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Interior Wall and Ceiling Finishes
Interior wall and ceiling finishes should have a pleasing appearance and resist normal wear and tear. The most common interior finish used in house construction is painted gypsum board (drywall). Plywood, hardboard, simulated veneer hardboard and lumber are also used occasionally.
GYPSUM BOARD FINISH Gypsum board is the most widely used interior finish because of its speed of installation, low cost, consistent result and fire resistance. Several types have special characteristics such as additional fire resistance or water resistance for use in humid areas such as bathrooms. Various accessories such as corner beads and coves are also available. Gypsum board is a sheet material composed of gypsum filler between two layers of paper. Sheets are 1.22 m (4 ft.) wide and are supplied in various lengths, 2.44 m (8 ft.)
and longer. The edges along the length of the sheet are tapered on one face to receive joint compound and tape. To obtain an even surface, install gypsum on studs and ceiling joists and furring strips that are straight and aligned. Although 9.5 mm (3⁄8 in.) thick gypsum board may be used on walls with support spacings up to 400 mm (16 in.) on centre when the boards are oriented perpendicular to the framing, 12.7 mm (1⁄2 in.) gypsum board is more commonly used because of its extra stiffness and strength. Where supports are spaced at 600 mm (24 in.) on centre, the minimum thickness should be 12.7 mm (1⁄2 in.). When gypsum board supports insulation, it must be at least 12.7 mm (1⁄2 in.) thick. Some ceiling gypsum board is specially designed to resist sagging when water-based textured finishes are applied to a ceiling. A 12.7 mm (1⁄2 in.) panel can be installed perpendicular to supports at spacings up to 600 mm (24 in.).
Interior wall and ceiling finishes should have a pleasing appearance and resist normal wear and tear. The most common interior finish used in house construction is painted gypsum board (drywall). Plywood, hardboard, simulated veneer hardboard and lumber are also used occasionally.
GYPSUM BOARD FINISH Gypsum board is the most widely used interior finish because of its speed of installation, low cost, consistent result and fire resistance. Several types have special characteristics such as additional fire resistance or water resistance for use in humid areas such as bathrooms. Various accessories such as corner beads and coves are also available. Gypsum board is a sheet material composed of gypsum filler between two layers of paper. Sheets are 1.22 m (4 ft.) wide and are supplied in various lengths, 2.44 m (8 ft.)
and longer. The edges along the length of the sheet are tapered on one face to receive joint compound and tape. To obtain an even surface, install gypsum on studs and ceiling joists and furring strips that are straight and aligned. Although 9.5 mm (3⁄8 in.) thick gypsum board may be used on walls with support spacings up to 400 mm (16 in.) on centre when the boards are oriented perpendicular to the framing, 12.7 mm (1⁄2 in.) gypsum board is more commonly used because of its extra stiffness and strength. Where supports are spaced at 600 mm (24 in.) on centre, the minimum thickness should be 12.7 mm (1⁄2 in.). When gypsum board supports insulation, it must be at least 12.7 mm (1⁄2 in.) thick. Some ceiling gypsum board is specially designed to resist sagging when water-based textured finishes are applied to a ceiling. A 12.7 mm (1⁄2 in.) panel can be installed perpendicular to supports at spacings up to 600 mm (24 in.).
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