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The Woodlands Roofing: Article About Underlayment

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Although the exterior of a roof may look like it is only made up of shingles or tiles, it in fact is a complex system consisting of several layers of materials that extend from the peaks to the eaves. From the vents to the underlayment, trusses and joists, each component of the system has important functions in order to protect the home from moisture and other forms of damage. With some guidance from The Woodlands roofing contractors, homeowners can make sound decisions about the best type of underlay for their residences.

Unless a home is located in the desert, the roofers should put down an ice and water shield on top of the plywood or wooden boards. This shield is a waterproof membrane that helps prevent the intrusion of water into the trusses holding up the roof and the ceilings of the rooms below it. On high risk areas of the roof such as the eaves, two layers of waterproof membrane provide an additional measure of protection against roof leaks and other problems like ice dams.

Another type of underlay that can be used is rubberized asphalt.

A roofing contractor from Brinkmann Quality Roofing Services of Woodlands can answer your questions about residential roofing or roof repairs.

Rather than a film, this material is applied like a coating around openings of the roof, such as where a chimney or flue comes through. This helps to seal the area against drips coming off the mortar or streams of water that leak off the chimney cap or vent box cover. This material should be applied to the sloped surface of the roof as well as up and around the chimney or vent flashing.

Metal strips of flashing are the final component of a home's underlay. Installed onto the valleys of a roof as well as around the perimeters of rooftop protrusions such as box vents, skylights and flues, these galvanized steel or aluminum strips help to create a barrier between the roof's exterior surface and the wooden parts underneath. Flashing can also be applied around dormer windows and other specialty roofing features.

An annual roof inspection can help to ensure that the flashing is not oxidizing or getting loose. Inspections also help to check for signs of moisture intrusion in the underlayment. When properly installed on a roof that receives regular maintenance, the flashing and underlayment should last for at least as long as the rest of the exterior materials. On an asphalt shingle roof, the underlayment should therefore last an average of 20 years, while on a clay tile roof, it should be good for 30 years or longer.

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