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Rockland County Roofing: Article About Roofing Nails

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Moisture cycling is a normal part of the weather. In places like New York, houses are exposed to rapid and frequent changes in humidity, rain, ice and snow. A home's roof bears the brunt of these moisture cycles because it has the largest sloped horizontal surface that comes into contact with the precipitation. Experienced Rockland County roofing contractors work to use durable materials that resist damage from moisture and can conduct inspections to determine whether a roofing system has excessive wear and tear due to water infiltration.

Wood experiences considerable effects due to moisture cycles. Wooden sheathing absorbs moisture and expands as the wood's cell walls fill up with water. When conditions dry out, the wood shrinks back down to its original size. As this cycle repeats itself countless times, wood can begin to split and crack. The weakening of the wooden decking of a roof can cause fasteners to pull out of place. As the wood becomes weaker, it may be less able to support the weight of the exterior roof covering. Interior support beams may start to buckle, rot or split. This can even happen with pressure-treated wood.

Another effect of moisture cycles is expansion and contraction of metal. Most roofs have at least some metal parts, especially in the flashing at the valleys and around rooftop protrusions like flues, chimneys and vents.

Precision Roofing, Rockland County roofing experts can answer questions regarding TPO roofing or asphalt roofing.

Skylight frames, gutters and downspouts are also typically made from metals. In high-humidity conditions and warm temperatures, metal expands. When the temperature and humidity levels drop, the metal contracts. If the metals were installed during a time of higher humidity, their contraction could cause fasteners to pop or unthread. If the flashing strips or metal fasteners were attached to the roof during low humidity, their expansion may cause large holes to develop, which can eventually split or crack shingles and tiles.

Separation of shingles and metal panels is another unfortunate result of moisture cycles. A metal screw used to attach copper, aluminum or galvanized steel panels may work its way up through the wood and the panels. The increased exposure to rain, ice and snow can cause the fastener to corrode and break off. As the fastener becomes looser, a strong wind gust could blow the panel off the rooftop. A similar effect can happen with shingles. An uplifted roofing nail decreases the adherence of layers of shingles at the point where they overlap each other. This decreases the roof's water resistance and can lead to a leak.

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