Very clever use of Douglas Fir. The rough-sawn boards of 200 x 25 Douglas Fir make an incredible effect of its prominent grain when concrete slabs are poured over it. This huge architectural home has these concrete panels for both interior and exterior featured throughout. Carefully laid on a slab with both for the face and the edge of the panels it produced an eye-catching wall when panels were raised from the slab. Contact our timber consultants today with your unique requirements.