THERMOPLASTIC ROOFING MEMBRANES FOR FULLY-ADHERED ROOFING SYSTEMS
A roof system comprising a substrate and thermoplastic membrane adhered to the substrate, where the thermoplastic membrane is characterized, prior to being adhered to the substrate, by a stiffness represented by a flexural modulus of less than 90 MPa, or by a Taber stiffness of less than 15, or by a Shore D hardness of less than 40, or by a combination of a flexural modulus of less than 90 MPa, a Taber stiffness of less than 15, and a Shore D hardness of less than 40.
1 . A roof system comprising:
a substrate and thermoplastic membrane adhered to the substrate, where the thermoplastic membrane is characterized, prior to being adhered to the substrate, by a stiffness represented by a flexural modulus of less than 90 MPa, or by a Taber stiffness of less than 15, or by a Shore D hardness of less than 40, or by a combination of a flexural modulus of less than 90 MPa, a Taber stiffness of less than 15, and a Shore D hardness of less than 40.
2 . The roof system of claim 1 , where the substrate is selected from the group consisting of a roof deck, an insulation board, a cover board, and an existing membrane.
3 . The roof system of claim 1 , where the thermoplastic membrane includes first and second opposed planar surface with one of the opposed planar surfaces being adhered to the substrate.
4 . The roof system of claim 1 , where at least 50% of the at least one planar surface of the membrane is adhered to the substrate.
5 . The roof system of claim 1 , where the membrane is adhered to the substrate through a polyurethane adhesive.
6 . The roof system of claim 1 , where the membrane is adhered to the substrate through a pressure-sensitive adhesive.
7 . The roof system of claim 1 , where the membrane includes one or more layers, and where at least one layer includes a propylene-based elastomer.
8 . The roof system of claim 1 , where the membrane is characterized by a flexural modulus of less than 90 MPa.
9 . The roof system of claim 1 , where the membrane is characterized by a Taber stiffness of less than 15.
10 . The roof system of claim 1 , where the membrane is characterized by a Shore D hardness of less than 40.
11 . The roof system of claim 1 , where the membrane is characterized by a flexural modulus of less than 70 MPa.
12 . The roof system of claim 1 , where the membrane is characterized by a Taber stiffness of less than 8.
13 . The roof system of claim 1 , where the membrane is characterized by a Shore D hardness of less than 20.