Fitting and design

Soil pipes, stacks and where new bathrooms can go

Before you commit

Air admittance valves can replace an open vent in some positions, but they need access and correct siting to work.

At a glance

  • Branch length and gradient limits determine WC positions; longer branches need care to avoid losing trap seals.
  • Air admittance valves can replace an open vent in some positions, but they need access and correct siting to work.

How this is actually built

  1. 1

    Branch length and gradient limits determine WC positions; longer branches need care to avoid losing trap seals.

  2. 2

    Air admittance valves can replace an open vent in some positions, but they need access and correct siting to work.

Your questions answered

Can a stack be moved?

It can be relocated, but it is disruptive work affecting several floors and usually reshapes the project budget.

Why does my new bathroom gurgle?

Often a ventilation or trap-seal issue on a new branch rather than a blockage.

Take this further

Related expert guides

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