Gyproc GUB Bris is a 9,5 mm thick sheathing plasterboard with an impregnated core and an impregnated surface to minimize the boards water absorption. The sheathing plasterboard is used in external wall constructions, and is airtight, moisture- and water repellent, diffusion open, and gives fire protection. The board is suitable as sheathing on outside of external constructions under permanent cladding, when the construction is expected to be exposed to weather conditions over a longer period. The plasterboards have straight paper lined long edges and short edges sawn straight. It is available in 1200 mm width (GUB 9) for external solutions.