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Applications and solutions

Bathroom and kitchen plumbing

Most of a bathroom’s plumbing is hidden. What sits behind the tiles — and what you see in front of them.

  • Concealed pipes and valves
  • Sanitaryware and fittings
  • Waterproofing and drains
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Overview

Bathrooms and kitchens

Most of a bathroom’s plumbing is hidden: hot and cold supply lines and concealed valve bodies sit inside the wall, waste pipes run below the floor, and a waterproofing layer protects the slab. What you see — mixers, showers, basins, WCs and floor drains — depends on that hidden work being right.

Kitchens follow the same pattern around the sink, with angle valves for appliances and a trap below.

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Key parts and what they do

What is used — and how it works

The main materials and components in this application, and the job each one does.

  • Concealed supply pipes

    Hot and cold lines run inside the wall to each fitting, usually in CPVC or similar pipes.

  • Valves and concealed mixers

    Stop valves isolate each line; a concealed mixer blends hot and cold water for the shower.

  • Sanitaryware

    WCs, basins and cisterns, fixed in place and connected to the supply and soil pipes.

  • Floor traps and waste pipes

    Water seals stop drain smells; sloped waste pipes carry used water to the stack.

  • Waterproofing

    A membrane under the tiles protects the floor slab and the lower walls of wet areas.

  • Kitchen sink and connections

    The sink and tap, angle valves for appliances and a trap below the bowl.

Step by step

The usual order of work

  1. Plan the layout

    Fix the positions of the WC, basin, shower and sink, and the routes of the pipes.

  2. Lay and test the pipes

    Concealed supply and waste pipes are laid, then pressure-tested before they are covered.

  3. Waterproof and tile

    The floor and lower walls are waterproofed, screeded to slope towards the drain, then tiled.

  4. Fit and seal

    Sanitaryware, taps, showers and accessories are fixed and every joint is sealed.

Materials used

Related categories

See it in 3D

Behind the bathroom tiles

Hide the tiles to reveal the concealed pipework, then switch on the water flow.

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Building the 3D scene…
All parts in this scene (10)

  1. A concealed diverter or mixer in the wall controls the shower and spout. Its body is installed before tiling.

    Browse taps, mixers and showers

  2. The concealed body sits within the wall with only the trim plate and handle visible after tiling.

    Browse taps, mixers and showers

  3. The basin connects to hot and cold supplies through angle valves and drains through a bottle trap.

    Browse sanitaryware

  4. WCs connect to a soil pipe and are filled through a cistern or a concealed flush valve.

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  5. A wall-mounted water heater feeds the hot line. Pipes for hot water must be rated for its temperature.

    Browse CPVC pipes and fittings

  6. Supply pipes are chased into the wall and pressure-tested before plastering and tiling.

    Browse CPVC pipes and fittings

  7. Waste pipes from the basin and floor trap and the soil pipe from the WC slope down towards the stack.

    Browse SWR and drainage pipes and fittings

  8. A floor trap with a grating sits at the lowest point of the shower area; the floor slopes gently towards it.

    Browse bathroom accessories and drains

  9. Tiles are fixed with tile adhesive and finished with grout. Anti-skid floor tiles are commonly used in wet areas.

    Browse tiles and flooring materials

  10. Wet areas receive a waterproof coating or membrane on the floor and the lower part of the walls before tiling.

    Browse waterproofing products

Educational visualization only. Layouts, sizes and materials are simplified and are not an engineering drawing, installation guide or guarantee of compatibility. Consult a qualified engineer or plumber for your project.

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