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Old 02-24-2008, 05:53 PM   #1
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lowest pitch for shingles


I have a roof deck with about a 1/12 pitch, is that too low of a pitch to use shingles. There is a some type of membrane on it right now but I want to stay away from the membrane. Thanks for any advise.

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Old 02-24-2008, 05:57 PM   #2
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lowest pitch for shingles


the shingles usually have instructions on the package, if not, get the manufacturer's literature. I don't believe that most shingles are recommended for less than 3/12 pitch (if memory is correct)

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Old 02-24-2008, 06:04 PM   #3
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lowest pitch for shingles


I believe it is 3/12 for roof shingles.

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Old 02-25-2008, 06:46 PM   #4
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lowest pitch for shingles


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Originally Posted by redrider View Post
I have a roof deck with about a 1/12 pitch, is that too low of a pitch to use shingles. There is a some type of membrane on it right now but I want to stay away from the membrane. Thanks for any advise.
Yes it is too low of a pitch for composition shingles to be applied, even if you were to install a continuos solid covering of Grace Ice and Water Shield under them, they would deteriorate significantly quicker, due to not being able to shed the water away from them as required.

The asphalt composition portion of the shingles are not made to be left in a saturating condition for prolonged periods of time. They would shortly begin to deteriorate and become crumbly and brittly, once again requiring a new roof application.

By the time that you add in the cost of installing the Ice and Water Shield membrane, plus the asphalt shingles, (even fiberglass shingles have asphalt composition contained within.), you would be about at the cost of having installed an appropriate flat roofing membrane in the first place, which will last much longer.

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Old 03-02-2008, 11:38 PM   #5
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lowest pitch for shingles


Reframe a new deck,or use IB roof systems for a lifetime warranty
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