I’m putting a new front porch on my house and it appears that in order to maximize the depth of the porch that I’ll end up with something in between a 3/12 and a 4/12 shed roof. I know that because of wind concerns that this is not optimal however if you were to shingle a 3/12 roof what exposure would you use. I think I would use the selfstick icedam membrane stuff on the entire deck as a shingle underlayment. Other than that what other precautions would you take?
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Replies
Most laminated shingles (check with the manufacturer) allow you to install them on a 3/12, especially with ice barrier membrane underneath. Use the manufacturer's suggested exposure.
I think most regular shingles are speced for 3/12 if you use ice dam under them.
Open porch?
Asphalt shingles?
Don't even need the icea and water shield, unless you have a valley dumping tons of water in one spot where you might have snow drifts etc.
3/12 is the normal minimum and a porch would have no heat under it to cause ice damming so plain old 15# paper should be fine.
BTW, any asphlat shingle should be laid at the exposure it is designed for to get optimum sealdown effectiveness.
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Thanks for the replies. It will be an open porch with asphalt shingles.