At the risk of tedium, R703.1.1 exception 2 states:
"Compliance with the requirements for a means of drainage, and the requirements of Section R703.2 and Section R703.8, shall not be required for an exterior wall envelope that has been demonstrated to resist wind-driven rain through testing of the exterior wall envelope, including joints, penetrations and intersections with dissimilar materials, in accordance with ASTM E 331 under the following conditions:" (et al)
Per ASTM's subtitle for E 331, it is a " Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference."
Finally the question; does the use of this exception require the field use of all of the specific E 331 tested components (i.e., cladding , specific flashing details for joints, penetrations and intersections with dissimilar materials, WRBs, etc. )? In other words, is it the intent of the code that a designer may select a single component out of the test mock-up (i.e., the WRB) and invoke this exception?
I don't believe that is the intent but I would appreciate hearing your take. Thanks !!!
"Compliance with the requirements for a means of drainage, and the requirements of Section R703.2 and Section R703.8, shall not be required for an exterior wall envelope that has been demonstrated to resist wind-driven rain through testing of the exterior wall envelope, including joints, penetrations and intersections with dissimilar materials, in accordance with ASTM E 331 under the following conditions:" (et al)
Per ASTM's subtitle for E 331, it is a " Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference."
Finally the question; does the use of this exception require the field use of all of the specific E 331 tested components (i.e., cladding , specific flashing details for joints, penetrations and intersections with dissimilar materials, WRBs, etc. )? In other words, is it the intent of the code that a designer may select a single component out of the test mock-up (i.e., the WRB) and invoke this exception?
I don't believe that is the intent but I would appreciate hearing your take. Thanks !!!
