scope:

 This laboratory test method² provides a procedure for determining the resistance to water penetration and leakage through unit masonry subjected to wind-driven rain. This test method is not identical to and the results are not the same as field standard Test Method C1601. This test method measures through-wall water penetration, whereas Test Method C1601 only measures surface water penetration.

The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see Section 6.

² This test method is based upon those used by the National Bureau of Standards and described in NBS Report BMS7, "Water Permeability of Masonry Walls," 1933, and NBS Report BMS82, "Water Permeability of Walls Built of Masonry Units," 1942.

*A Summary of Changes section appears at the end of this standard