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Layer(s) below resin bound surface on existing bases

Discussion in 'Building' started by nutbag, 22 Apr 2015.

  1. nutbag

    nutbag

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    Location:
    London
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    Hello all. Had a good search before posting but couldn't find anything similar - if you are aware of this being answered before, please redirect me!

    I am planning on putting down a patio finished using resin bound aggregate. The existing surface is a split of two areas: 1) secured and stable sandstone paving on mortar base, and 2) loose sand with stones (this was previously underneath a thick later of concrete that was the base of a conservatory).

    The paving is approx 190mm below the level I need it to be before the resin sits on top and the sand/stone surface is approx 130mm below.

    My plan is as follows, given very light traffic over the finished surface: level the sand area then compact before adding 5:1 sharp sand/cement mix. For the paving area, cover paving with plastic sheet then add either add some form of crushed hardcore/aggregate or sharp sand base, then compact it before adding same mortar mix to bring to level.

    Could someone please validate my plan or tell me to tear it up and advise a better method! Any approximate heights for the levels would be gratefully received too (e.g. for the sand area, I should use 50mm of mortar so add another 80mm of compacted sharp sand before the mortar)
     
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