110mm Underground Drainage
110mm underground drainage pipe is the standard size for a house foul or surface water run below ground. Lengths come in 3m and 6m with bends, junctions, gullies and couplers, plus reducers where a 160mm run steps down. Access it through an inspection chamber.
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Aquaflow 600x450mm Double-Seal Galvanised Manhole Cover & Frame
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Choosing 110mm Underground Drainage
Frequently Asked Questions
110mm covers almost every house run, foul and surface water alike. 160mm is for a larger building, a shared run serving several properties, or where an existing 160mm line has to be matched. Oversizing is not a safe default — a pipe running part full at low velocity is more likely to silt up.
As a general guide, a pipe under a garden or footpath is laid with at least 600mm of cover, and at least 900mm under a driveway or anywhere vehicles run. Shallower runs need protection such as a concrete surround. Depths, falls and bedding are covered by the Building Regulations, so confirm with building control before you backfill.
Push fit seals on a ring, so a run can be dismantled and reused and there is no curing time — useful for a repair, or anywhere access stays open. Solvent weld is cemented rigid at every joint, which suits a stack that will be boxed in or a run sealed behind plasterboard, where a creeping seal is a real problem.
Put an inspection chamber at every junction and every change of direction, and avoid tight turns — two 45 degree bends take a corner better than one 90. Keep chambers accessible at finished ground level with a cover that lifts by hand. A run you cannot rod is a run that gets dug up.