Build your whole cladding project around our teak slatted boards here. Enter each wall’s width and height in metres and add any windows and doors — the calculator takes them off the area, then walks you through battens, fixings, starter clips and corner trims, and works out the edging each wall needs. Skip any step for parts you already have, and leave out any wall you’re not cladding. Teak slatted comes in 2.5m and 3.6m boards, so choose the length that gives the fewest cuts across your longest wall.