When to Replace a Cedar Roof?

Age

• Wood shingles have an effective life of about 20 years while the heavier wood shake may last up to 25 years, according to Texas A&M University. This is under ideal circumstances and with proper care. The more moisture and sunlight the roof receives the shorter its life expectancy.

Signs of Deterioration

• Cedar shakes and shingles lose their red or orange color and turn to a gray as they deteriorate. Other signs of aging include cupping or splitting of the shingles. When the roof is observed closely small surface cracks may also be evident. Inspect a cedar roof from a ladder or scaffolding rather than by walking on the roof surface, which can damage the roof material. A limited number of damaged shingles in an area close to the edge of a roof may be replaced individually but if the damage extends to multiple areas or is widespread, replacing the entire roof may be necessary.

Leaks

• Leaks are one of the most obvious signs of a roof problem. Check the rafters and roof decking from the inside of the building for signs of water stains. In worst-case scenarios, you may even be able to see pinholes of daylight through the roof from the inside. Multiple leaks commonly indicate a roof in need of replacement. A single leak may be repaired with a new shingle or roofing tar. Observing daylight through the roof or ceiling inside would also indicate serious problems with the roof and most likely total replacement would be warranted.

Preventing Damage

• Pressure washing cedar roofs, using pressures of less than 1,500 psi, removes algae and other surface materials that hold moisture into the shingle and promote decay. After cleaning, applying a preservative treatment will help extend the life of the cedar roofing. Clean and apply preservatives to the shingles or shakes before the roofing material shows signs of decay. These preventative steps will extend the life of the shingles but will not rejuvenate damaged shingles.