Bundle #4 Grade 18" Perfection Western Red Cedar Shingles

#4 Grade 18" Perfection Western Red Cedar Undercourse Sidewall Shingles are the perfect utility-grade option for the undercourse of your sidewall shingle applications.

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#4 Grade 18” Perfection Western Red Cedar Undercourse Sidewall Shingles are specifically milled as a utility-grade product intended for the undercoursing of Cedar Shingle siding. This product is not intended to be used as a roofing material. Instead, this product is ideal for starter course rows when using the single-course method of shingle installation. It is also perfect for standard undercoursing when using the double-course method.

Features & Benefits of Western Red Cedar Shingles:
• Extreme Durability – Cedar Shingles easily withstand harsh weather conditions including heavy wind, rain, and hail.
• Longevity – Western Red Cedar is known as one of the most durable softwoods. With proper maintenance, Cedar Shingles can beautify your home for decades.
• Energy Efficiency – Cedar offers excellent insulation for your home. While maintaining a low carbon footprint, Cedar will keep your house warmer during cold months, while allowing your home to breathe and stay cooler during the warmer months.
• Termite Resistance – Western Red Cedar is naturally resistant to termites.
• Ease of Installation - Cedar Shingles are simple to install and come pre-bundled for easy jobsite transport.
• Versatility – Western Red Cedar Shingles can be used with many different architectural styles, affording you the option of a home covered in beautiful Cedar wood, or simply a small rustic accent area on an otherwise traditional home.
• Adaptability – Cedar Shingles are manufactured to be used on both interior and exterior wall surfaces.

Product Specifications:
• Packaging: This product is bundled in 32-running foot bundles.
• Length: 18" (Perfection)
• Grade: #4 Grade. Non-bureau grading. Unlimited Defects, Flat-Grain and Sapwood Allowed
• Texture: Natural (light rough texture)
• Thickness: 5/2-1/4" (5 shingle “butts” stacked together should measure 2 ¼” thick)
• Width: 17" maximum exposure, 2 1/2" minimum exposure

Product Resources:
Cedar Shake and Shingle Product Selection Guide
Cedar Shake and Shingle Specification Guide
Basics Guide for Cedar Shakes and Shingles

Estimating Cedar Shingles:
Please ensure you have the following information when estimating wall coverage for cedar shingles:
1. Size in square feet of the wall area you are trying to cover.
2. Application and exposure to be used.
3. Product type used.
4. Amount of product in each box or bundle.

More Information
SpeciesWestern Red Cedar
Shingle Application Undercoursing
Shingle GradeNo. 4 Undercoursing
Shingle Length 18" (Perfection)
Shingle ProfileTaper Sawn
Shingle Texture Natural Texture
Guides / Product Info

Additional Technical Resources for 18” Perfection Western Red Cedar Shingles:
Guide to Certi-Grade 18" Perfection Shingles Grading Rules
Western Red Cedar Sidewall Finishes/Coatings Options

Application Notes:
• Good workmanship is crucial to the integrity of any sidewall system. Installers should read the CSSB Wall Manual carefully and ensure that they follow proper workmanship practices.
• Western Cedar shingles and shakes are applied on walls differently than on roofs. The major difference is in permissible weather exposures. On walls, the maximum weather exposure is greater than it is on roofs.
• A given area of wall will require less material than the same area of roof.

Finishing Cedar Shingles:
• Use oil-based stains only. To hasten the weathering process, apply a bleaching oil finish.
• Generally finish products immediately after installation, provided that the moisture content is appropriate for both the finish product being used and your locale. If the finish is not applied promptly, adhesion can be compromised (unless additional surface preparation is undertaken).
• If you have installed an unfinished shingle, apply your finish before rain and other moisture are absorbed. Ensure that high humidity concerns have been accounted for.
• Drying time varies from region to region. Excessive moisture will limit finish adhesion.
• If you clean the surface prior to finishing, ensure that it is allowed to dry to the finish manufacturer's recommended moisture content level before applying the new finish.

• Each Western Cedar shingle should be applied with two fasteners.
• Nails must be stainless steel Type 316 in locations within fifteen (15) miles of salt water.
• For locations outside the salt water zone, nails must be stainless steel Type 304, Type 316, or hot-dipped zinc-coated galvanized conforming to a coating weight of ASTM A 153 Class D (1.0 oz/ft2).
• Stainless steel nails, although more expensive, offer the highest degree of corrosion resistance.
• Contact the nail manufacturer for further information to ensure the nails used comply with listed requirements and are correct for your application.
• Minimum nail lengths are shown in the fastener chart located in the CSSB Shingles Installation Guide.
• In double course applications, the exposed shingle should be face-nailed with two nails (as above), driven 2" above the butt line, and 3/4" from each edge.
• Western Cedar shingles wider than 10" require 2 additional nails driven approximately 1" apart near the center of the shingle.
**Please Note: Some nail manufacturers offer nails specifically for wood shake or shingle sidewall application. Contact the nail manufacturer for further information to ensure the fasteners used comply with listed requirements and are correct for your application.

• If you choose to use staples, they must be stainless steel Type 316 in locations within fifteen (15) miles of salt water.
• For locations outside of the salt water zone, stainless steel staples Type 304 or Type 316 must be used.
• Two staples should be driven per shingle with the staple crowns 7/16" minimum horizontal, maximum 3/4" horizontal, to the shingle butt.
• Staples are driven in the same location as nails relative to the sides and overlapping butt line.
• Shingles wider than 10" require 2 additional staples driven approximately 1" apart near the center of the shingle.
• Fasteners should be long enough to penetrate into the sheathing at least 3/4" or all the way through, and driven flush with the surface of the shingle.
• In all applications, staples should be concealed by the course above.
• Nails are preferred for aesthetic reasons in sidewall applications using exposed fasteners.