What fall should a patio have?
A patio should slope away from the building to drain, at a fall of around 1 in 80. That is roughly a 12mm drop per metre, so a 3 metre patio falls about 40mm across its width.
To shed rainwater and stop pooling, a patio should fall away from the house at around 1 in 80, which is about 12mm of drop for every metre. Over a three metre patio that gives roughly a 40mm fall from the wall to the outer edge.
Keep the finished paving at least 150mm below the damp proof course, and direct water towards a drainage channel or a suitable soakaway rather than towards the building.
Otis helps a customer plan the paving, sub base and any drainage channel, checks stock and prices the materials for the account.
General guidance for the trade. Always follow current Building Regulations, manufacturer instructions and the specifics of the job.
See what Otis would capture for you
Book a strategic call and we will model it against your own numbers.