Siniat Standard Board with an additional laminated vapour control layer. The Siniat Vapour Board has the same physical property as the standard board but has a silver metallised polyester film back liner which enhances the vapour resistance of the product (Type A to EN 520). Siniat Vapour Board can be jointed and finished with Siniat Jointing Systems. The boards require priming with Siniat Universal Sealer prior to decorating.