RCABC - CONSUMER GUIDE TO ROOFING
STANDARD OR STEEP SLOPE APPLICATION 1:3 (4" in 12") or steeper This specification is intended to meet or exceed the requirements of the Building Code and shall be installed to CAN3-A123.51-M85 (R2006) Asphalt Shingle Application on Roofs 1:3 and steeper. MATERIALS
Asphalt Shingles – manufactured to CAN/CSA-A123.1-98 (R2004) for organic felt shingles or CAN/CSA-A123.5-98 (R2004) for fibreglass felt shingles. Nails – large-head corrosion resistant roofing nails conforming to CSA B111; electro-galvanized, hotdipped galvanized steel, aluminum, or stainless steel. Sheet Metal – minimum 0.56 mm (26 gauge) galvanized iron, 0.80 mm (0.032") aluminum, or 0.56 mm (0.0216", 16 oz) copper. Roofing Cement – asphalt-base conforming to CGSB 37-GP-5Ma. Eave Protection self-adhesive, rubberized asphalt sheet material (see Accepted Materials List of the RGC Roofing Practices Manual); or one ply No. 50 asphalt coated roofing sheet CSA A123.2 M1979; or one ply No.30 non-perforated felt conforming to CSA A123.3-M (when allowed by Municipal requirements); or two plies No.15 perforated asphalt-saturated felt conforming to CSA A123.3 M1979, cemented together with lap cement. Valley Materials – sheet metal and/or minimum 3.7 mm thick SBS granulated modified bituminous membrane conforming to CAN/CGSB 37-GP-56M. Lap cement conforming to CGSB 37-GP 4M. Underlayment – A minimum of No. 15 non-perforated asphalt saturated felt conforming to CSA A123.3 M1979 and/or ASTM D226-95 or manufacturer and RGC accepted eave protection or manufacturer and RGC accepted proprietary underlayment (see Tab 3.15). Water diverter Flashing – Minimum 0.56 mm (26 gauge) galvanized iron, 0.80 mm (0.032") aluminum, or 0.56 mm (0.0216", 16 oz) copper. Cladding Screws – Minimum No. 8 (⅛") with rubber gasket grommet or washer made of metal compatible and corresponding in colour to metal flashing material. APPLICATION Asphalt Shingles shall be installed to CAN3-A123.51-M85 (R2006) Asphalt Shingle Application on Roofs 1:3 and steeper. Deck Requirements Wood decks shall be constructed of plywood, securely fastened to supports. Oriented strand or nonveneer panels are not recommended as acceptable deck materials. Plywood for roof decks shall conform, as a minimum, to the requirements of the Building Code; but it is strongly recommended, for better nailing and less deflection, that the following be used: 12.7 mm (½") thick when supported at 400 mm (16") o/c or 15.9 mm (⅝") thick when supported at 600 mm (24") o/c (refer to RGC Guarantee Standards - A2.4 Wood Decks). Knotholes and cracks in decks shall be considered defects and must be covered with sheet metal nailed in place. Wood decks constructed of shiplap and dimensional lumber shall be overlain with sheathing that conforms to CSA 0151-04, Canadian Softwood Plywood, Grade C or better; or CSA 0121-M 1978
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