The most common type of roof shingles are made from asphalt or fibreglass. Here are some interesting places to gather more information:
These are the types of valley materials.
90lb Roll Roofing is not recommended for valleys on your roof as the life expectancy is only 6 to 10 years. Therefore you’ll run into maintenance issues before warranty expiration.
Metal valleys are 24″ wide and pre-painted. Although an advantage of metal valleys is their durability, the disadvantages are that there are joints every 8′ and they are only 24″ wide. Therefore, it has less coverage under each side of the valley. Also, with drastic changes in temperature, metal expands and contracts often. The chance of having a nail pop up through the shingle is very common and could create leaks.
SBS. We recommend SBS which is a granulated bituminous roofing material. There are no disadvantages to using SBS. It will outlast any asphalt shingle or tile on the market today. An SBS valley can be up to 30′ long with no seams. It is also 40″ wide and therefore has more coverage on each side of valley. Due to its high flexibility and tensile strength, it is ideal for extreme climate changes. People are replacing their roofs today because of inferior valleys. Rest assure that when your roof needs replacing it will not be because of your SBS valleys.
For information on SBS modified bitumen membrane
CertainTeed DiamondDeck synthetic underlayment, No. 25 GBS and No. 30 felt
These are the different types of underlayment that are commonly used for the first three feet of your roof area.
Boston Roofing’s Recommendations:
We recommend for all roofs, with a pitch up to 7 and 12, that CertainTeed DiamondDeck synthetic underlayment be applied over the entire roof area. This is recommended to keep your roof deck drier, and as well, reduce energy costs. The benefits of applying felt all over your roof deck are that you are not relying on shingles alone to keep the water out, due to ice damming and driven rain. Boston Roofing says “People are not aware that shingles are not waterproof, they are designed to shed water.” If you submerge a roof under water it will leak. That is why it is very important that on all low angled roofs the entire roof area should be covered with CertainTeed DiamondDeck synthetic underlayment at minimum. We receive a lot of feedback from our clients that having felt over the entire roof area their home is cooler in the summer and warmer in the winter.
People are not aware that the reason why their attics are so hot in the summer is because shingles absorb and transfer heat into the attic. Therefore, by applying felt to the roof area it will reduce the transfer of heat into your attic. If your attic is cooler, your house will be cooler.
We also recommend that three feet of ice and water shield be installed around the perimeter of your home. Due to the drastic changes in our climate, there is a lot more ice build up today on our roofs than ever before. Boston Roofing says “Protect your roof deck as much as possible.” Every winter, for the past ten years, we have been receiving hundreds of calls per year to remove ice and snow on roofs that are contributing to leaks into their homes. To avoid expensive service calls, due to ice breaking and snow removal, Boston Roofing says, “Do it right the first time.”
