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 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 that contains a dark brown pigment also Q-Shades Autumn Brown products will lose their initial deep brown lustre over 6-12 months before weathering gracefully thereafter.