Tongue and groove 25x125mm, sold per metre. Metsä Wood softwood exterior wall cladding is kiln dried for increased durability and precision finished. This allows you to have flexibility on the finish and style you want to achieve as it can be stained, varnished, painted and treated. Thinner profiles of softwood exterior cladding are commonly used to make sheds, summer houses and animal houses. Thicker profiles are more commonly used for façades.