WEATHERGROOVE VERTICAL TIMBER CLADDING Weathergroove is the largest panel product available on the Australian market. This vertically grooved cladding is ideal for covering large areas in a short time. It is environmentally friendly, versatile and possibilities are endless, as it can be painted with any exterior grade acrylic or solvent based paint of your choice – not to mention, it’s easy to install. Weathergroove Smooth Architectural panel provides a smooth flat surface finish. When two panels are joined together, they are spaced 1200mm apart. The 5mm deep groove is 13mm wide, with a flat smooth base.