2. Timber frames provide durable, strong, beautiful, and efficient structures. They use equal or less wood than stick built structures. These timbers can be recycled, and since there are no load bearing walls, interior walls can be moved or removed without structural damage to the building. 3. More durable roof coverings such as steel, copper, and fiber-cement delay replacement cycles. Solar cells are now integrated with asphalt shingles and can look similar to other types of roofing. Lighter colors absorb less heat.