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Roof pitch for wind/rain?

migraine | Posted in Construction Techniques on June 10, 2003 07:48am

getting ready for the final plans to be done on our home, and the builder is doing the plans.  Because of the span of the rafters, the guy has tried to talk me into a 5:12 pitch.  If we raise the pitch higher, we will need to go up one size in lumber.  Because of the rain and wind factor, this has concerned me.  We are required to have a 110mph roof on our home, and yes it does blow hard when it rains, no snow though.  I’m worried about rain being blown under the shingles.  Is this correct thinking, and what would you’all recommend as an ideal roof pitch?  Of course their may be architectural restraints, and we do want the roof affordable, but I also don’t want to shoot off my foot for a few dollars more.  Again, as always ,thanks for your input

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Replies

  1. TommyB12 | Jun 10, 2003 09:25pm | #1

    I don't think I would limit the design for my house by going up one size in lumber.  We generally go one size up anyhow.

    I don't think the rain and shingle mixture is a problem on a properly detailed 5/12 pitch roof, but it would be less forgiving of a faulty installation.

    I think I read somewhere that a 5/12 creates the greatest amount of lift, similar to an airplane wing.  I have seen first hand where 5/12 is not a good choice for a loosely attached 40x60 picnic pavilion in a 70mph breeze.

    Tom

  2. johnharkins | Jun 11, 2003 12:19am | #2

    pardon my paltry two cents  where are you    how wet  -  on a bluff  -  have hurricanes    what kind of shingles are you going  to use?   5/12 should be fine for comp shingles   apply per specs on material   you'll need optimal adhesion

    if you're talkin cedar shingles you should give them a chance w/ a slope of 7/12 or better  many people talk of how the product ( cedar shingles ) is so inferior to the olden days but what is really happening is the preponderence of roofs today that have very little slope - 4/12  or 5/12   put them on a 14/12 and fifty yrs later you'ld swear you could plane or sand them and put them back up

    I realize where you are in the process and budget are huge consideration but w/ a moniker like you have I'd go for something steeper  ( have no idea how steeper impacts the 110 mph roof? )

    have a great time w/ your project    John

    1. migraine | Jun 11, 2003 12:52am | #3

      About a mile from the ocean on the Wash coast.  We plan on using 35-40yr comp shingles.

  3. Piffin | Jun 11, 2003 02:47am | #4

    Design the pitch for the appearance.

    5/12 is fine for rain but will cach a little more wind. Use tarpaper ( or the new breed of similar) underlayment and lay the shingles in weather warm enough that it will seal them and you have no worries.

    .

    Excellence is its own reward!

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