Installing an interior door into a gypsum fiber& Brick opening (Europe)
I recently bought a house in Switzerland, but I am from the USA, and I am not familiar with the construction methods used here: Concrete and rebar load bearing walls, mostly plaster covered hollow brick walls for the interior walls. In constrast my parent's house was all wood frame, and that's what I learned to work on helping my dad as a kid.
The previous owners had knocked out a wall dividing two small bedrooms to make one large bedroom. For the new single door opening, they constructed a new small section of wall with an opening and door themselves- very poorly. It was framed with wood and MDF panels, not flush with the wall, and they filled the spaces between the wood with pieces of styrofoam(!).
I knocked that down. We had a renovation company do some work because there was too much to do before we moved (have to consider costs of a few months paying a mortgage and rent at the same time). The renovation company constructed a new wall and door opening. It was made with gypsum fiber panels, and I guess some red brick (see photos)
The opening is 88 x 205 cm. The thickness is 8-8.5cm including the plaster coat. All the videos online I see about adding interior doors start with wood frame interior walls.
I was thinking of buying this: https://www.hornbach.ch/fr/p/cadre-complet-pertura-cpl-blanc-similaire-a-ral-9010-201-5x85x9-0-cm-norme-ch-gauche/10339403/
Would that work? Do I need to go to the next size up in height (211 cm instead of 201.5 for a 205cm opening) and cut it shorter?
Can I mount such frames directly to the brick and gypsum fiber wall (with shims in place), or do I need to put a wood frame in place first, and then mount the frame to that?