Schenectady Roofing: Article About Types Of Roof Underlayment
Whenever homeowners think of roofing, they rarely think of underlayment. However, underlayment is important to the roofing system. A Schenectady roofing professional may best explain underlayment and the need for it.
Roofing underlayment is the layer of protective material that is placed on the roof deck before the shingles are installed. Generally, it is installed under every type of roofing system, particularly asphalt. Manufacturers offer a wide variety of underlayment material options.
Historically, the most common type of underlayment has been roofing felt, which is also called tar paper. Roofing felt is made of felt that is reinforced with asphalt. Roofing felt has a perm rating of five. It has a classification of either fifteen or thirty pounds. Fifteen pound felt is not as water resistant as thirty pound felt. Thirty pound felt is thicker and more durable than fifteen pound felt.
A second type of underlayment is an improved version of the traditional asphalt reinforced roofing felt. This version is a fiberglass reinforced felt that is coated with asphalt. It is similar to the traditional thirty pound felt in that it has greater strength and durability. This type of felt lays smoother on the roof deck.
Another type of underlayment is synthetic underlayment. This type of underlayment is made from synthetic polymers, such as polypropylene, polyester, polyethylene and fiberglass fabric. It is lighter and tougher than traditional roofing felt and is considered skid proof.
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It is able to withstand exposure to inclement weather conditions for six months to a year.
Synthetic underlayment is thought to provide higher performance and greater protection than traditional underlayment. It is useful in regions that see plenty of inclement weather and extreme temperatures. In addition, synthetic underlayment offers greater resistance to tearing, moisture and leaks than traditional roofing felts. It has an extremely low perm rating, and it is not negatively affected by ultraviolet rays. Synthetic underlayment is more costly than traditional underlayment.
Another type of underlayment is self-adhesive undearlayment, also called rubberized asphalt. This type of material is made from felt that has been saturated with asphalt. Polyester, polyethylene or a polymer film is bonded onto one of the top layers. This makes this type of underlayment water and moisture resistant and skid proof. It has a sticky back, with a peel off film that can be press-applied to the roof deck. It seals well around nails and staples and is easy to install.
Several types of underlayment may be installed on the roof deck. Roofing professionals are well trained to understand the differences between them and choose the best type for the roof being installed. If a homeowner seeks greater insight into their options for underlayment applications, consulting a roofing professional may help.