The first layer of waterproofing material that goes on your roof is called as roof underlayment; it is laid under the roofing materials and serves as the last line of defense against severe weather. Generally known as “felt paper”, roof underlayment is composed of a paper roll or fiberglass that is concealed by asphalt and other materials for waterproofing.
The three main types of roof underlayment are rubberized asphalt, asphalt – saturated felt, and not bitumen synthetic. Black, asphalt – saturated felt the paper is the most common type of underlayment used for homes with steep – slope applications.
This kind of felt paper is produced from organic or fiberglass substrate but the name organic is much commonly used. The fact that is has a cellulose base gives it the name “organic”. To let you decide on what type of roof underlayment is suitable for your house, here are the types of roof underlayment.
This type of underlayment is not waterproof but is resistant to water; it is commonly available in 15 and 30-pound thickness. The amount of water that can pass through the 15-pound thickness is around five but the number can rise if the condition has higher humidity while the 30-pound thickness is able to repel damage better during the installation and protects the roof longer.
On numerous occasions, felt underlayment has been used as a lightweight protection against any potential storm damage. The roof will not be able to defend itself against the elements if a tile or shingle blows off during a storm or breaks.
Even though it’s not a long term solution, it protects long enough to give the homeowner enough time to get the roof repaired. Fortunately, there are many roofing companies that provide professional high quality and professional services such as roofing Chula Vista
Asphalt – Saturated Felt
After processing of crude oil, asphalt is the left over material. Due to the fact that the price of oil is increasing, companies develop refining methods that will extract the maximum amount of high quality from the crude.
The method produces less asphalt and because of that an allocation system is made to that gives a limited amount of asphalt to manufacturers per year, because of this, most manufacturers started phasing out asphalt – saturated underlayment.
Different types of rubber like materials are produced by manufacturers for underlayment in which they call as “rubberized asphalt”, protected by a peel – off and has adhesive on one side. Rubberized asphalt is produced to meet different requirements. The underlayment may have polyethylene or polyester to make it weather resistant.
Some features are changed so that it can be used in higher temperatures. Some underlayment is configured to repel heat up to 250 degrees, allowing this type of underlayment to be implanted under metal roofs in severe weather.
This type of underlayment is made from either polypropylene or polyethylene, the advantage of using synthetics is that it is lightweight but high in strength, resistant to fungal growth and is wrinkle free because it doesn’t absorb moisture.
Synthetics can also be designed as moisture – permeable but are typically considered as moisture barriers. It is also resistant to UV damage and allows exposure to weather from six months to a year without damage.