As can be seen in the estimated duration table, the shavings as clothing are a very durable solution that can be passed on from generation to generation. selection of our pre-patinated coverings, which can all be finished with Wooden Houses TD products, the duration can be increased further and can simultaneously give both roofs and facades a completely unique patina and a characterful look with a minimum of maintenance. Immediate estimated duration for an untreated chipboard roof with a 45 degree slope : Acacia 90–100 years Oak 70–80 years Larch 40–50 years Pine 30–40 years Reduction of slope by approx. 10 degrees is equal to a reduction in duration by approx. 15%.