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Asphalt Roofing Shingles

 

Asphalt Roof Shingles are widely used in roofing system,which is made of bitumen based on the fiberglass substrate or polyester substrate.

Features:
1.Asphalt roof shingles can resist erosion caused by light ,hot and cold,winter weather and other factors;
2.The low thermal conductivity of asphalt roof shingle can prevent heat transfer from indoor to outdoor;
3.Asphalt roof shingles can be rusted under atrocious weather;
Flame retardance;
4.Economic and convenient construction ;
5.Long service time and low maintainability;

Some articles about asphalt roof shingles:

Two types of asphalt shingles are used: organic and fiberglass or glass fiber. 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. In the case of algae-resistant shingles, a portion of the granules contain leachable copper ceramicly coated, designed to protect against discoloration from algae on the roof. This will not protect against moss growth but it will retard the process. Moss likes to feed on algae and any other debris on the roof. Most manufactures will offer a 5 to 10 year warranty against algae growth, 3M (scotchgard TM) offers a 20yr warranty.

Shingles are judged by weight per square. 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, this extra needed asphalt makes this shingle less environmentally friendly (despite its "organic" nickname. The paper based nature of "organic" shingles leaves them more prone to fire damage, and their highest FM rating for fire is class "B". Shingle durability is ranked by waranteed life, ranging from 20 years to 50 years; in some cases lifetime warranties are available.
Fiberglass shingles have a base layer of glass fiber reinforcing mat. 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 shingles typically obtain a class "A" fire rating as the fiberglass mat resists fire better than organic/paper mats. 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.

The older asbestos versions were very durable and hard to tear, an important property when considering wind uplift of shingles in heavy storms. Fiberglass is slowly replacing felt reinforcement in Canada and has replaced mostly all in the United States. Widespread hurricane damage in Florida during the 1990s prompted the industry to adhere to a 1700 gram tear value on finished asphalt shingles.

A newer design of fiberglass asphalt shingle, called laminated or architectural, uses two distinct layers which are bonded together with ashalt sealant. Laminate shingles are heavier, more expensive, and arguably more durable than traditional 3-tab shingle designs. Laminated shingles also give a more varied, contoured visual effect to a roof surface.
Per 2003 International Building Code Sections 1507.2.1 and 1507.2.2, asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater. Asphalt shingles shall be fastened to solidly sheathed decks.

 

 

From :http://en.wikipedia.org/wiki/Asphalt_shingle

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