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Block paved patio, too much sand?

Discussion in 'In the Garden' started by garmcqui, 10 May 2020.

  1. garmcqui

    garmcqui

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    So, decided to make my own patio during lockdown. It will be with ordinary 200x100 block paving. I’ve concreted in the channel drain and the soldier/edging blocks.

    Today I put the sharp sand down and got it roughly at the right level. I’m worried there’s too much sand though, in places it will be 50mm but in others it may be 100mm. I know it should be compacted sub base, then the bedding layer.

    This is where I am at:

    60530997-A191-4465-8B02-C172E500D27E.jpeg

    So, to remedy, I’m tempted to run the wacker plate over the sand, leaving it 20-30mm low, then put a fresh bedding layer of sand down and lay the pavers on that, and run the wacker over the pavers.

    also thought about adding some 20mm gravel to the existing sand before compacting - would this be required or do any good?

    There won’t be any vehicle traffic on it, if that makes any difference.

    Any advice appreciated.
     
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  3. CBW

    CBW

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    Is this the fall,though? I wouldn’t be adding gravel. Have you visited paving expert.
     
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  4. garmcqui

    garmcqui

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    sorry, unsure what you mean? The sand is just in roughly at the moment. Ordinarily there would be a compacted hardcore layer underneath, but this just has soil, some hardcore then more sand than is ideal.

    So planning to company this layer of sand, then add some loose sand as a bedding layer and lay blocks onto that, then compact
     
  5. conny

    conny

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    When Chris mentions the 'fall' I think he referring to a slight slope towards the drain gulley to allow water to flow away instead of pooling.
     
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  6. garmcqui

    garmcqui

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    Ah yes, I would’ve preferred it sloping away from the house, but the garden’s natural fall is towards the house, and I didn’t want a step up to lawn. So had to go for the channel drain option
     
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  8. conny

    conny

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    Nothing wrong with draining towards the house so long as it can be carried away by the gulley before the gully fills in really heavy rain.
     
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  9. lonner

    lonner

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    You compact the sand, then screed off the excess.
    You need to screed it firm so it only compacts about 3-5 mm
    Your fine with that, compact again when laid cut in and sanded "joint sand"

    Set your screed about 5-7mm above the drain and pre set paving.
    You then compact new paving to level.
    This bit is the skill part, so don't hammer the hell out of the edges just overlap and maybe 2 passes with the plate.
     
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  10. garmcqui

    garmcqui

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    So you don’t think the sand being too deep will affect it, as long as it’s properly compacted?
     
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  11. lonner

    lonner

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    As long as it's all well compacted and the base is sound you'll be ok.
    But it must be screeded off with the sand tight. So if you follow that advice it will be a good solid job.

    I've done roads in block paving with 15mm to 120mm + depth sand but if it's solid it's fine.
    I used to work on about 25-40mm for domestic work but I was preparing the base so had time to make it how I wanted.
     
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