Timber cladding is a material that is becoming more popularly used on the exterior of buildings. Cladding is defined as a material that can be affixed to the exterior of a building in order to provide a decorative and functional finish.  In this case, the cladding is made from timber.  Timber cladding generally comes in boards that are long and narrow and that are overlapped.  However, it can also come in shingle or panel forms.  It can be installed horizontally (the most popular way), vertically, or even diagonally, depending on the look that you are trying to achieve.