GLAC 2 MED STP CABIN 1 MATERIALS

The opportunity is for the provision and installation of weather-resistive barriers on the exterior side of exterior wall sheathing for the GLAC 2 MED STP CABIN 1 project. The contractor should furnish and install the materials according to the contract documents and manufacturer's instructions. The weather-resistive barrier should be a spunbonded polypropylene weather membrane with a microporous coating, nonwoven, and nonperforated, with specific performance characteristics. The approved manufacturer is TYPAR Weather-Protection Membrane by Berry Global, Inc. Some key points to consider: • The weather-resistive barrier should have a Gurley Hill [TAPPI T 460] of >2500 sec/100cc. • The water vapor transmission should be 9-15 perms as tested by ASTM E96-90, Method A. • The water penetration resistance should be >500 cm on hydrostatic head in accordance with AATCC-127. • The trapezoidal test should be 30/33 in accordance with ASTM D5733-9. • The air-ins should be <0.02 L/S·M2 @ 75 PA. • The dry indicator method should be equal to a 24-hour rating.