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Verandah beam and rafters

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  1. #1
    Golden Member manofaus's Avatar
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    Default Verandah beam and rafters

    Is there any way you can just cut the rafters and fix them to the face of the verandah beam, and then attach the eave overhang on the other side? Would like to have the verandah beam as high as possible and also minimal gap between it and the roofing. I feel like a few batten screws would work a charm here.
    sorry for the ramble.

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    What length is this unsupported overhang to be?

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    As always I can't visualise what you mean so plans and/or pix would be much appreciated.
    "A big boy did it and ran away"

    Legal disclaimer denying responsibility to be inserted here.

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    Golden Member manofaus's Avatar
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    550mm plus eave plus gutter. Instead of a rafter sitting on top of verandah beam, I would like it to be fastened to the face. This leaves no overhang for the eave.

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    Jon
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    Default Verandah beam and rafters

    If I have it pictured correctly in my head there would be a heap of loading on the fixings for the short lengths of rafters equivalents on the outside of the beam supporting the gutter etc.

    You would probably need brackets to vertically support the rafters and then they would be trying to rotate away from the beam. Maybe some metal bracing strap screwed to the top of the true rafters, over the beam and then onto the tops of the short rafter ends to try and stop them dropping.

    Can you over spec the width of the beam and then notch it to allow the rafters to run through it?

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    Quote Originally Posted by manofaus View Post
    550mm plus eave plus gutter. Instead of a rafter sitting on top of verandah beam, I would like it to be fastened to the face. This leaves no overhang for the eave.
    ....assuming the additional 550 will have roofing and gutter??
    If so, then out of timber, I think you've only got 2 options - butt it to the outside beam or sit them on top.

    If you need the additional width, extend the veranda design out an extra 550mm and still butt the rafters to the outside beam?

  7. #7
    Golden Member manofaus's Avatar
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    Yes a cantilever eave or rafter tail to support gutter, fascia, eave sheet and batten plus roofing. It's a tough ask. My verandah beam is 300mm and rafters are 150mm.

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    300mm is a big beam. I had a similar circumstance, and so got a 180mm PFC steel beam. (Had cleats welded to it to attach the rafters over)

    You may need a larger PFC (eg 200mm), but will still save precious centimetres. There is a steel span table in the Library which will give you an idea... You will need a hoist and some mates to lift it safely.

    Maybe simpler - add one more post to reduce your span, and so also reduce your beam size

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    Golden Member manofaus's Avatar
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    I know that what I should do,but the beam has been delivered. I know I could do it with a metal bracket, but I imagine it would be outside the 1684 standard and would need to be engineered. Thanks for putting your thinking caps on.

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    You are right, it probably needs engineering. Maybe something like these on each side of your 550 rafter and over the top of the beam. Test it with an adult weight off the end of the rafter, perhaps.

    Turn the picture anticlockwise 90 degrees for what I mean...
    https://pryda.com.au/product/stud-ties/

  11. #11
    Golden Member manofaus's Avatar
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    So I talked to an engineer. He mentioned I could do it as proposed, that is, a strap across the top of the rafter, beam and tail and using screws through the beam into the tail as well. But he did say it wouldn't last long because I am screwing into end grain. So I think I might be able to use truss screws as pocket screws so no end grain. Off tomorrow to ask.

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    Golden Member manofaus's Avatar
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    just to round this out, the framing company supplied oversized verandah beams. They worked it out in MGP0 and then when I said I was not lining went for some LOSP beams. Turns out they are way bigger then they need to be, so I can notch them to suit the rafters. Quick win.
    sorry for the ramble.

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    Told ya "300mm is a big beam"!

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