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  1. #1
    Join Date
    Mar 2008
    Location
    Charlotte NC
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    2,303

    Default Purlin, no brace?

    Have not seen this before. 20 year old house, rafter framed 16"o.c. with a perlin and no braces? Vertical piece (perlin) was only toe nailed to the bottom of each rafter. Roof was very solid to walk on and there was no noticeable sag in the rafters. I did not measure the span but est. at 15-16', probably within the acceptable span for 8" rafters 16" o.c. So why is the perlin there and should I call for P.E. ?

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  2. #2
    Join Date
    Mar 2012
    Location
    Lansdale, PA
    Posts
    876

    Default Re: Purlin, no brace?

    Quote Originally Posted by Vern Heiler View Post
    Have not seen this before. 20 year old house, rafter framed 16"o.c. with a perlin and no braces? Vertical piece (perlin) was only toe nailed to the bottom of each rafter. Roof was very solid to walk on and there was no noticeable sag in the rafters. I did not measure the span but est. at 15-16', probably within the acceptable span for 8" rafters 16" o.c. So why is the perlin there and should I call for P.E. ?
    If I assume S.P. #2 grade with a ground snow load of 30 psf, the allowable span (horizontal) is 16 feet, 2 inches for 2x8s at 16-inch o.c. I would assume that someone thought this may keep the rafters a bit more even. I see no reason to be concerned.


  3. #3
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: Purlin, no brace?

    Quote Originally Posted by Mark Reinmiller View Post
    If I assume S.P. #2 grade with a ground snow load of 30 psf, the allowable span (horizontal) is 16 feet, 2 inches for 2x8s at 16-inch o.c. I would assume that someone thought this may keep the rafters a bit more even. I see no reason to be concerned.
    Twenty years and no sag adds to your argument. Thanks Mark.

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  4. #4
    Darrel Hood's Avatar
    Darrel Hood Guest

    Default Re: Purlin, no brace?

    It is probably intended to keep the rafters from rolling.


  5. #5
    Join Date
    Mar 2012
    Location
    Lansdale, PA
    Posts
    876

    Default Re: Purlin, no brace?

    Quote Originally Posted by Darrel Hood View Post
    It is probably intended to keep the rafters from rolling.
    It could be, but that is not a good way to do that. Also, if attached properly at the top and bottom the rafters should not roll.


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