BS EN 772-15:2000 PDF Download

BS EN 772-15:2000 is a standard that provides methods for testing masonry units made from autoclaved aerated concrete to determine their water vapor permeability. The standard specifies a particular method known as the saturated salt solution method for measuring the rate of weight loss of a sealed specimen.

In this method, a cup containing a saturated salt solution is used to create a controlled environment around the specimen. The salt solution creates a specific relative humidity level within the cup. The sealed specimen is then placed inside the cup and exposed to this controlled environment. Over a specific period of time, the weight loss of the specimen is measured.

By measuring the weight loss of the specimen, the water vapor permeability of the autoclaved aerated concrete masonry unit can be determined. The rate of weight loss provides an indication of how much moisture can pass through the material over time. This information is important for determining the suitability and performance of these masonry units in terms of moisture control and prevention of water penetration.