Bergen County Roofing: Article About Wind Resistant Roofing
When homeowners are replacing their existing roof or choosing the type of roof they wish to put on a newly constructed home, there are several factors that must be considered. Things like the type of roofing material and color are two of the most obvious. For the most part, they are chosen based on personal preference and what goes best with the house's architectural style. However, there is another less obvious factor that must be considered as well: the wind resistance of the roofing material to be used. Homeowners should consult with a Bergen County Roofing professional to gain a better understanding of the details and requirements before making their final choice.
Individuals should not assume that all roofs of similar appearance are the same. For example, at a glance, asphalt shingles may appear to differ only in color. However, they can vary in the level of winds they can withstand. Therefore, homeowners should find out the wind-zone classification for the area in which they live. The wind-zone classification for a given area is based on the maximum average wind speeds that the location experiences. For most of the continental United States, this rating is 90 mph. There are regions, however, in which the wind-zone classification can be up to 150 mph.
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Local building codes are likely to be based on these classifications.
Once the wind-zone classification is determined, material that meets or exceeds that rating should be chosen. In the case of asphalt shingles, the classification is indicated by a lettering system. Class D shingles can withstand winds up to 90 mph. Class G is rated for winds up to 120 mph, and Class H can withstand wind speeds up to 150 mph.
The third step in this process, following wind-zone determination and choosing materials accordingly, is the installation of the materials. Regardless of the rating of a shingle or other material, it must be installed properly for the rating to be valid. Installation of roofing materials goes deeper than the outer shingles, so it's important that a solid and secure decking is used.
Decking is typically made from plywood that is secured to the rafters by nails of adequate length at pre-determined spacing. Between the decking and the shingles is a layer of underlayment. Shingles are then installed with a specified number of fasteners per shingle. Not only is the number of nails important, but the way they are driven is also critical. They must be driven straight at the proper depth. If they are not deep enough, the shingles will not be properly secured. Driving them too deep, on the other hand, can cause damage to the material.