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Wall plate or Hanger in brick - flat roof to existing house

Discussion in 'Roofing and Guttering' started by Steve111222, 4 Mar 2019.

  1. Steve111222

    Steve111222

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    Hi,

    I will be having a small flatroof to the side of the house (2m x 2m).

    Wanted to check if I need to put the Masonry Joist Hangers directly into the existing Brick Wall?

    Or if I can put a timber wall plate and then timber joist hangers go into the wall plate similar to attached (I have brickwork instead of Blocks)?

    • If so is there specific type of bolt i should use to fix the wall plate to the existing brick?

    • Should the timber joist hangers be fixed only to the wall plate? i.e. they don't need to be screwed through the wall plate and into the brickwork?

    • What size wall plate will i need? I will be put 4x2 ceiling joists there


    Roof build up will be joists + firrings + Ply + 100mm Celotex + OSB3 then most likely EPDM roof.

    Existing wall is a cavity wall - external will be brickwork (where the new roof will be attached to), 100mm cavity then thermalite.


    Thankss..
     

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  2. Notch7

    Notch7

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    A 4 x 2 wall plate should be fine.

    Bolt to wall, rawlbolts should do. I think the concrete anchor hex bolts are used for loadbearing wall plates by builders as well -not totally sure on that though.

    joist hangers are nailed (never screwed) in place. Use the correct 3.75mm x 30mm twist joist hanger nails.

    Also there are joist hangers for 45mm 47mm 50mm to suit the varying size of 'regularised' joists.

    4 x 2 joists have a span of up to 2000mm so should be fine -prob at 400mm ctrs
     
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  3. Steve111222

    Steve111222

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    Thanks for the quick reply!

    So Raw Bolts would be something like this https://www.screwfix.com/p/rawlplug-rawlbolts-m10-x-115mm-5-pack/87759? (was the first result on google).
     
  4. Notch7

    Notch7

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    Yes, although you need longer ones. Im not sure what diameter you need.

    They need to stick out from the wall by about 65mm or so ie thickness of wall plate plus enough for washer and nut.
     
  5. DIYnot Local

    DIYnot Local

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