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Solid Walls

Cavity wall

A wall round the outside of a house built since the late 1920s. It is made up of two independent leaves separated by a cavity 2in (50mm) wide, and is 11in (280mm) thick overall. The outer leaf may be brick, natural stone or reconstituted stone. The inner leaf, which supports the ceiling joists and roof structure, may be built of bricks or building blocks or could be timber-framed.

Solid outer wall

A wall round the outside of the house, built of solid brickwork or stone. Brick walls are two or three bricks thick - 9in (230mm) or l3in (345mm) and often have a damp-proof course of slate or engineering bricks just above soil level on the outside. Stone walls are 12in-2Oin (300mm-5l0mm) thick and rarely have a dampproof course. Solid walls are normally found only in houses built before the 1920s.

Solid internal wall

An interior dividing wall that is constructed from a single leaf of either bricks or lightweight concrete or clay building blocks. The wall is usually covered with a plaster layer 1/2in-1in (l3mm-25mm) thick on both sides. The overall thickness of the wall is 5in-6in (l25mm-l50mm).
Some solid internal walls are load-bearing which means supporting structural joists, and some are non-load-bearing.

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