Fasteners Asphalt Shingles on Slopes of 1 in 3 or Greater
(1) Except as provided in Sentence (2), shingles shall be fastened with at least four nails or staples for 1 000 mm wide shingles so that no nails or staples are exposed.
(2) Where staples with an 11 mm crown are used, shingles shall be fastened with at least six staples.
(3) Fasteners may be reduced for narrower shingles in proportion to the width of the shingle or when shingles incorporating interlocking devices are used.
(4) Fasteners referred to in Sentences (1) and (2) shall be located 25 mm to 40 mm from each end of each strip shingle with other fasteners equally spaced between them.
(5) Fasteners referred to in Sentences (1) and (2) shall be located not less than 12 mm above the tops of the cutouts.
Article 9.26.7.4. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
Staple or Nails
Staple or nail each shingle strip in place with four fasteners located above the exposed portion of the shingle. Use four large-head roofing nails per strip that are long enough to penetrate at least 12 mm (1⁄2 in.) into the roof sheathing.
Source : Canada Mortgage and Housing Corporation (CMHC)
