TAMKO TW UNDERLAYMENT self-adhering underlayment is a 40-mil, thick, flexible, self-adhering, rubberized asphalt sheet membrane with a polymer film on the surface and a removable treated release film on the adhesive side.

TW UNDERLAYMENT is well suited for use as an underlayment where prevention of water penetration is required including metal roofs. TW Underlayment also provides secondary protection against water penetration after installation of a metal roof system. When fasteners penetrate the TW Underlayment membrane during installation, the metal roof system manufacturer's  recommendations should be followed to assure watertight integrity at the fastener penetrations.

• Rubberized asphalt 
• Textured polymer surface provides enhanced skid resistance
• Self-adhesive and treated release film for easier installation
• High temperature resistance up to 245° F 
• Can be left exposed for up to 90 days before application of finished roof 
• Roll size is 200 square feet. (39-3/8" x 61')