The applicable laboratory test method for determining the water penetration resistance of curtain walls and storefront assemblies is ASTM E331, “Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference”. The applicable laboratory test method for window wall assemblies is either ASTM E331 or ASTM E547, “Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Cyclic Static Air Pressure Difference”.
If field testing for water penetration is to be conducted, the applicable test method is ASTM E 1105, “Standard Test Method for Field Determination of Water Penetration of Installed Exterior Windows, Skylights, Doors, and Curtain Walls, by Uniform or Cyclic Static Air Pressure Difference”.