Roof shingles consist of overlapping elements, typically flat rectangular shapes. They are laid from the bottom edge of the roof up, with each shingle joining one below. Shingles are made of various materials such as asphalt, wood, slate, plastic, and metal.
Slate, copper, and tile roofs are the sturdiest roofing materials and can last more than 50 years if cared for properly. However, more common in the Lower Mainland, asphalt roofs last about 20 years with wood singles lasting about 25 years.