Minimum roof slope for asphalt shingled roof?

Old 11-18-07, 05:33 AM
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Minimum roof slope for asphalt shingled roof?

Hey guys,

I have an older house and need to reroof the main house roof.

The one section of roof will never be able to be seen unless you are actually up on the roof. I am debating what to use to redo that section of roof. I was thinking of rolls of asphalt (they are roughly 16" in height). The roof has maybe a 10-20 degree slope. Would this be usable on this slope? Are there any other cheap options that are easy to install?

And what is the minimum slope for using asphalt shingles anyway?

Thanks for the help
Old 11-18-07, 02:41 PM
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2:12 pitch (2" of slope per foot) is the minimum amount of slope for most types of shingles. You'll follow the manufacturer's directions (usually printed on the package) for low slope conditions.

Some manufacturers recommend two layers of #15 felt to be lapped 18" on such roofs. Some roofers cover their bases by applying ice and water shield to the entire low-slope area prior to laying any shingles, since ice damming and wind driven rain are the potential problems with low slope roofs.

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