9.27.8.

(1) Asbestos-cement shingles and sheets shall conform to,

(a) CAN/CGSB-34.4-M, “Siding, Asbestos-Cement, Shingles and Clapboards”,

(b) CAN/CGSB-34.5-M, “Sheets, Asbestos-Cement, Corrugated”,

(c) CAN/CGSB-34.14-M, “Sheets, Asbestos-Cement, Decorative”,

(d) CAN/CGSB-34.16, “Sheets, Asbestos-Cement, Flat, Fully Compressed”,

(e) CAN/CGSB-34.17-M, “Sheets, Asbestos-Cement, Flat, Semicompressed”, or

(f) CAN/CGSB-34.21-M, “Panels, Sandwich Asbestos-Cement with Insulating Cores”.

(1) Asbestos-cement shingles shall weigh not less than 8.06 kg/m².

(2) Asbestos-cement sheet shall be not less than,

(a) 4.75 mm thick where applied to studs spaced not more than 400 mm o.c., and,

(b) 6 mm thick where applied to studs spaced not more than 600 mm o.c.

(3) Where applied over sheathing, the thickness of asbestos-cement sheet shall be not less than 3.15 mm.

(1) Asbestos-cement shingles shall be fastened with nails located not less than 25 mm above the exposure line.

(1) Asbestos-cement shingles shall be installed so that vertical joints in succeeding courses are staggered.

(2) Asphalt-coated backer strips shall be installed behind each vertical joint.

(3) Shingles referred to in Sentence (1) shall have not less than a 25 mm head lap.

(1) Vertical joints of asbestos-cement panels shall be protected with batten strips, caulking or other suitable method.

(2) Horizontal joints of asbestos-cement panels shall be lapped, flashed, caulked or otherwise suitably protected.