Dimensional (Architectural) Shingles
 
Dimensional shingles, also known as architectural or laminated shingles, are becoming increasingly popular. These shingles are similar to regular three tab asphalt (or composition) shingles, but have two layers of shingle material bonded together rather than a single layer. The exposure of the top layer of shingles has random notches taken out, and the bottom layer is adhered to the top layer. This gives architectural shingles a scattered, three dimensional look to the roof, with different high and low tabs. But like regular three tab, they are still topped with a layer of granules for protection against weathering, and the base mats are between two layers of stabilized asphalt.
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Due to the thicker layer of material, they offer more protection from wind and hail than asphalt shingles. The heaviest grade architectural shingles can withstand winds up to 120 mph. These shingles are also very fire resistant. They have a longer lifespan, usually lasting for 40 years while manufacturer warranties can be seen anywhere from 20 to 50 years. The extra cost for these shingles is generally around 10 to 20 percent extra from that of regular asphalt shingles.
So you may have heard the rumors that architectural shingles were susceptible to mildew and algae damage just as composition shingles are. This was usually due to wet leaves or other debris building up on your roof. However, with improvements in roofing technology, architectural shingles have become algae resistant, eliminating the hassle of needing to keep your roof clean free from debris and ensuring the best performance and durability.
Pros: More attractive three dimesional appearance, durable, easily available, very wind resistant, algae and mold resistant, works on most roof types and pitches
Cons: Slightly more expensive than traditional asphalt shingles.
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Info from: Home Improvement Helper DOT COM
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G Cannon Inc. 