Last edited 12 Oct 2020


A pattress is a plywood, or timber board fixed within in a partition to which equipment can be secured, such as ceiling roses, power outlets, basins, wall cabinets and so on.

Confusingly, the term ‘pattress’ can also be used to refer to a container or box (correctly described as a pattress box) that is positioned behind power sockets, light switches and other electrical fittings, and contains wiring, switches and other circuitry. This may sometimes be secured to a timber or plywood pattress.

These boxes can also be referred to as a ‘wall box’ or 'installation box' or, when it is recessed into the wall, a ‘flush box’. If it is installed within timber or plasterboard walls, it can be referred to as a ‘cavity box’,‘plasterboard box’, or 'dry lining box'.

A pattress box can be designed to be either surface-mounted, or can be recessed into a wall or skirting board.

Surface mounted pattress.JPG Recessed pattress.JPG
Surface mounted pattress box Pattress box that will be recessed

Pattress boxes are typically made from metal or plastic. PVC or urea-formaldehyde resin is often used for surface-mounted boxes, while thin galvanised metal is used for recessed boxes.

The generally have 'knockout' sections that can be removed as required to allow cables into the box.

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