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Size of beams and posts for pergola?

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  1. #1
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    Default Size of beams and posts for pergola?

    Hi,
    I am after some advice on the size of posts and beams for a pergola I am planning on building over our deck. The deck will run 7m along the house and extend 4.5 m out from the house.

    I am going to use two posts either end of the deck to support it so need to know the size of these posts (150x150 200x200?) and the 7m beam. I am going to be using hardwood for everything. Also the posts will be approximately 3.7 above ground as the deck is already 1m above ground.

    I will be supporting the other beam off the top of the house frame up through the roof in 4 spots every 1.75m so will get away with a much smaller beam. If anyone could help in sizing these 4 bits for me I'd really appreciate it.

  2. #2
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    Not sure about thicknesses but 7m is a hell of a long span. Not sure if you will be able to buy that one of the shelf !And at 3.7m above ground i think some sort of crossways bracing might be required.

  3. #3
    Sssshhhh! THE LIBRARIAN's Avatar
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    I've just uploaded a new file into the Library on the Technical Data for Pergolas and Carports. Admittedly its from Queensland, but it may help. HERE

  4. #4
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    Thanks for that. Unfortunately it doesn't go up to a 7m Span. Does anyone have any lvl tables with spans? I might have to use a lvl I'm thinking.

  5. #5
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    you could do 7m with 2/290x45 F17seasoned hardwood, if you can get it...

    LVL is the way to go. Download the Hyne Design program. (I dont have it installed on this PC)

    Either of those post sizes will do it. Even 120x120 I think. BRACING will be most important.

  6. #6
    Soldiers Earned Your Right To Free Speech watson's Avatar
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  7. #7
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    EDIT : updated for Hyne Design v7. Looks like Hyne LVL of 360x63 for your 7m beam. Either way this is a huge span and so very large timbers are required. Adding a centre post brings it down to a bare minimum of 130x45 in LVL or 120x45 in "KD Hardwood F27" or "Seasoned Structural Hardwood F17". If you can't add a centre post you may also consider getting steel beam engineered but it too will be huge/even heavier

  8. #8
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    Can you bring you posts inwards to reduce the span and have cantilevered ends ?

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