Cedar Shake Roofing for New Jersey Homes

Cedar shake roofing brings a warmth and natural beauty that no manufactured material can replicate. Across the affluent communities of Union County -- Summit, Westfield, Mountainside, and Berkeley Heights -- cedar shake roofs have long been the choice of homeowners who value authentic craftsmanship and distinctive curb appeal. The rich reddish-brown color of freshly installed Western Red Cedar, its gradual aging to a distinguished silver-gray patina, and the dimensional texture created by hand-split shakes give cedar roofing a character that evolves gracefully over decades.

New Jersey's climate presents both opportunities and challenges for cedar roofing. The state's moderate humidity supports cedar's natural moisture management properties -- cedar's cellular structure absorbs and releases moisture without the warping and cupping that affects other wood species. However, New Jersey's combination of humid summers, heavy rainfall, and limited winter sun exposure creates conditions favorable to moss, algae, and lichen growth on cedar surfaces. Understanding these dynamics and committing to proper maintenance is essential for any homeowner considering cedar shake roofing in Union County.

The cedar roofing market distinguishes between shakes and shingles -- terms that are often confused but describe significantly different products. Cedar shakes are split from logs, creating an irregular, textured surface with greater dimensional variation. Hand-split and resawn shakes have one textured face and one smooth face, producing the classic rugged appearance most associated with cedar roofing. Cedar shingles are sawn on both faces, creating a smooth, uniform surface with precise taper. Shingles produce a more refined, traditional look suited to colonial and craftsman architectural styles. Both products are available in Blue Label (premium grade) from the Cedar Shake and Shingle Bureau (CSSB), the industry grading authority.

Western Red Cedar (Thuja plicata) is the primary species used for roofing shakes and shingles in North America. The species is native to the Pacific Northwest, with the highest-quality roofing-grade cedar coming from old-growth and mature second-growth forests in British Columbia. The Cedar Shake and Shingle Bureau (CSSB) grades cedar roofing products into three categories: Blue Label (premium -- 100% edge grain, 100% heartwood), Red Label (intermediate -- mixed grain, minimum 80% heartwood), and Black Label (utility grade). For residential roofing in Union County, we specify Blue Label exclusively because the all-heartwood composition provides maximum resistance to NJ's moisture conditions.

The choice between hand-split shakes and sawn shingles impacts both appearance and performance on New Jersey homes. Hand-split and resawn (medium) shakes are the most popular product, typically specified at 24-inch length with 10-inch exposure. These shakes provide a bold, dimensional profile with 3/4-inch to 1-1/4-inch butt thickness. Taper-split shakes are thinner and produce a more subtle texture. Sawn cedar shingles, also typically 24-inch length with 7-1/2-inch exposure, create the refined, uniform appearance appropriate for colonial, Cape Cod, and craftsman homes common in Cranford, Fanwood, and Scotch Plains. For most Union County installations, we recommend hand-split and resawn shakes for their dramatic visual impact and the superior weather resistance their thicker profile provides.

Proper cedar roofing installation in New Jersey requires strict attention to ventilation, spacing, and underlayment. Unlike asphalt shingles, cedar shakes must be installed over a ventilated air space to allow moisture that migrates through the cedar to dissipate. The standard installation method uses interlayment -- a strip of 30-lb felt or synthetic breathable underlayment placed between each course of shakes. This interlayment serves as a secondary water barrier while maintaining the airflow that prevents cedar decay. Some NJ installations use a breather matrix system (such as Cedar Breather) between the shakes and the roof deck to provide continuous ventilation across the entire roof surface.

Fire treatment is not optional for cedar roofing in New Jersey. The NJ Uniform Construction Code requires roofing materials to meet minimum fire resistance standards, and untreated cedar does not achieve Class A or Class B ratings required in most Union County municipalities. Pressure-treated fire-retardant cedar uses chemical impregnation -- typically zinc chloride, ammonium sulfate, or proprietary formulations from companies like Cedarguard and Woodguard -- that penetrates the full cross-section of the shake or shingle. This is fundamentally different from surface-applied fire retardant coatings that may meet initial test standards but deteriorate with weathering. We exclusively install pressure-treated product from CSSB-listed treatment facilities.

Cedar roof maintenance in New Jersey is not optional -- it is a requirement for achieving the material's full lifespan potential. The humid climate of Union County promotes moss, algae, and lichen growth on cedar surfaces, particularly on north-facing roof slopes and areas shaded by trees. Annual debris removal (leaves, pine needles, branches) prevents moisture retention that accelerates cedar decay. Every 3-5 years, cedar roofs in NJ should be professionally cleaned using a gentle cleaning solution and low-pressure rinse -- never pressure washing, which damages the cedar fiber structure and removes the protective extractives that provide natural decay resistance.

Cedar preservative treatment extends the service life of cedar roofing in New Jersey by replacing the natural extractives that deplete over time through UV exposure and weathering. Oil-based cedar preservatives containing UV inhibitors, mildewcides, and water repellents are applied every 5-7 years by brush, spray, or dip. Products like Cabot's Bleaching Oil, Penofin, and TWP (Total Wood Preservative) are commonly used on Union County cedar roofs. The preservative treatment also controls the rate of color change -- untreated cedar weathers to silver-gray within 2-3 years in NJ, while preserved cedar retains warmer brown tones. Some homeowners prefer the natural silver-gray patina and choose UV-only protectants without color stabilizers, which is equally acceptable from a performance standpoint as long as fungicidal and water-repellent components are maintained.

Fire resistance is the primary regulatory concern for cedar roofing in New Jersey. The NJ Uniform Construction Code requires all roofing materials to meet a minimum fire resistance classification. Untreated cedar shake and shingle products carry a Class C fire rating at best -- insufficient for most Union County municipalities. Summit, Westfield, and several other Union County communities require Class A roofing materials on all new installations. Even in municipalities that accept Class B or Class C, we recommend Class A fire-treated cedar to maximize resale flexibility and insurance compliance.

Cedar roofing fire treatment must comply with UL 790 (Standard for Tests for Fire Resistance of Roof Covering Materials) to carry a listed fire classification. Pressure-treated fire-retardant cedar from CSSB-listed treatment facilities receives permanent Class A, B, or C fire ratings because the chemical impregnation is integral to the wood. Surface-applied fire retardant coatings may pass initial fire testing but are not recognized as permanent fire ratings in New Jersey because they deteriorate with weathering. Building inspectors in Union County verify fire treatment certification during the roofing permit inspection.

Additional NJ building code requirements for cedar roofing include proper ice and water shield installation at all eaves (extending at least 24 inches past the interior wall line), valley flashing with minimum 28-gauge galvanized steel or copper, and adequate attic ventilation (1 square foot of net free vent area per 150 square feet of attic floor, or per 300 square feet if a vapor barrier is installed). Cedar's breathable installation method with interlayment helps meet ventilation requirements, but ridge vents and soffit vents must still be properly sized and clear of obstruction.