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Hi Liam,
I'm not familiar with using sand for laying sod (in the US, we tend to call rolls or squares of turf "sod" - not sure why). Is it spread over the existing soils to provide a bedding layer for the turf? We do that here as well, but we tend to use a more loamy, black soil (if/when it's available).
And I don't even know what building sand is - is it like a fill sand? Maybe sand just taken from a sand pit, unrefiend, and used as a topping for a turf area?
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