Above Ground Drainage

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Buying guide: Above Ground Drainage

Above ground drainage carries waste water from sinks, basins, baths, showers, toilets and appliances, and rainwater from the roof, down to the underground drains. It covers soil and vent pipe, waste pipe, traps, pan connectors, air admittance valves, and rainwater gutters, downpipes and their fittings.

Soil and vent

Soil pipe takes toilet waste and is most often 110mm outside diameter, with 82mm and 160mm sizes for particular jobs. Air admittance valves let air into the stack so trap seals are not pulled out, and can reduce the need for an open vent through the roof; those used under Building Regulations guidance should conform to BS EN 12380.

Waste pipe and traps

Waste pipe comes in 32mm, 40mm and 50mm nominal sizes. Solvent weld and push-fit systems have different outside diameters, so they are not interchangeable; join them with a universal or compression adaptor. As a guide, Approved Document H suggests a 32mm trap for basins and 40mm for baths, showers, sinks and washing machines, with a 75mm water seal for basins, sinks and washing machines and 50mm for baths, showers and toilets.

Rainwater

Gutters come in half round, square, ogee and deep high-capacity profiles, with round or square downpipes. Profiles and joints differ between manufacturers, so match the system and colour when extending or repairing.

Choosing the right parts

Measure the existing pipe's outside diameter, note the joint type and colour, and keep to one system. New work should comply with Building Regulations Part H. For pipework below ground, see below ground drainage.

About Above Ground Drainage

Browse above ground drainage products within the Drainage range of our Heating & Plumbing department at BHL. Brands with products here include Wavin, McAlpine Plumbing and Marley Plumbing & Drainage.

Brands

Brands with products in Above Ground Drainage at BHL include those listed below, each linked to its own brand page.

Finding products in Above Ground Drainage

Above Ground Drainage has no sub-categories: all of its products are listed on this page.

Brands with products in above ground drainage include Wavin, McAlpine Plumbing and Marley Plumbing & Drainage, and each brand page linked on this page lists that maker's products at BHL.

Above Ground Drainage sits within Drainage alongside Cast Iron Drainage and Below Ground Drainage.

Above Ground Drainage FAQs

What does the Above Ground Drainage range at BHL include?

Products from the brands linked on this page.

Which brands appear in above ground drainage at BHL?

Brands with products here include Wavin, McAlpine Plumbing and Marley Plumbing & Drainage. Each name links to the brand's own page.

How do I find a specific above ground drainage product?

Narrow the list first: the brand pages linked on this page each hold a smaller set of above ground drainage products, one manufacturer's.

Related categories

More brands in above ground drainage: Aspen Pumps, Wadeint and Flo Plast.

Back to Drainage, or continue to Cast Iron Drainage and Below Ground Drainage.