TYPES OF ASPHALT SHINGLES
Organic-based shingles are the oldest type of asphalt roofing tile. The organic part of asphalt shingles is a cellular fibre substrate, often recycled paper, impregnated with asphalt and compressed under high pressure. More flexible than fibreglass shingles, they are easier to install in cold weather, more tear-resistant and able to hide imperfections on the roof’s deck. Organic shingles are heavier and therefore more resistant to strong winds. And more important in our northern climate, they are better at withstanding changes in temperature.
Currently more popular: asphalt shingles manufactured with a mat composed entirely of glass fibres, referred to as composition shingles. The fibreglass mat is surfaced with an asphalt coating, followed by mineral granules. Laminated or architectural shingles are somewhat thicker due to an extra layer of tabs. Fibreglass shingles are lighter than their organic counterparts, because less asphalt is used during manufacturing, and they are less expensive. They are also more heat-resistant and the “feet”, or notched ends, are less likely to lift, a problem often encountered on older roofs. An underlayment of asphalt-saturated felt should be installed over the roof structure prior to laying fibreglass shingles.
Starter shingles- Typically installed along the edge and up the valleys of a roof.
Three tab shingles- Typically known as builder shingles and used as ridge cap shingles.
Laminated shingles- Commonly used in residential homes.
It is very important to fully prep a roof with underlayment before installing shingles, especially on roofs with lower slope. On the areas where typically the snow sits and melts which could create leaks, ice and water shield ( or other peeling stick materials) is a must to prevent leaks in your home. Even with new shingles if there is no extra layer of protection underneath it will result in leaks. Typical areas where ice and water shield should be applied are skylights, valleys, along the walls, chimneys and eaves. On the rest of the exposed wood we can go with either a felt underlayment or synthetic. Drip edge along the eaves is also a must, if shingles are left overhanging over 2 inches they will eventually curl and crack.
It is important to insure that you have proper ventilation on your roof attic. Most of the time home owner and contractors don't bother going inside the attics to check for:
-Proper ventilation ( Soffits and roof vents)
If there is not proper ventilation you could be looking at mould on your truss and plywood. Not only is it important to add the proper amount of roof vents you must also check on soffit venting. You could add as many roof vents as you want if there is no intake from the soffit there won't be any air circulating.
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