If any can help with info on this, thanks.
My concrete patio slops down for rain runoff but slops too much I
think. I want to put pavers down but will need to build up with sand
over the concrete patio. At the furthest end of the patio it will need
to be about 5 inches higher. So I am asking if part of the patio only
has say 2 inches of sand and as I go out it get to be up to 5 inches
of sand will this work or will the sand drop and everything goes
Sand on a sloped concrete slab may very mush be washed away by rains,
especially if you tend to have heavy rains in your area.
The best would be to rectify the slope with a sand:cement screed, then to
install your pavers over an even sand layer.
At the lowest end, where the risk of sand running away with rainwater is the
highest, set a "sand stop" with a geotextile, synthetic felt (How you call
that in the US?) turned up on a small perforated (Not 100% continuous) kerb.
Make sure to keep some slope however and not to block the drainage system or
else you may get a nice water pond instead of a patio :-)
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