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 Cedar
Shake Installation
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In
shake application, spaced sheathing is usually 1" x 6" boards spaced on
centers equal to the weather exposure at which the shakes are to be
laid - but never more than 7½" for 18" shakes and 10" for 24" shakes on
roof installations.
When 1" x 4" spaced sheathing is installed at 10" on center, additional
1" x 4" boards must be installed between the sheathing boards. A solid
deck is recommended in areas where wind-driven snow is encountered.
Roofing felt interlay between the shake courses is required - whether
the sheathing is spaced or solid. The felt interlay acts as a baffle
that prevents wind-driven snow or other foreign material from entering
the attic cavity during extreme weather conditions. The interlays also
increase the roof's insulation value.
Special care should be taken when installing the felt interlays over
spaced sheathing. This will ensure that an effective baffle is formed
(Figure 3). The felt should be applied over the top portion of the
shakes and extend on to the spaced sheathing. Position the bottom edge
of the felt at a distance above the butt equal to twice the weather
exposure.
To be an effective baffle, the top of the felt must rest on the
sheathing. The shakes should be placed so that the nails are driven
through the upper portion of the sheathing board with the top of the
roofing felt attached to the lower portion.
Shake Application
Shakes, like shingles, are normally applied in straight, single
courses. The following application details (Figure 5 below) must be
observed:
- The starter course may be
one or two layers of cedar shingles or shakes overlaid with the desired
shake. A 15" shake is made expressly for starter and finish courses.
- Butts of first course shakes
should project 1½" beyond the fascia.
- An 18" wide strip of No. 30
roofing felt (or No. 15 felt depending upon code requirements) should
be laid over the top portion of the shakes and extend on to the
sheathing. The bottom edge of the felt should be positioned above the
butt of the shake at a distance equal to twice the weather exposure.
For example, 24" shakes laid with 10" exposure would have felt applied
20" above the butt. The felt will cover the top 4" of the shakes and
extend up 14" onto the sheathing.
- Spacing between adjacent
shakes should be a minimum of 3/8" and a maximum of 5/8".
- Joints between shakes should
be offset 1½" over adjacent courses.
- Straight-split shakes should
be laid with the froe-end (the end from which the shake has been split
and which is smoother) towards the ridge.
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Application Instructions for applying Watkins Cedar Shakes as
a Class "A" Roof Covering. (58Kb
PDF)
Application
Instructions for applying Watkins Cedar Shakes as a Class "C"
or "B" Roof Covering. (57Kb PDF)
Shake
and Shingle Application Handbook (3.5MB
PDF) which includes:
- Product Description
- General Roof Design Details
- Mansard Roof Details
- Low Slope Roof Details
- Hip and Ridge Details
- Roof Juncture Details
- Roof Valley Flashing Details
- Roof Projection Flashing
Details
- Ventilation Details
- Vapor Barrier Guidelines
- Specialty Roof Deck Details
- Cold Weather Roof System
Details
- General Wall Design Details
- Coverage and Exposure Tables
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