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Elevated Decking Design Advice

  • 17-11-2015 9:51pm
    #1
    tedimc
    Registered Users, Registered Users 2 Posts: 624 ✭✭✭


    I'm renovated a split level bungalow and have planned to put decking around the side leading to the front. The side area is on a slope.

    The decking is elevated and I've drafted a rough plan on how I'm going to tackle it. But going through the finer details I've a few questions and would appreciate peoples advice.

    Decking Drawing.jpg

    The make of the attached is as follows.
    • Concrete pillars are made up of 9 inch concrete pipe with re-bar and filled with concrete. Max height will be 9 feet.
    • 4 anchor bolts will be set in the top of the concrete pillars.
    • The 6 inch RSJs will be bolted down to the pillars using the anchor bolts.
    • 2 inch angle will be bolted onto the wall of the house, using rawl bolts.
    • 6*2 joists will sit on the leg of the angle and run out to sit on top of the 6 inch RSJs.

    A couple of questions I have are:
    1. Should I keep the RSJs raised off the top of the concrete pillars - using a bolt and plate support it? Like this: http://thumbs.dreamstime.com/z/steel-beam-concrete-foundation-rusty-attached-to-round-drilled-pier-anchor-bolts-49033877.jpg
    2. What size anchor bolt/nut should I use? Would M12 be enough, or go to M16.
    3. Will the angle be ok bolted directly to the wall, or again should I allow some space between the steel to prevent water build up? I had thought of just running a line of sealant along the top of the edge/wall.
    4. How far out should I space the rawl bolts in the angle into the wall?
    5. How do I prevent the 6*2s coming away from the wall? I could run them into the web of the RSJs but I want them to overhang a little over the steel if possible. Or I could affix a wall plate to the top of the steel and nail the 6*2s to that.
    Interested in peoples feedback on this.
    Thanks


Comments

  • #2
    whizbang
    Registered Users, Registered Users 2 Posts: 2,023 ✭✭✭whizbang


    4 anchor bolts will be set in the top of the concrete pillars.
    Not in 9" of homemade concrete pillar.

    Make up a mounting plate to be set into the concrete, ideally weld to the rebar. There won't be a lot of load on these, so dont go mad.
    The bigger load with will be on the angle to the wall joints, as there will be sideways forces also.


  • #3
    gctest50
    Registered Users, Registered Users 2 Posts: 9,597 ✭✭✭gctest50


    tedimc wrote: »
    ....Interested in peoples feedback on this.
    Thanks

    Get an engineer involved, a real live actual one



    a few of the reasons why you should :

    How many people can stand on it at any one time ?

    What sort/size/depth are the foundations for the pillars (frost etc)

    How strong do the pillars need to be

    The wall you are bolting to - is it ok ?


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