This standard describes procedures for paints external exposure testing on wood substrates, designed to assess the performance of Houses and Decorative Coatings. The test covers new wood and its unpainted condition, assessing the durability of Coatings by exposing the wood to different environmental conditions. As changes in environmental factors such as solar radiation and Humidity can affect coating performance, testing in different climates is recommended to obtain more comprehensive data. The standard also covers sample prepatives and test conditions, and highlights the importance of using SI units and ensuring safe practices.