Most roofing synthetic underlayment materials are woven or spun from either polyethylene or polypropylene. While the ingredients are similar, the manufacturing process and thickness of each type of underlayment can be fine-tuned to produce different properties, such as exposure time and walkability. One way of comparing synthetic underlayment is by weight, similar to how felt is compared. Instead of pounds-per-100-sq.-ft., synthetics are rated by grams-per-sq.-meter (GSM).

Synthetic underlayments are generally made from engineered materials like polypropylene or polyester. Although traditional felt is sometimes referred to as “organic” when it contains some organic materials, it’s also saturated with asphalt. When it comes to roofing underlayment, “organic” doesn’t have the same green connotation that the organic foods aisle in the grocery store has, and some manufacturers market synthetic underlayment as a more sustainable choice.

The main application of this roofing membrane is the roofing heat insulation. It prevent the heat from geting into the house.

DERFLEX professionally produce and supplier the heat insulation fabric. If you have more interest, please contact our sales team for more information