Mounting hole with gypsum board: to design ceiling openings (e.g. attic ramp). We have two types of gypsum board mounting holes. While the vapour-resistant gypsum board mounting hole means a 12.5-mm thick vapour-resistant gypsum board insert included in an aluminium frame, in the case of the mounting hole with vapour-resistant gypsum board, there is a 12.5-mm thick standard gypsum board. It is also known as Revision door