Texts for specifications


Text for specifications concerning plaster block walls

Non-load-bearing partition wall 


Walls - Promonta gypsum blocks


Concern :

All Non-load-bearing partition wall.


Description :

-   Promonta massive solid gypsum blocks has two perfectly smooth surfaces. The blocks are provided with square designed tongued and grooved edges to ensure a perfect nesting. They are bonded to each other by means of a glue based on plaster, the Promontine.


-   The first bunch of blocks of all partition walls and the all entire wall in wet rooms (such as bathroom or shower rooms) are made using waterproof blocks treated in their mass. In case of the surface of the floor is very uneven, the first pile may be placed on mortar or a mixture of glue and plaster.


-   The different materials form a system and must be provided by the same manufacturer.



-   Building is performed by authorized personnel and is perfectly done to get a finished wall ready for the painter or wallpapering (a really thin smoothing with Promolis).
The blocks are laid on the floor. A polyethylene sheet with a width of 40 cm may be placed under the wall to prevent from any risk of rising moisture.


-   The vertical connections with the structural elements are made by direct bonding with glue. When several walls have to be bonded to each other, the successive rows must switch.


-   A lintel shall be placed above the door for openings wider than 1 m.


-   The remaining space between the top of the wall and ceiling shall not exceed ± 2 cm and is filled with polyurethane foam. The overflowing foam will be cut flush with the wall after hardening. The horizontal joint will be finished using a strip embedded in a mixture of glue and plaster.


The finishing should not be applied where tiling are foreseen.


The system must be performed according to the requirements of the technical approval ATG 2103 delivered by the UBAtc.


Spécifications :

-   Density : according to acoustic requirements

  • 800 kg/m³ (± 5%)
  • 950 kg/m³ (± 5%)
  • 1250 kg/m³  (± 5%)


-   Thickness: 5/7/8/10 cm (according to plans)

-   Code of measurement: m². Openings less wide than 1m² are not deducted.

-   Nature of the market : Presumed quantities ( PQ)

-   Conform to European requirements

-   Fire resistance : minimum 3h






  • Promonta gypsum blocks should be used as far as possible after the building is glazed and watertight.
  • The gypsum blocks are connected together in a stretcher bond into a continuous whole, using a special gypsum adhesive based on fine gypsum and additives (Promontine).
  • After the wall has been aligned on the weight-bearing floor, a plastic sheet may be used. Rough floors should be levelled on beforehand.
  • The blocks are installed so that the 50 cm sides are vertical, with the tongue facing upwards. As the blocks are fitted together, the gypsum adhesive is forced out of the joints. It can be wiped away and the joints smoothed off later on.
  • The top joint against the ceiling is filled with a PU foam to obtain a flexible joint.
  • After openings for electricity and sanitary lines have been drilled, they are sealed with plaster to a depth of ± 2 mm below the surface. This work should be carried out by the relevant specialists.
  • The walls are finished with gypsum adhesive or by a finishing adhesive, Promolis. In this way, a smooth wall is obtained, ready for papering or painting. If the walls are tiled or treated with abrasive mortar or a similar material, the gypsum wall should not be sanded.
  • If the gypsum blocks are decorated (e.g. painted or papered), this should be done according to the manufacturer's guidelines.
  • Generally speaking, a primer should be used.
  • Between concrete or brickwork, the walls should protrude ± 1.5 cm to enable plastering to take place in the same plane.
  • Prominent corners should be finished with a fitted corner profile.
  • Measuring: any openings of less than 1m² should not be deducted. Slanting walls should be measured as though they were regular.