Q-Shades Shiplap Cladding is made from high quality certified softwood. Its finished size after machining is 14.5 x 120mm and each board covers 110mm. The Q-Shades wash is combined with Tanalith E Extra treatment giving the timber water repellant properties. They are ideal for finishing your own high quality buildings, sheds, cabins and screens. As a result of the preservative treatment process Q-Shades Pebble Grey products display subtle green tones that become more prominent upon exposure to ultra-violet light and diminish over a period of 12-24 months, slowly appearing more grey during this period before weathering gracefully thereafter. Please fix using 3.9mm x 40mm Stainless Steel Grey colour coded screws.