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Sarasota:
Brent Yoder
brent@cbsroofing.net
4575 Pike Ave
Sarasota, Fl. 34233
941-926-1900 office
941-926-1901 fax
Macon:
Greg Gober
greg@cbsroofing.net
2076 Graham rd.
Macon, Ga. 31211
(478) 788-9979
941-926-1901 fax
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ASPHALT 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.
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. 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. 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.
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 asphalt 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.
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