Composition (asphalt shingles)
Nowadays the most popular choice for material for roof shingles is the composition roof shingle, especially if you can't afford the high cost of clay tile or slate roofs. Higher-quality versions made from asphalt or fiberglass shingles offer a more durable option and may be available with recycled content. The advantage of these roof shingles is that they are quite pocket friendly. Apart from this, they are also available in a wide variety of styles and colors and thus you have a lot of options to choose from. They are relatively easy to install, and in some applications can be nailed in place over an existing roof. They require low maintenance and can be walked on without damaging the material. Most brands offer Class A fire protection. In other word, composition shingles have excellent fire resistant properties.
They come in two types - organic, and non-organic, which is fiberglass. They follow strict guidelines for manufacture. They come in a variety of colors and durability. They are seen on homes in every part of the country. The biggest downfall of this shingle is its vulnerability to wind and ice damage.
Organic shingles are generally paper (felt) saturated with asphalt to make it waterproof, then a top coating of adhesive asphalt is applied and ceramic granules are then embedded.It is generally 2 to 3 feet long. It is made of substances like tar, thick felt, crushed rock and other suitable materials all formed together into a single section. Organic shingles contain around 40% more asphalt per square (100 sq ft.) than fiberglass shingles which makes them weigh more and gives them excellent durability and blow-off resistance.
Fiberglass shingles have a base layer of glass fiber reinforcing mat. The glass fiber mat is not waterproof by itself. Fiberglass mat is made from wet, random-laid fiberglass bonded with urea-formaldehyde resin. The mat is then coated with asphalt which contains mineral fillers and makes the fiberglass shingle waterproof.Fiberglass reinforcement was devised as the replacement for asbestos paper reinforcement of roofing shingles and typically ranges from 1.8 to 2.3 pounds/square foot. A newer design of fiberglass asphalt shingle, called laminated or architectural, uses two distinct layers which are bonded together. Laminate shingles are heavier, more expensive, and arguably more durable than traditional shingle designs. Laminated shingles also give a more varied, contoured visual effect to a roof surface.
Below is a list of some of the advantages and disadvantages of Composition (asphalt shingles):
* Can be used on any house from contemporary to historic.
* ranges from low-cost 3-tab shingle to architectural shingles with extra durability and style
* many colors, types, and manufacturers
* suitable for most residential applications
* easy to repair
* fire resistant
* relatively short life-span (15–30 years)
* scars easily when hot
* subject to mildew and moss
* environmentally unfriendly