Concrete Paving Slabs – How to Lay a Patio Part Two - Planning the Fall

Patios need to be designed with a fall so that water is allowed to run off, rather than puddle on the surface. A fall is a slight gradient and should be hardly noticeable. The standard ratio for a fall is 1:80 (1 unit of fall for every 80 units of distance). For example, to calculate the fall for a patio that is 5m in length you would simply need to divide 5 by 80 which would give you 0.0625. This would mean your 5 metre patio should have a total fall of 0.0625m or 6.25cm. This means that the patio should slope very slightly so that one end of the patio is a total 6.25cm lower than the other.

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