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roof: minimum pitch for shingles George 08-13-2008
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Posted by George on August 13, 2008, 4:03 pm


We have a roof problem that could most easily be solved by doing
somethign that would lower the pitch from 4:12 to 3:12. I keep hearing
that 4:12 is the "minimum" pitch for a shingled roof. But, that's also
what it was in the Stone Age.

I wonder if that rule still applies, if I underlaid the whole thing with
a bituminous membrane (aka "ice and water shield")?

Thanks,
George

Real Goods Solar, Inc.
Posted by Colbyt on August 13, 2008, 4:21 pm



> We have a roof problem that could most easily be solved by doing
> somethign that would lower the pitch from 4:12 to 3:12. I keep hearing
> that 4:12 is the "minimum" pitch for a shingled roof. But, that's also
> what it was in the Stone Age.
>
> I wonder if that rule still applies, if I underlaid the whole thing with
> a bituminous membrane (aka "ice and water shield")?
>
> Thanks,
> George

4:12 is the minimum for a "standard installation". The IBC code allows
shingles down to a pitch of 2:12 with restrictions.

At 3:12 I would use 30 pound felt well over lapped and reduce the exposure.
The roof may not last quite as long but it should shed water. It may also
affect your warranty. Never seen one of those pay off any way. :)

Check for local code restrictions before you start. Some local codes are
more restrictive.


Colbyt



Posted by Joe on August 13, 2008, 8:55 pm



>snip<

> if I underlaid the whole thing with
> a bituminous membrane (aka "ice and water shield")?

That would likely work, but using Permafelt instead of 30 lb. felt
would be more effective, and somewhat pricier, but cheaper than EPDM
or other membranes. HTH

Joe

Posted by dpb on August 13, 2008, 9:00 pm


George wrote:
> We have a roof problem that could most easily be solved by doing
> somethign that would lower the pitch from 4:12 to 3:12. I keep hearing
> that 4:12 is the "minimum" pitch for a shingled roof. But, that's also
> what it was in the Stone Age.
>
> I wonder if that rule still applies, if I underlaid the whole thing with
> a bituminous membrane (aka "ice and water shield")?


In conjunction w/ Colbyt's suggestion, look at the manufacturer's web
site for information. IIRC, most have instructions for minimum slope
installations and also minimums. I was thinking 4:12 was a little
steeper than what I recalled them stating, but I could be wrong (and
didn't go look).

--

Posted by mm on August 13, 2008, 9:31 pm


wrote:

>We have a roof problem that could most easily be solved by doing
>somethign that would lower the pitch from 4:12 to 3:12. I keep hearing
>that 4:12 is the "minimum" pitch for a shingled roof. But, that's also
>what it was in the Stone Age.

Wish I could help. Come on, let us know why a shallow roof would
solve yoiur problem?

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