Sheathing And Covering Roofs 7

Shingling Roofs With Asphalt Shingles


Basic Construction And Carpentry Techniques Home



A metal drip edge is nailed to the rakes and eaves prior to shingling. The nails are spaced 8 to 10 inches (200 to 250 mm) apart. An asphalt saturated felt tar paper underlayment, such as no. 15 asphalt saturated felt, is placed over the roof surface. All horizontal joints must have a 2 inch toplap and end joints a 4 inch sidelap. An optional 36 inch metal eaves flashing layer can be installed along the lower roof edge. A chalk line is snapped down the roof centre to act as a guide for shingle vertical alignment. Shingles are placed from each side of the line towards the roof rakes. Horizontal chalk lines are used to position the shingles along the roof. A 9 inch (225 mm) or wider asphalt starter strip, or a row of square butt shingles are used as a starter course along the lower roof edge. If shingles are used, cut off 3 inches (75 mm) from the side of the shingle that is placed closest to the rake. The shingle cutouts or slots will be staggered when the first shingle course is placed over the starter course. Place the starter course over the metal drip edge (or drip cap) and eaves flashing with the tabs pointing up the roof slope. Extend the shingles 1/4 to 3/8 inches over the roof edge. Nail the starter strip with asphalt roofing nails 3 to 4 inches (75 mm to 100 mm) from the lower roof edge and make sure the nails are not going to be exposed by the slots in the shingle layer above it. The first course is started with a full shingle and placed over the starter course with the tabs pointing down the roof. The remaining shingle courses have their tabs pointing down slope also and are staggered to cover the nails of the previous courses. To stagger a shingle course with 2 tabs per shingle, cut off 1/2 tab (150 mm) for the first shingle of the second course, 1 full tab for the starting shingle of the third course, 1 1/2 shingles for the starting shingle of the fourth course, and so on. To stagger a shingle course with 3 tabs per shingle, cut off 1/3 tab (100 mm) from the first shingle of the second course, 2/3 tab from the first shingle of the third course, 1 full tab from the first shingle of the fourth course, and so on. Shingles are fastened to the roof by stapling or nailing 1/2 of an inch (12 mm) above the shingle slot. Roof valleys are shingled like wood shingle open valleys or closed valleys. Shingles on one side of the valley centre line are placed over a valley liner of rolled roofing and extended up the opposite side by at least 12 inches (300 mm). Shingles are then placed in a continuous strip of roofing cement on the other slope after being cut along the valley centre line. Hips and ridges are capped with individual shingles. They are folded over the hips and ridges and nailed so that the next shingle placement covers the nails of the one below it.





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 Sheathing And Covering Roofs Links

1. Sheathing With Plywood Panels.
2. Shingling Roofs With Wood Shingles (Overhang).
3. Shingling Roofs With Wood Shingles (Sidelap).
4. Shingling Roof Hips With Wood Shingles.
5. Shingling Roof Open Valleys With Wood Shingles.
6. Chimney And Dormer Flashing, And Chimney Saddle.
7. Shingling Roofs With Asphalt Shingles.

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Written and maintained by
Ronald Hunter
           
  All images and text are copyright Ronald Hunter 2005 to 2011.
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