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Patio build up question...where does the membrane go?

Discussion in 'In the Garden' started by nuzuki, 25 May 2018.

  1. nuzuki

    nuzuki

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    Hi all,
    Im about to start doing a patio. Ive dug out the area about 50-80mm down. I have some limestone scalpings I'll be using as hardcore. Do I put the membrane under the scalpings or on top? Also when people refer to a paving slab mix are the slabs laid onto a dry mix or wet mix? I know grouting can be done with a dry or very slightly wet mix I wasnt sure if the same principles are used for laying the slabs.

    Also I have two different types of membrane available for the job. I have some woven landscaping fabric (100gsm type) or I have some leftover damp proof membrane from another project. Which would be better for the patio? Im keen to use the dpm so I can used the landscaping stuff for other areas in the property.

    Thankyou for your help
     
  2. freddiemercurystwin

    freddiemercurystwin

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    Membrane why?
     
  3. nuzuki

    nuzuki

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    To stop the weeds man...
     
  4. bobsuerita

    bobsuerita

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    put under its only too stop sub base and sub layer {ground) from mixing not for weeds they will grow in base layers also 50mm far too shallow as scalpings are usually 40mm too dust
     
  5. lonner

    lonner

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    If you was a traveller doing a patio , id say your above average.

    Are you moving ?
     
  6. bobsuerita

    bobsuerita

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    no mention of tarmac:cautious:
     
  7. nuzuki

    nuzuki

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    Lol nope not a traveller very settled here. I just remeasured and have about 100mm under the slabs if not more (after digging the area continiously for the last 4 evenings). Ive put the DPM stuff down I wanted to use up and have so far barrowed about 12 lots of scalpings. If I get a chance i'll upload some pics. Area of patio is roughly 7m by 5m.
     
  8. nuzuki

    nuzuki

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    The scalpings we ordered from earthline were 20-40mm no dust apparently. Although it rained so that could be masking the dust.
     
  9. Ian H

    Ian H

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    I wouldn't have used the DPM, any water that passes through will be trapped.
     
  10. nuzuki

    nuzuki

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    I ended up making slight holes in the DPM with a craft knife all over to try and prevent this. I also took more earth out at the point furthest from the house to encourage water to run away. I saw a youtube vid that said to do about 30mm run off on the patio but i guess it depends on the patio size.
     
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