Tempo:
and is extended beyond the subfloor to cover the header joist and the sill plate. The angle cuts of the diagonal approach require more time and materials.
SHEATHING MEMBRANE The sheathing membrane forms part of a second line of defence against the entry of rainwater and may also be, in some cases, a primary component of the air barrier system. Since some moisture may condense in the wall space in winter, the sheathing membrane must be capable of allowing it to diffuse outward to prevent wood decay. Several types of sheathing membrane are commonly used in wood-frame construction:
Building paper is bituminous-impregnated paper that is produced in 915 mm (36 in.) wide rolls and applied over the sheathing in horizontal strips, starting at the bottom of the frame wall. The paper is stapled to the sheathing, and each strip is shingle-lapped over the one beneath it. Spun-bonded polyolefin (SBPO), also known as “Housewrap,” is produced in rolls 2.74 m (9 ft.) wide by up to 45 m (150 ft.) long. It is applied over the sheathing in horizontal strips that cover the height of a storey and is stapled to the sheathing. SBPO is strong and flexible enough to be turned into window and door openings and integrated with the moisture management features at the openings. Self-adhesive (“peel-and-stick”) membranes are used in areas subject to large amounts of water such as at door and window sills and heads. Peel-and-stick membranes are produced in 915 mm (36 in.) wide rolls.
They are strong, flexible and can be formed to make sill dams, seal the joints in other sheathing membranes, and seal the joints between sheathing membranes and flashings.
Liquid-applied membranes are usually trowelled over the sheathing, with vertical grooves for drainage. They provide both an adhesive and a moisture barrier for the polystyrene insulation boards used in exterior insulation finish systems (EIFS).
Refer to Chapter 5 for more information concerning the design and installation of moisture barriers.
EXTERIOR CLADDING Aside from contributing to house appearance and durability, exterior cladding is an important part of the water penetration control strategy. Common types of cladding are made of metal, vinyl, hardboard, fibre-cement board or lumber siding; panel siding made of plywood, OSB, hardboard; wood shingles or shakes; stucco; and masonry cladding such as brick and stone. Most siding can be affected by moisture and must be kept at least 200 mm (8 in.) away from the ground and at least 50 mm (2 in.) from an adjoining roof surface. Methods of flashing over window and door openings and between different types of wall covering are described in Chapter 14.
Metal and Vinyl Sidings Metal and vinyl sidings are factory finished and manufactured in many shapes and patterns. They are made to interlock so that only the upper side of the siding is nailed, while the bottom edge is locked to the upper part of the
SHEATHING MEMBRANE The sheathing membrane forms part of a second line of defence against the entry of rainwater and may also be, in some cases, a primary component of the air barrier system. Since some moisture may condense in the wall space in winter, the sheathing membrane must be capable of allowing it to diffuse outward to prevent wood decay. Several types of sheathing membrane are commonly used in wood-frame construction:
Building paper is bituminous-impregnated paper that is produced in 915 mm (36 in.) wide rolls and applied over the sheathing in horizontal strips, starting at the bottom of the frame wall. The paper is stapled to the sheathing, and each strip is shingle-lapped over the one beneath it. Spun-bonded polyolefin (SBPO), also known as “Housewrap,” is produced in rolls 2.74 m (9 ft.) wide by up to 45 m (150 ft.) long. It is applied over the sheathing in horizontal strips that cover the height of a storey and is stapled to the sheathing. SBPO is strong and flexible enough to be turned into window and door openings and integrated with the moisture management features at the openings. Self-adhesive (“peel-and-stick”) membranes are used in areas subject to large amounts of water such as at door and window sills and heads. Peel-and-stick membranes are produced in 915 mm (36 in.) wide rolls.
They are strong, flexible and can be formed to make sill dams, seal the joints in other sheathing membranes, and seal the joints between sheathing membranes and flashings.
Liquid-applied membranes are usually trowelled over the sheathing, with vertical grooves for drainage. They provide both an adhesive and a moisture barrier for the polystyrene insulation boards used in exterior insulation finish systems (EIFS).
Refer to Chapter 5 for more information concerning the design and installation of moisture barriers.
EXTERIOR CLADDING Aside from contributing to house appearance and durability, exterior cladding is an important part of the water penetration control strategy. Common types of cladding are made of metal, vinyl, hardboard, fibre-cement board or lumber siding; panel siding made of plywood, OSB, hardboard; wood shingles or shakes; stucco; and masonry cladding such as brick and stone. Most siding can be affected by moisture and must be kept at least 200 mm (8 in.) away from the ground and at least 50 mm (2 in.) from an adjoining roof surface. Methods of flashing over window and door openings and between different types of wall covering are described in Chapter 14.
Metal and Vinyl Sidings Metal and vinyl sidings are factory finished and manufactured in many shapes and patterns. They are made to interlock so that only the upper side of the siding is nailed, while the bottom edge is locked to the upper part of the
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