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I am not sure if the sand was washed away by the water that is going under the patio in that corner or the bedding material is simply missing here. The paver below is from the left circled area in the second photo. That corner is actually raised a little bit which is the opposite that should happen if the sand was washed away from under the paver. So ...what material was used for bedding here? Can I say that the bedding is missing?

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It's hard to tell from the picture but it may be -1/4" crushed gravel that was used as bedding. We used that quite often in place of a mortar type sand because it didn't compress as much but still allowed easy grading and workability.

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  • Any concerns regarding permeability to water compared with regular bedding sand?
    – MiniMe
    Commented Nov 12, 2014 at 17:52
  • because it is coarser than masonry sand it is most likely a little less absorbent but water would flow through either easily.
    – BD72
    Commented Nov 12, 2014 at 18:06
  • That is my concern that it might release the water to the underlying layer too quick and that layer will flood>
    – MiniMe
    Commented Nov 12, 2014 at 18:36
  • I'm not clear on "That layer will flood"? Are you worried about standing water on the pavers? The moisture is supposed to run off and run through the pavers. What is the layer below your sub-base? Is it clay? It should flow away from the house and down into the ground. What are you hoping for?
    – BD72
    Commented Nov 12, 2014 at 21:50
  • I think that I read somewhere (pavingexpert.com) that sand is better because it releases the water gradually into the sublayers, alowing them to drain. If the sublayers flood somehow (in my case because the water pools in settled areas) the pavers will move because the sublayers have water and the pavers lose the base
    – MiniMe
    Commented Nov 13, 2014 at 1:04

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