What is the difference between Grace Triflex and 30lb roofing felt?
Grace Tri-Flex 30 synthetic roofing underlayment is a premium water-shedding underlayment. Unlike conventional roofing felts, it does not absorb water and can be used to “dry-in” roofs for up to 6 months before the primary roof coverings are applied. It is stronger than #30 felt and withstands high wind conditions; it is lighter than #30 felt and covers more area. However, as a water-shedding underlayment, the performance of the product relies on the ability of sloped roofs to shed water.
