9.30.2.

(1) A panel-type underlay shall be provided under resilient flooring, parquet flooring, ceramic tile, felted-synthetic-fibre floor coverings or carpeting laid over lumber subflooring.

(2) A panel-type underlay shall be provided under resilient flooring, parquet flooring, felted-synthetic-fibre floor coverings or carpeting on panel-type subflooring whose edges are unsupported.

(3) Panel-type underlay shall be provided under ceramic tile applied with adhesive.

(4) Panel-type underlay shall be provided under resilient flooring on waferboard or strandboard subflooring.

(1) Panel-type underlay shall be not less than 6 mm thick and shall conform to,

(a) ANSI A208.1, “Particleboard, Mat-Formed Wood”,

(b) CAN/CGSB-11.3-M, “Hardboard”,

(c) CSA O115-M, “Hardwood and Decorative Plywood”,

(d) CSA O121-M, “Douglas Fir Plywood”,

(e) CSA O151, “Canadian Softwood Plywood”,

(f) CSA O153-M, “Poplar Plywood”, or

(g) CSA O437.0, “OSB and Waferboard”.

(1) Panel-type underlay shall be fastened to the subfloor with staples, annular grooved flooring nails or spiral nails, spaced not more than 150 mm o.c. along the edges and 200 mm o.c. both ways at other locations.

(2) Nails for panel-type underlay shall be not less than 19 mm long for 6 mm thick underlay and 22 mm long for 7.9 mm thick underlay.

(3) Staples for panel-type underlay shall,

(a) have not less than a 1.2 mm shank diameter or thickness with a 4.7 mm crown, and

(b) be not less than,

(i) 22 mm long for 6 mm underlay, and

(ii) 28 mm long for 7.9 mm and 9.5 mm underlay.

(1) Where panel-type underlay is required to be installed over plywood, or OSB or waferboard, the joints in the underlay shall be offset at least 200 mm from the joints in the underlying subfloor.

(1) Underlay beneath resilient or ceramic floors applied with an adhesive shall have all holes or open defects on the surface patched so that the defects will not be transmitted to the finished surface.