Fixing joists or just the weight of the roof?

Discussion in 'Building' started by onionsa, 11 Mar 2020.

  1. onionsa

    onionsa

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    I’ll be putting a flat roof on a 3x3 garage extension/workshop shortly and had looked to mimic the existing roof which looks to run joists across the width onto the top of the bricks, with braces running lengthways between them. It doesn’t look like the joists are secured to the single skin wall, so is that ok and the weight of the roof will keep it secure or do they need fixing somehow onto the top of the bricks?

    Thanks
     
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  3. KenGMac

    KenGMac

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  4. onionsa

    onionsa

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  5. bobasd

    bobasd

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    are you using a wall plate?
    why dont you post pics of your project?
     
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  7. KenGMac

    KenGMac

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    The rational behind a "long" strap is to spread the uplift forces acting on the roof surface.

    If you "restrict" the area of wall / block that is being used to counteract the uplift to [in the case of the device you have found] the uplift force is being restrained by one block rather that [in the case of the "long" strap] a very large weight of wall?

    Hope this makes sense?

    You could search for a plastic cover that will reduce the visual impact of a galvanised strap??

    Ken.
     
  8. 23vc

    23vc

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    You can also fix the strap down the back side of the inner skin if that’s where the wall plate is, if you aren’t using a single skin wall and build it in the right order. On the one I’m doing at the mo, I don’t mind the straps so just fitted them as normal.
     
  9. noseall

    noseall

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    Joists fixed to a wall plate - use bent straps to hold the roof down.

    Joists resting directly on the wall - use twisted straps.
     
  10. onionsa

    onionsa

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    Thanks for the replies everyone. Very helpful. As unsightly as they might be I will get some twisted straps for the joists to secure them.

    Thanks again!
     
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