Drainage
Inspection chambers, soakaway crates, geotextile membrane, underground drainage fittings, and channel drains are the below-ground products that move foul water to the sewer and surface water to a soakaway, and which building control inspects every joint of.
Bottle Gully: The Trapped Ground-Level Fitting That Takes Your Rainwater Downpipe
UK guide to bottle gullies: the trapped surface-water fitting under a downpipe, bottle vs back-inlet, the 110mm outlet, setting it in concrete, and clearing silt.
Channel Drain (Threshold Drain): The Strip That Stops Your New Bifolds Flooding the Kitchen
UK guide to channel drain at flush thresholds. ACO ThresholdDrain, AS350, BrickSlot. Installation, Building Regs Part M and H, outlet routing, costs from £29/m.
Geotextile Membrane: The Filter Fabric That Keeps Soakaways and Sub-Bases Working
UK guide to geotextile membrane for soakaways and driveway sub-bases. Why it isn't DPM, why Wickes weed fabric won't do, GSM grades, prices, and 300mm overlap rule.
Plastic Inspection Chambers: The Access Points That Stop Your Drains Becoming a Nightmare
UK guide to plastic inspection chambers: 320mm vs 450mm sizes, BS EN 124 cover ratings, Part H spacing rules, installation, and prices from £45 per chamber.
Soakaway Crates: The Plastic Cubes Your Extension Roof Drains Into
Complete UK guide to soakaway crates: Part H sizing rules, BRE Digest 365 percolation test, distance limits, installation steps, and prices from £28 per crate.
110mm Underground Drainage Pipe and Fittings: The Orange Pipe That Carries Everything Downhill
UK guide to 110mm orange uPVC underground drainage pipe and fittings: Part H gradients, push-fit only, fittings inventory, prices from £4.75 per coupler.