| 9.30.2. |
Panel-Type Underlay |
| 9.30.2.1. |
Required Underlay
- 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. (See Sentence 9.30.3.2.(1).)
- 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. (See Article 9.23.15.3.)
- Panel-type underlay shall be provided under ceramic tile applied with adhesive.
|
| 9.30.2.2. |
Materials and Thickness
- Panel-type underlay shall be not less than 6 mm thick and shall conform to
- ANSI A208.1, "Particleboard,"
- CAN/CGSB-11.3-M, "Hardboard,"
- ANSI/HPVA HP-1, "Hardwood and Decorative Plywood,"
- CSA O121, "Douglas Fir Plywood,"
- CSA O151, "Canadian Softwood Plywood,"
- CSA O153, "Poplar Plywood," or
- CSA O437.0, "OSB and Waferboard."
- Panel-type underlay under ceramic tile applied with adhesive shall be not less than
- 6 mm thick where the supports are spaced up to 300 mm o.c., and
- 11 mm thick where the supports are spaced wider than 300 mm o.c.
|
| 9.30.2.3. |
Fastening
- 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.
- 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.
- Staples for panel-type underlay shall
- have not less than a 1.2 mm shank diameter or thickness with a 4.7 mm crown, and
- be not less than
- 22 mm long for 6 mm underlay, and
- 28 mm long for 7.9 mm and 9.5 mm underlay.
|
| 9.30.2.4. |
Joints Offset
- Where panel-type underlay is required to be installed over plywood, OSB or waferboard, the joints in the underlay shall be offset not less than 200 mm from the joints in the underlying subfloor.
|
| 9.30.2.5. |
Surface Defects
- 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.
|