a long shed roof that overhangs 2 ft. above a clerestory wall. The 2nd shed roof begins at the bottom of the clerestory wall and runs 15 ft. (which includes another 2-ft. overhang).
Will I need peel-and-stick ice/water shield under this 2:12, or is the plywood decking, rafters 16" on center, and a synthetic underlayment acceptable? In central Alabama ice certainly isn't a problem.
Water is directed to the left and right sides of the house since the roof was designed with the water run-off issue from the back of the lot in mind; the lot is long and narrow, with a slope of approximately 25 degrees), so the roof was designed to keep any additional water coming off the back of the house.
Ideally the plan (ok-- drawing) itself actually attached, but I'll also email them to the address you provided. link text
