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Thread: Plywood clips

  1. #1
    Join Date
    Mar 2007
    Location
    Daniel Island, SC.
    Posts
    230

    Default Plywood clips

    What is the requirement for using clips on a 1/2 " roof deck 24 " span dated to 1985. There was none at this house.

    Jim

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  2. #2
    Join Date
    Jan 2011
    Location
    Guelph,Ontario
    Posts
    169

    Default Re: Plywood clips

    half inch ply does not require clips at 2 feet OC,but 3/8 ply does at 24 OC.


  3. #3
    Join Date
    Apr 2007
    Location
    WESTMINSTER CO
    Posts
    1,089

    Default Re: Plywood clips

    are you talking about h clips on roof sheathing?

    cvf


  4. #4

    Default Re: Plywood clips

    Quote Originally Posted by JIM MURPHY View Post
    What is the requirement for using clips on a 1/2 " roof deck 24 " span dated to 1985. There was none at this house.

    Jim
    As a former contractor, I've done many roofs and never used 1/2" or 3/8/" plywood on 24"centers. I believe code requires 5/8" minimum 24oc. However, I think it's a good practice to use clips with 5/8" decking on 24oc. 1/2"plywood at 16oc is still weak and if you are a 200lb man standing on a joint where the plywood meets, it will give. You may not like the H clips but they are a little bit of insurance.


  5. #5
    Join Date
    Oct 2009
    Location
    Portland, Oregon
    Posts
    53

    Default Re: Plywood clips

    Quote Originally Posted by Bruce Conway View Post
    As a former contractor, I've done many roofs and never used 1/2" or 3/8/" plywood on 24"centers. I believe code requires 5/8" minimum 24oc. However, I think it's a good practice to use clips with 5/8" decking on 24oc. 1/2"plywood at 16oc is still weak and if you are a 200lb man standing on a joint where the plywood meets, it will give. You may not like the H clips but they are a little bit of insurance.
    I see lots of attics as a weatherization contractor, where I do all the work. I see only 15/32" plywood sheathing, where I am able to check. Here is a relevant observation in a blog post.


  6. #6
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,546

    Default Re: Plywood clips

    H-clips - patent granted (to Mr Simpson) in '86, with patents for an earlier 3-legged version in '82.

    H clip - M&O Products, Inc.

    Likely not required in the mid-80's in your area. I would not call it a defect under the circumstances, but I might report the 1/2" plywood on 24" centers as a weakness and move on. First confirming that it really is 1/2" of course.

    BTW, H-clips have a second purpose. They provide a gap between the sheets to allow for swelling.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  7. #7
    Join Date
    Sep 2012
    Location
    Calgary, Alberta Canada
    Posts
    2

    Default Re: Plywood clips

    Not Required in Calgary on 1/2" plywood or OSB @24" o/c, but anything less must have


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