How thick is a dry-lined wall?

The thickness of a dry-lined wall depends on the plasterboard, fixing method, frame and insulation used. Standard plasterboard is commonly 9.5 mm or 12.5 mm thick, although specialist boards can be thicker. When plasterboard is fixed directly to masonry with adhesive, the completed lining may add around 20 to 40 mm to the wall. A timber or metal framed system takes up more space because it includes studs, a cavity, insulation and plasterboard. These systems may add 75 mm, 100 mm or more. Double layers of board, thicker insulation and acoustic construction can increase the depth further. The wall build-up should be planned according to thermal performance, sound reduction, fire resistance, strength and the amount of internal space available.