What is the minimum lap of rabbeted horizontal lap siding?

The minimum lap for rabbeted horizontal lap siding is established at 1/2 inch to ensure proper weatherproofing and structural integrity. This lap size creates an effective barrier against water infiltration, which is critical for maintaining the longevity and performance of the siding. Adequate lap also allows for adequate expansion and contraction of the materials, which can change dimensions with fluctuations in temperature and humidity. Using a lap smaller than this could compromise both the aesthetic appeal and functional performance of the siding, leading to potential issues such as leaks or increased maintenance needs.