The installation of cedar shake shingles improves curb appeal while providing natural insulation and durability. This guide covers planning, materials, and step‑by‑step techniques to help homeowners and contractors achieve a long‑lasting cedar shake roof. Proper installation focuses on careful deck inspection, correct underlayment, accurate shingle nailing, and effective flashing around hips, valleys, and penetrations. Following best practices ensures performance, fire safety alignment, and aesthetic appeal for American homes.
Planning And Materials
Begin with a clear plan that matches the roof’s geometry and climate. Cedar shakes come in various thicknesses and grades; select a product suitable for the roof slope, wind rating, and local building codes. Typical package coverage ranges from 20 to 25 square feet per bundle, depending on shake size. Common materials include cedar shakes, underlayment, starter strips, galvanized or stainless steel nails, corrosion‑resistant flashing, and drip edge strips. For fire‑resistant regions, verify compliance with local codes and consider approved fire‑rated underlayment and ignition barriers.
Tools And Personal Protective Equipment
Essential tools help ensure consistent alignment and fastener depth. Use a circular saw with a masonite or carbide blade for trimming shakes, a sharp hand plane for rough edges, a roofing hatchet, a hammering gauge, a chalk line, and a pry bar for lift inspection. For safety, wear slip‑resistant boots, a climbing harness when working on steep pitch roofs, eye protection, gloves, and a hard hat. A roofing magnet helps pick up nails from the deck as work progresses.
Roof Deck Preparation
Inspect the roof deck for rot, warped boards, and loose fasteners. Remove damaged sheathing and replace with matching thickness to maintain a uniform surface. Clean the deck of debris and ensure it’s dry before applying underlayment. If the roof is vented, confirm intake and exhaust clearance to avoid moisture buildup. Trim any protruding nails or splinters that could puncture the underlayment or shingles. Proper deck preparation minimizes nail shearing and extends shake life.
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Underlayment And Starter Strips
Install a high‑quality underlayment that resists tearing and provides a secondary water barrier. In many climates, a synthetic underlayment is preferred for its durability and lighter weight. Begin with a solid starter course at the eaves to ensure proper alignment of upper courses. Overlap seams according to manufacturer guidance, typically 19 to 24 inches for synthetic underlayment, and secure with corrosion‑resistant fasteners. The starter strip creates a straight line and helps control the first course of shakes for a clean, uniform look.
Installing Cedar Shakes
Shakes should be installed with proper exposure to balance aesthetics and performance. Begin at the eave, placing the first row with the bottom edge flush to the drip edge. Maintain a consistent exposure, commonly 5 to 6 inches for standard shakes, and adjust for local wind requirements. Use a roofing gauge to maintain even nailing pattern and ridge alignment. Cut shakes with a sharp saw for clean edges and remove thin, knotty portions that may weather unevenly. In each course, stagger end joints to minimize seam visibility and reduce wind uplift.
Nailing Pattern And Fastening
Use corrosion‑resistant nails long enough to penetrate the decking by 3/4 inch or per manufacturer instructions. Drive nails straight, not at an angle, to avoid splitting shakes. Some manufacturers require two nails per shake near the top third for wind resistance; others may specify three nails for steeper pitches. Avoid overdriving nails, which can cause shakes to crack. Ensure nails are spaced evenly along the nailing strip and do not nail through the exposed surface area of the shake itself.
Flashing, Valleys, And Roof Penetrations
Install flashing at all valleys, hips, chimney connections, skylights, and vent penetrations to control water intrusion. Use corrosion‑resistant metal flashing and seal joints with compatible sealant. Cedar can shrink or expand with moisture changes, so apply flashing with adequate overlap and use sealant in a manner that allows for movement without tearing. For valleys, consider a solid metal valley liner or a tightly lapped shingle approach to maintain a clean, durable water barrier.
Ventilation And Roof Spacing
Proper roof ventilation reduces moisture buildup and extends shingle life. Ensure soffit vents, ridge vents, or attic fans provide adequate airflow beneath the shakes. Do not over‑tighten underlayment or install over packed insulation that restricts airflow. Maintain a small air gap between the underlayment and any solid eave materials to promote drying. Adequate ventilation improves energy efficiency and reduces cupping and warping of cedar shingles over time.
Maintenance And Longevity
Regular inspection helps identify early wear. Look for cupping, splitting, and fungal growth and clean debris that can trap moisture. Treat shakes with a cedar‑friendly preservative or oil finish every few years to guard against weathering, while avoiding overly glossy coatings that trap moisture. Reseal flashing joints and replace any damaged shakes promptly to prevent leaks. A well‑maintained cedar shake roof can last several decades with proper care and climate‑appropriate maintenance.
Common Mistakes And Expert Tips
Avoid common errors such as overexposure, improper nailing, or starting with uneven starter strips. Improper shingle spacing can cause water foil and wind uplift. Always follow the manufacturer’s installation instructions for nailing and exposure. Consider hiring a professional roofer for complex roof shapes, high wind regions, or when local codes require qualified installation. A careful, methodical approach yields consistent results and a durable cedar shake roof.