The planks are quarter sawn and dried. The parts are 45 cm long and have a varying width ranging from about 8 to 20 cm. The thickness tapers from about 1 to 8 mm. The contents of one package of shingles is good for 2.3 m2.
The shingles are laid in three layers, overlapping like roof tiles, with the thickest end oriented down. Eventually only 15 cm of the bottom shingle is revealed. The bottom row consists of two shingles that have been placed on top of each other with offset seams.
The shingles are preferably installed on a frame of slats with a 15-cm centre-to-centre distance, so there is ventilation from underneath.
Every shingle must be fixed with two stainless steel nails or staples. In the photo, the shingle has been slid slightly upwards to clearly show that the nails are covered by the shingle that is placed on top of it.
Do not place the shingles tightly next to each other; they need some room to expand. Leaving about 5mm in between is ideal.