PVC frame. The frame complies with the provisions of § 4.1.2.1. It must be placed in an opening created in concrete, brick or cellular concrete walls with a minimum thickness of 90 mm. Lightweight partition walls should not be used. The different shutters that make up a door must be separated by a trumeau, which must have the same characteristics and stability as the wall, in which they are installed. The frame must be square and level. The PVC profiles are fastened to the wall at 600 mm intervals using screws and the appropriate plugs (minimum diameter: 8 mm). If the door is fitted in a cellular concrete wall, it must be secured using torpedo plugs at 600 mm intervals. If the perimeter of the opening is not sufficiently smooth and a clearance of over 3 mm is created between the profile and the wall, it will be necessary to place rockwool between the wall and profile.
