Materials are the principal considerations for thermally efficient and durable Roof Systems. Materials can be selected as generic or supplier products, moved, amended and deleted.
Air cavities are essential for durability and can increase the stated thermal performance of the Roof System.
Adjust an air cavity by selecting the material, changing the 'Cavity Thickness' and 'Ventilation' strategies. You can also change the exposure, which is set 'To External' for exterior air cavities and 'To Internal' for interior air cavities.