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Asphalt shingles shall overhang roof edges by not less than 12 mm according to the Building Code; they shall not overhang the roof edge to the extent that they curl.

Shingles used in local repairs shall be of similar type, texture and colour. Variation resulting from fading or different dye lot is acceptable.

Asphalt shingle surfaces need not be completely flat. The roof sheathing shall provide an even surface free from thickness variations, holes, and debris that produce visible irregularities in the finished roof. The roof shall be viewed from a normal viewing position on the ground without magnification by reflected light.

Roofing nails shall be covered by overlapping shingles or by sealing.

Performance/Condition: Safety straps intended to be used only during construction shall not be left on the roof.

Roll roofing may blister under normal weather conditions. Blisters that result in water penetration are not acceptable.

Eavestroughs and downspouts shall not leak at joints.

Eavestroughs shall be installed in accordance with municipal requirements (where applicable) with a slope to downspouts or drains. Eavestroughs may overflow during a rain as a result of converging water flows.

Where provided, eavestroughs and downspouts shall collect water from the roof and drain it to grade. Where downspouts are not connected to a sewer, extensions shall be provided to carry rainwater away from the building in a manner that will prevent soil erosion.

Eavestroughs shall generally slope to drains.

Skylights shall be installed in accordance with the manufacturer’s specifications and shall not allow water penetration.

Attic vents shall be installed in accordance with the Building Code, and prevent the entry of rain, snow and insects.

Roofs and their flashings at intersections shall prevent water penetration and shall be installed in accordance with the Building Code.