Porch roof a 3:12 pitch - Problem?

lexmomof3November 21, 2012

The pitch on our roof over the porch is 3:12. It looks flat to me but I'm sure that without good information why it should be steeper, my husband won't want to change the plan. The plans are already purchased so if we make it steeper, it would have to be something that the builder does by adjusting as he's building. I've read (through another post regarding the dormers) that it should be a 4:12 pitch. Can some please advise? Thanks!

Thank you for reporting this comment. Undo
EngineerChic

Yes, it should be 4:12 in order to use shingles like on the rest of the roof (and even so, you'll want the ice-n-water shield on the whole thing).

Now, if it works out to 3.923764:12, you are still okay, but the target should be 4:12 :)

This isn't a big change and should not require new plans. We adjusted the pitch of our porch roof so it looked right and didn't leave a teeny sliver of siding under the windows above it. I mean, our GC did that and he did it on the fly (no extra permits or reviews needed).

I believe the reason for this is that if you don't have the pitch steep enough, then in a hard rain the water can back up the roof and that's why you'd need a solid sheet of roofing material instead of shingles.

    Bookmark   November 21, 2012 at 1:42PM
Thank you for reporting this comment. Undo
ppbenn

From the drawing the pitch does look steeper than 3:12
Our porch ended up being 5:12 and had to be decided just prior to building because of the beams needed for porch roof supports. This was literally the last thing framed on the last day of framing. The framers held up the boards to show me. It had more to do with the window sizes and how far off the floor the windows were, and how much trim I wanted to see under the windows.
The 5:12 was just fine. 3:12 would have been too flat for our house. But we would not have been able to tell from drawings.
You can see the house on the Nov "How's your build" thread.

    Bookmark   November 21, 2012 at 1:44PM
Thank you for reporting this comment. Undo
GreenDesigns

It's too flat. And in order to make it steeper, the windows have to move up. They are already too low and in a difficult spot to waterproof. The forward facing gable to the left is also creating a lot of issues with water management as well as being the wrong style cue. The home would function (and look) much better without it and with just the same nested gable as is on the right hand side.

    Bookmark   November 21, 2012 at 2:25PM
Thank you for reporting this comment. Undo
renovator8

Asphalt shingles can be installed over a full layer of Ice & Water Shield at a minimum slope of 2 in 12 but the issue is wind driven rain so it depends on where the project is located.

I'm puzzled why the OP would think anyone would be able to offer sound advice by seeing one artist's rendering of a house. To get good advice specific to your project you should show all plans, all elevations and most importantly a roof plan with slopes noted. A cross section would be very helpful too.

For the fee you are paying for a pre-designed plan set I would not assume the drawings have been properly coordinated or that they meet reasonable or even minimum code standards unless a local design professional has reviewed them. A little care up front can save you a lot of agony later.

    Bookmark   November 21, 2012 at 2:53PM
Thank you for reporting this comment. Undo
lexmomof3

The house has been built for someone else within the last few years so I'm sure that it passed code. The only plans I have are the very large builder sets. We're in the middle of SC so not much snow but we do get some pretty good wind. Here's a picture of the house as built.

    Bookmark   November 21, 2012 at 3:13PM
Sign Up to comment
More Discussions
New here. Please critique my house plan sketch, thanks
Hello. We are a family of 5 hoping to build a house...
angeliquereagan
Exterior entry stair or enclosed interior entry stair
Your valuable advice will be appreciated. We are every...
siena_s_dad
After building....items you wish you would have thought of..
Hello, for those of you that built a house. After...
einajr
window cuts in concrete foundation pour question
Hello, I had a quick question regarding a 9' poured...
jim8153
Cad or blue print sets?
Which is better to get? I assume cad because the plan...
zkgardner
Sponsored Products
Outdoor Eucalyptus Oval Extention Table with Foldable Butterfly
Overstock.com
Two Boats Outdoor Wall Art
Grandin Road
4' Red Cedar Royal Highback Swing
Fifthroom.com
Naval Outdoor Rug
$89.00 | FRONTGATE
Saturn Outdoor Wall Sconce No. 1908 by Hinkley Lighting
$239.00 | Lumens
Green Goddess Glass Pitcher
$44.99 | Dot & Bo
Gizaun Art Light House Inside/Outside Full Color Cedar Wall Art - LH1624
$79.00 | Hayneedle
Quoizel Bain Mystic Black Large Outdoor Wall Lantern
Lamps Plus
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™