ASTM D6904-03 (R2022) PDF Download

ASTM D6904-03 (R2022) standard specifies the method for assessing the ability of coatings to prevent the penetration of water through masonry block surfaces. The practice involves subjecting the coated masonry to water spray and air pressure to simulate wind-driven rain conditions. The purpose of this standard is to evaluate the effectiveness of coatings in preventing water intrusion into masonry structures, which can help maintain their durability and protect against moisture-related damage.

The standard establishes the testing parameters and procedures for conducting the evaluation. It provides guidelines on spray intensity, spray duration, and air pressure levels to simulate various wind-driven rain conditions. The evaluation is conducted by observing and measuring the amount of water that passes through the coating and reaches the masonry substrate. The standard also includes requirements for conditioning the coated samples prior to testing to ensure consistency in the evaluation process.