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Rafter top plate height

Discussion in 'Building' started by 23vc, 4 Apr 2018.

  1. 23vc

    23vc

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    For a lean-too cut roof, is there any rule of thumb for working out how high you can go with the rafter top bearer, taking into account the batten and tile profile? I’m trying to work out how high I can go with mine leaving enough room for the cover flashing under the upstairs window cill.
    I’ve ordered a sample mendip , so I can hopefully work it out when I get it, but any general pearls of wisdom appreciated! Cheers
     
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  3. noseall

    noseall

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    We usually locate ours beneath the rafter rather than butt the plumb cut against the face of bearer.
     
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  4. 23vc

    23vc

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    Yeah I was planning to do the same. I’m trying to work out the distance between rafter top and the mortar joint which the flashing will be cut into.
     
  5. tomfe

    tomfe

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    You need 150mm of flashing, you can get away with 100mm or even 75.
    So it's just roof covering thickness + if it's a warm roof, insulation thickness +deck + 150 for the flashing.
     
    Last edited: 5 Apr 2018
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  6. 23vc

    23vc

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    Nice one, thanks
     
  7. ^woody^

    ^woody^

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    75mm for the tile and batten, then the rafter depth x 1.5 gives an approximate depth.
     
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  8. 23vc

    23vc

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    Thanks woody
     
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