Minimum Recommended Roof Pitch


Old 10-25-16, 04:17 AM
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Minimum Recommended Roof Pitch

I'm designing a small attached addition and would like to know what the minimum recommended roof pitch is. I have a section that extends nine feet out and has a rise of two feet. Is this sufficient for a northern virginia climate where winter storms can drop as much as two feet of snow? It doesn't happen often, but it does happen every few years. Also, is a 2'x4' skylight okay to have on such a gradual slope?
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Old 10-25-16, 05:24 AM
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There is no minimum pitch. A roof and/or skylight can be flat. It just depends on how it's constructed.
Old 10-25-16, 05:34 AM
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.... and what type of roofing material is used.
Old 10-25-16, 06:17 AM
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Basically, that's a flat roof with a little extra pitch, so in that line of thinking, yes it can be done. But as PD and Mark said, the how and what are the issues.

Will this be attaching to the roof or a side wall?

Old 10-25-16, 09:15 AM
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It will be attaching to a side wall. Wood rafters/sheathing and asphalt shingles. What I was getting at was in the winter, there will up to two feet of snow resting on top for weeks at a time, so my concern is water infiltration and/or structural integrity.
Old 10-25-16, 10:14 AM
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The minimum slope for asphalt shingles is 2:12. Anything from 2:12 - 4:12 is considered "low slope" and you will need to follow the mfg's instructions pertaining to underlayment carefully. Many guys will cover low slope roofs with ice and water to prevent potential leaks... even that must be lapped more than normal on a low slope roof.
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