Polyester Roofing Felt Underlay

Asphalt saturated felt was the go to roofing underlayment until about 15 years ago.

Polyester roofing felt underlay.

It is combines with other water resistant compounds that produce a membrane. Upper and lower surfaces are sand finished. Upper surface finished with a green mineral with 75mm selvedge or sand finished for use in a protected flat roof system. Commonly referred to as felt paper or tar paper common roofing felt is made of varying blends of cellulose natural plant fibers polyester bitumen or asphalt.

The substance itself is made from bitumen which comes from the distillation of crude oil that has been either mixed with sand or crushed limestone. The anderson ht polyester system was the first bitumen flat roofing membrane system to utilise the high strength performance of polyester carriers following the move to lighter more flexible modern building structures. Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe. This type of roofing material was the go to for many years up until about 15 years ago.

Since it has become one of the leading underlayment products on the market. It comes in two thicknesses. That s when synthetic products started gaining in popularity. Roofing asphalt saturated felt is a blend of cellulose polyester bitumen and asphalt soaked in a waterproofing agent.

Synthetic underlayment is composed of a polymer combined with polyethylene or a polypropylene. High performance oxidised bitumen flat roofing membrane with polyester reinforcement. These compounds include varying blends of cellulose polyester and bitumen. Thirty pound felt is more thick and stiff than fifteen pound so thirty pound is more resistant to damage during installation.

Traditional roofing felt is a felt paper that is soaked in asphalt. These systems are sometimes used to construct roofs in the form of roofing felt or roll roofing products. Anderson ht polyester capsheets. Apoc carries the widest variety of astm rated and non rated organic felts.

The anderson ht flat roofing system consists of the following products. Roof underlayments are water resistant or waterproof base layers that are used beneath the primary roofing material. After a long time of felt underlayment being the primary choice for roof underlayment in the u s synthetic underlayment entered the market in the late 20th century. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing.