WOOD SHINGLES AND SHAKES
Wood roofing, in one form or another, has been in use in Canada for hundreds of years. Wooden shingles have been made from a wide variety of materials, such as; cedar, pine, spruce and oak.
The most common form of wood roofing, today, is the Western red, cedar shingle or shake. it is a lightweight, yet sturdy material and has a natural resistance to deterioration and insect infestation.
Cedar shingles and shakes can be applied to a roof either on spaced or solid sheathing. it is generally accepted that when spaced sheathing is used, the life of the shingles will be increased due to the improved air circulation which allows the wood to dry from both sides. this decreased the likelihood of rot and deterioration. however, solid sheathing is recommended in areas of high snow and wind activity. Blowing snow may penetrate the spaces between the shingles and the sheathing and cause water damage in the attic and/or interior finishes.
The following items have been identified on the subject roof coverings:
- There are a number of loose/damaged shingles/shakes which need to be repaired or replaced.
- There are a number of shingles with a flat grain which will result in premature cracking and splitting.
- There are a number of shingles that have been cut with too much cross grain which may cause splitting and breaking.
- Untreated pine shingles/shakes are present. These could have a limited life span of approximately five (5) years. Further evaluation is required.
- The spacing between adjacent shingles/shakes is excessive. This may allow water to penetrate the building.
- Some/all of the shingles/shakes have not been fastened with corrosion-resistant fasteners. Oxidization of the fasteners will shorten the life of the roof coverings. The shingles/shakes may become loose and susceptible to wind and weather damage.
- There are a lot of pine/spruce needles accumulated in the spaces between the shingles/shakes. These need to be cleaned out to provide a clear passage of water and snow off the roof.
- There is a build-up of moss in some areas of the roof. This may indicate a moisture and rot problem. These areas need to be investigated by a reputable roofer who is experienced in wooden roof installations.
- The flashings in the valleys are insufficient. It is recommended that a centre-crimped, pre-painted, metal flashings be installed over a layer of roofing paper.