Spacing and Joints Wood Roof Shingles
(1) Shingles shall be spaced approximately 6 mm apart and offset at the joints in adjacent courses not less than 40 mm so that joints in alternate courses are staggered.
Article 9.26.9.4. Ontario Regulation 332/12 Building Code, O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for Ontario, 2021.
Wood shingles
The width of wood shingles varies between a maximum width of 350 mm (14 in.) and a minimum width of 75 mm (3 in.).
Figure 102 shows how to lay a wood shingle roof. As for asphalt shingles, underlay and roofing felt is not usually required, but eave protection is required. Double lay the first shingle course with the upper shingles overlapping the joints in the course beneath and both rows extending about 25 mm (1 in.) beyond the fascia boards at the eaves. This will prevent water from backing up underneath the shingles. Place shingles 6 mm (1⁄4 in.) apart to allow for swelling. Offset the joints between shingles in one course at least 40 mm (19⁄16 in.) from a joint in the course below. Space the joints in succeeding courses so that the joint in one course is not in line with the joints in the two previous courses laid.
Figure 102
Source : Canada Mortgage and Housing Corporation (CMHC)
Note : Wood shingles put a uniform, smooth look over the roof of your house. Wood shingles are made from one piece of wood, which makes them harder to install and stack properly on your roof than when compared to shakes. Also, because of their origins in Europe, most naturally find that there are inconsistencies along their length and width. While it is difficult to determine true age, we can see that overall the integrity of the product as a whole is trending downward as compared to years past.
