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New Patio on Old Concrete
Nick Maclaren wrote:
In article , "PK" writes: Yes and no! Sand alone will not make a secure long term base - it will wash out and ants will move it. Er, no. See Cormaic's pages. When done right, it will last for decades and often centuries. For millennia, you need a better construction. Cormaic: The flagstones can be bedded directly onto a coarse, grit sand bed, approx 40mm thick. DO NOT USE BUILDING SAND - it is to soft and can become 'fluid' when waterlogged, consequently moving beneath the flags, causing settlement. The bedding material can be stiffened by the addition of a small quantity of cement, around a 10:1 mix is adequate. This is useful when working in wet areas, or where the movement of ground water could lead to bed migration, and we find it useful beneath the thinner patio flags as it gives the finished pavement a bit more solidity. Refer to Mortars & Concretes Page for details on a cementitious bedding mix. I'd agree a professional paver using sand alone will do a robust job, a first time amateur i'd alaway recommend a lean mix mortar to avond needing to bed each slap to a firm level. pk |
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