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Decking Projcet - advice?

Discussion in 'In the Garden' started by RickH, 5 May 2013.

  1. RickH

    RickH

    Joined:
    10 Dec 2008
    Messages:
    262
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    Location:
    West Glamorgan
    Country:
    United Kingdom
    Bought all my boards for decking while wickes had a 40% discount offer in place .... now time to get on with it.

    The 'idea' being to end up with : http://tinyurl.com/bu6pg52
    I bought the "Decking construction plans ebook ... and have turned this sketch into a proposed plan.
    The manual advised 150 joists at 400 centres when boards run at 90 deg, and reducing centres to 275mm when boarding diagonal ..(reason- to keep fixings at 400 centres)
    I have drawn up as following layout ... http://tinyurl.com/cp2lo47

    The left hand side originally I was going to use joist front to back .. but at 3.5m long pretty sure these would be too much of a span for 150mm.
    So thought about a support beam running left to right of 150 x 50 ... then the joist run from front to that and same for back size of joist span then reduced to under 1.8m which should be OK.
    Using 150 x 50 for the joists ... around perimeter again 150 x 50 ... there will be some 150 x 50mm spacers then a 100 x 50 outer ring, this has 2 purpose ... it allows me to fit a 100mm wide horizontal trim around edge of deck .. and creates a bit of a shadow / offset hiding the 150mm joist & concrete pads.
    I will fit a fascia onto this 100 x 50 ... maybe a piece of deck board, or maybe just plain 100 x 25 or similar.
    Construction is in effect: http://tinyurl.com/bq4gyqb

    Couple of Q's:

    Posts will be 100x100 resting on concrete pads .... arranged these so no more than 1800 apart .. is that OK ? ... don't want more than I need (or less)
    4 of the posts come up though deck to become the 4 corner pots for roofed section.

    Not sure what to use to fix posts to pads ... guess I don't need to fix all of them, maybe corners and couple in middle .... could use
    http://tinyurl.com/c5ygora
    or
    http://tinyurl.com/bmqdc92

    Is my assumption of front to back joist correct ... i.e. 3,5m would be to long and having them connect to middle 'left to right' beam correct ?
    If so the Q is then .... do you typically skew nail joist together ... or use mini joist hangers :
    http://tinyurl.com/ctd4ddb possibly with a skew nail at top
    looked at longer hangers .. http://tinyurl.com/cek7hbe

    but if these are folded over top of joist it will stop boards lying flat.
    I could use something like this ... http://tinyurl.com/bp7xlr4

    But open to suggestions.
    [/b]
     
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