Roof shingle
From Wikipedia, the free encyclopedia
Roof shingles are a roof covering consisting of individual overlapping elements. These elements are normally flat rectangular shapes that are laid in rows without the side edges overlapping, a single layer is used to ensure a water-resistant result. Shingles are laid from the bottom edge of the roof up, with the bottom edge of each row overlapping the previous row by about one third its length. Historically, at the roof ridge there was a cap consisting of copper or lead sheeting which in modern times has been substituted by shingles with a plastic underlay.
Shingles have been made of various materials such as wood shingle, slate shingle, asbestos-cement, bitumen-soaked paper covered with aggregate (asphalt shingle) or ceramic. Due to increased fire hazard, wood shingles and paper-based asphalt shingles have become less common than fiberglass-based asphalt shingles. In the United States, fiberglass-based asphalt shingles are by far the most common roofing material used for residential roofing applications.
Nearly all the houses and buildings in colonial Chiloé were built with wood, and roof shingles were extensively employed in Chilota architecture. Roof shingles of Fitzroya came to be used as money and called "Real de Alerce".
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[edit] Aging of shingles
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| Left: Example of faster asphalt shingle wear along eaves due to channeled water running down the roof. Right: Severe shrinkage resulting in tearing away of entire flaps. Note the exposed nail heads. Water running down the roof can seep around the nails into the interior space. | |
The protective nature of paper and fiberglass asphalt shingles primarily comes from the long-chain petroleum hydrocarbons, while wood shingles are protected by natural oils in the cellulose structure. Over time in the hot sun, these oils soften and when rain falls the oils are gradually washed out of the shingles. During rain, more water is channeled along eves and complex rooflines, and these are subsequently more prone to erosion than other areas.
Eventually the loss of the oils causes asphalt shingle fibers to shrink and wood shingles to rot, exposing the nail heads under the shingles. Once the nail heads are exposed, water running down the roof can seep into the building around the nail shank, resulting in rotting of underlying roof building materials and causing moisture damage to ceilings and paint inside.
[edit] Tile
A shake is different from a tile:
- A tile is made of a ceramic material and is hard and brittle, poorly suited for places where tree limbs can fall on a house's roof, but not subject to deterioration due to rotting.
- A traditional shingle is made of wood. Roofing material made of more modern material (eg, asphalt composition, asbestos) is sometimes referred to as "shingles".
While tiles tend to last much longer than wood or asphalt shingles, they are brittle and prone to fracture. Walking on tiles can break them, requiring replacement or the roof will begin to leak.
