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Hollow Walls

Timber-framed cavity wall

A cavity wall with the inner, load-bearing leaf built of timber studding faced with plasterboard. Timber uprights are usually 4in (100mm) wide and 2in (50mm) thick and about l6in (400mm) apart. The side facing the cavity is sheeted with plywood. There is thermal insulation material, such as glass-fibre quilting, between the plywood and plasterboard.

Stud partitioning

This common interior dividing wall is made from a framework of timber studding (upright posts with cross-pieces known as noggins) faced with plasterboard on each side. The posts are usually 3m (75mm) wide and 2in (50mm) thick, spaced about 24in (610mm) apart, and the wall is about 4in (100mm) thick overall. It may, or may not, be load-bearing.

Dry partition wall

Plasterboard panels (Paramount partitioning) are slotted over timber framework. The panels consist of two wallboards bonded to a cellular core of resin-impregnated card. The timber uprights are likely to be about 3ft (910mm) or 4ft (1 .2m) apart and about lin (38mm) wide. The wall is 2in-2in (50-65mm) thick, lightweight and non-load-bearing.

Lath-and-plaster wall

Found in houses built before the 1920s. The plaster, often about 1in (25mm) thick and mixed with horsehair to increase its strength, is bonded to horizontal laths of sawn or split timber. The laths are nailed to timber uprights, usually 4in x 2in (100mm x 50mm) at about l8in (460mm) centres. It the wall is load-bearing, it has diagonal struts between the timber uprights.

Dry-lined wall

A brick or block wall that has a surface layer of plasterboard either stuck directly to the masonry or nailed to a framework of timber battens. The battens are normally either about l6in (400mm) apart with 9.5mm (3/8in) thick plasterboard, or about 24in (610mm) apart with l2.5mm (1/2in) thick plasterboard. There may be insulation material between the masonry and plasterboard.

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