Advantage Thermally Modified Ash 1x6 Shiplap Siding combines the timeless appeal of wood siding with the enhanced durability of thermal modification. Engineered to resist rot, decay, and moisture, these shiplap boards create a clean, overlapping profile that adds depth and character to exterior walls and accent areas. Ideal for siding and cladding applications, Thermally Modified Ash delivers long lasting performance with a beautiful natural wood appearance.