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Timber sizes for deck?

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  1. #1
    Novice Lakeside's Avatar
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    Default Timber sizes for deck?

    hi,

    just wanting some advice on bearer joist sizes for a proposed deck.

    pre primed posts
    treated pine bearers/joists
    140x25 blackbutt decking boards
    90x19 blackbutt for screening
    s/steel tubular handrail
    s/steel wire

    would it be possible to build the open riser stairscase out of blackbutt?
    What spacing could my posts be? size of footing? 300x300x300?
    600mm joist centres?
    should i use metal cross bracing? or will the angle of the staircase brace it enough?
    and lastly... is there any online shops where i can source the handrail material from?


    thanks for any help

  2. #2
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    Bearer placemnt @ 2000 mm centers,(so two rows)
    Bearers 240 x 45 mm @ 1700 mm spans, floor load width 2000 mm, floor live load 3.0kpa No ceiling load.
    Joists 140 x 45 mm @ 450 mm centers (2000 mm span)

  3. #3
    Novice Lakeside's Avatar
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    is it possible to nail off the joist hangers with a coil gun? if so what size nail should i be looking at?

    thanks

  4. #4
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    lifted from the Pryda brochure

    Machine Driven Nail Use
    Where appropriate, 32x2.3 mm Duo-Fast C SHEG
    (ie: screw hardened electro galvanized) machine
    driven nails (code D40800) may be used instead of
    the specified 35x3.15 mm Pryda Timber Connector
    Nails to fix Pryda connectors provided that:
    • 20% more nails are used (eg: 5 instead of 4, 4
    instead of 3, 3 instead of 2) or alternatively, design
    capacities are to be reduced by 20% where the
    same number of nails are used
    • machine driven nails are driven at nail spacings
    and edge distances similar to the hole pattern but
    these nails are not driven into the holes.

  5. #5
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    Lifted from pryda pdf, just make sure you wear safety glasses

    Machine Driven Nail Use
    Where appropriate, 32x2.3 mm Duo-Fast C SHEG (ie: screw hardened electro galvanized) machine driven nails
    (code D40800) may be used instead of the specified 35x3.15 mm Pryda Timber Connector Nails to fix Pryda
    connectors provided that:
    20% more nails are used (eg: 5 instead of 4, 4 instead of 3, 3 instead of 2) or alternatively, design capacities are to be
    reduced by 20% where the same number of nails are used
    machine driven nails are driven at nail spacings and edge distances similar to the hole pattern but these nails are not
    driven into the holes.

  6. #6
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    Quote Originally Posted by cherub65 View Post
    Bearer placemnt @ 2000 mm centers,(so two rows)
    Bearers 240 x 45 mm @ 1700 mm spans, floor load width 2000 mm, floor live load 3.0kpa No ceiling load.
    Joists 140 x 45 mm @ 450 mm centers (2000 mm span)

    Hi Cherub65,
    Can i just ask u something quickly? my deck 4000~4400mm wide so i was thinking leaving a 200~210mm overhang on both ends of the beaer so the effective middle span is 3600mm. i plan on using two posts along the bearer so the actual unsupported span is 1.8m.

    will this work without noticeable sag under load? also what would be a suitable sized bearer for this design.

    if u have time could u please also show me any ways to reduce the depth of the actual deck?(eg. joist depth + bearer depth+deck boards) This is because the coucil requires a 400mm clear space between the land and the bottom of the beaers but im trying to keep the deck below ~600mm in total height.

    thank you in advance

  7. #7
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    what is overall size of the deck, will it have a roof?

  8. #8
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    Quote Originally Posted by cherub65 View Post
    what is overall size of the deck, will it have a roof?
    the overall size is about 14m*4m. and it will not support a permanent roof. i will probably design for a pull out canvas shelter that covers only a part of the deck.

    i was thinking of
    1. using two posts along the bearers giving a 1.8m unsupported span and 200mm overhang on either ends or 400mm on only one end. (not sure what size, 190*45? 240*45?)
    2. 450mm joist spacing, and span of 1.8m (9045?)
    3. stirrups+posts (100*100?)

    i presume that all structure wood will be treated pine f7?

    thanks again

  9. #9
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    Bearer 240 x 45 mm F4
    Span Type is two spans with cantilever both ends for a design length of 4000 mm
    200 mm (post) 1800 mm (post) 1800 mm (post) 200 mm

    Joists 140 x 45 mm F4 (could use 140 x 35 mm)
    Continuous span 1750 mm

    PM if you need a plan

  10. #10
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    cherub65 Hi,
    I also need to have bearers of 4m
    Can i use x2 190x45 f7 tp laminated together
    When you say two spans over 4m do you mean i need to use two 2m peices and not one continuous peice ??

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