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!

    Andy
     
  2. DIY womble

    DIY womble Active Member

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

    DIY womble Active Member

    What joists are you intending to use
     
  4. andyb145

    andyb145 New Member

  5. DIY womble

    DIY womble Active 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 Active Member

    No membrane required
     

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