Roofing General Application Data (continued)
Hips and Ridges
- All Certi-label™ shake/shingle hips and ridges shall be of alternate overlap type applied at the same exposure as field of roof and with nails long enough to penetrate into sheathing at least 3/4". Install a strip of felt, eave protection material or metal over hip or ridge under the ridge or hip cap. If longer or shorter ridge cap is used, adjust exposure accordingly.
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Valleys
- Certi-label™ shakes/shingles extending into the valley shall be sawed to the proper miter.
- Do not lay shakes or shingles with grain parallel with the centerline of valleys.
- All valleys shall be installed with Certi-label™ shakes/shingles lapping the valley flashing not less than 7"on each side.
- On Certi-label™ shingle roofs of less than 6:12 slope, flashing should extend at least 11" on each side.
- For Certi-label™ shakes, metal valley sheets shall be center-crimped; of 20" minimum width; underlaid with a strip of Type 30 roofing felt over the sheathing, and coated with a metal paint.
- Valley metals that have proved reliable in a particular geographic region should be selected. Copper flashing: check with local authorities on the durability of copper valleys in your area.
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Fasteners - Installation
- Nails shall be driven flush but not so that the nail head crushes the wood. They shall be placed approximately 3/4" to 1" from the side edges of the shakes/shingles and approximately 1 1/2" above the butt line of the following course.
- Each Certi-label™ roof shake/shingle shall be secured with two full-driven, corrosion-resistant fasteners. (Specify size.)
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Fasteners - Shingles
- Use 3d "box" nails for new roofs with 16" and 18" shingles.
- Use 4d "box" nails for new roofs with 24" shingles.
- Use 5d "box" nails for over-roofing with 16" and 18" shingles, and for hips and ridges.
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Fasteners - Shakes
- Use 5d "box" nails for new roofs with 18" straight-split shakes.
- Use 6d "box" nails for new roofs with 18" and 24" handsplit-and-resawn shakes.
- Use 5d "box" nails for new roofs with 24" tapersplit shakes.
- Use 6d "box" nails for new roofs with 18" and 24" taper-sawn.
- 6d nails are usually adequate for Certi-label™ shakes, but longer nails shall be used as Certi-label™ shake or shingle thickness or weather exposure dictates.
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Fasteners - Technical
- Certi-label™ roof shakes and shingles shall be secured with with corrosion-resistant, hot-dipped zinc-coated nails or aluminum or stainless steel nails or staples - type 304 0r 316. Fasteners shall have a minimum penetration of 3/4" into the sheathing. For sheathing of less than 1/2" thickness, the fasteners shall extend through the sheathing.
- Always ask the treatment company which fasteners are recommended for use with their pressure-treated Certi-label™ shakes or shingles. Some fasteners are not compatible with treated material.
- Ensure that fasteners used are accepted by your local Building Official.
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