Timber decking on pre-existing concrete slab

Discussion in 'Landscaping and Outdoors' started by andyb145, Jul 11, 2018.

  1. andyb145

    andyb145 New Member

    Hi all.

    We have a 12 x 8ft concrete slab at the back of our garden, that sits about 3 inches lower than the paved patio that surrounds it. We’d like to put some decking on the slab, and then a shed on top of a portion of the decking.

    Any issues we might encounter? In particular, should there be a damp proof membrane for the whole of the slab, or just where it is contact with the decking joists? I was thinking of using Jouplast Plastic Adjustable Decking Risers to level the joists.

    Thanks in advance!

  2. DIY womble

    DIY womble Well-Known Member

    Not used them , would be concerned about timber warping upwards and deck rocking , one nil to England
  3. DIY womble

    DIY womble Well-Known Member

    What joists are you intending to use
  4. andyb145

    andyb145 New Member

  5. DIY womble

    DIY womble Well-Known Member

    Hi ,sorry for late reply actually went to work today and no signal, . the joints look too expensive to me , wickes usually cheaper , I would fix to concrete with plastic packers to level and stop any warping or rocking of the deck , for long term I would use steel joists and stainless screws but I'm Ott and you should pay no attention , cheers
  6. andyb145

    andyb145 New Member

    Ok, thanks, will have a look at Wickes.

    What do you reckon about a damp proof membrane? Get one to cover the whole slab? Anything on top of the membrane?
  7. DIY womble

    DIY womble Well-Known Member

    No membrane required

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