The stiffening of the floor joists is then achieved by carefully screwing the finished parquet.
Chipboards are suitable for floating laying on raw concrete ceilings. Chipboard can also be laid over existing floor structures, if they are not sufficiently insulated or if they are lower than the adjacent floors. “Floating” arrangement of boards, i.e.. without contact with construction elements on insulating materials, has this great advantage, that the transmission of noise from footsteps and noise from the floor covering to the room below is significantly reduced.
An application is required for effective noise isolation “soft” insulating materials, which are in the form of mineral fibers, granular insulating materials of cork or inflatable volcanic rock. Hard foam boards, known as “Styrofoam” they do have a high one, thermal insulation efficiency, they have, however, only a slight insulation of the sound transmission.
Before applying the insulation layer and chipboards, the raw ceiling must be dry and clean. Any mortar remnants must be removed and a polyethylene film insulation against moisture should be applied (grub. 0,2 mm). The foil should overlap at least in width at the joints of adjacent strips 30 cm and extend onto all walls in height 10-15 cm.
First, edge strips of the insulating material are placed around the walls. In this way, direct transmission of sound to adjacent rooms is prevented. Dry-screed boards made of mineral fibers are suitable as insulating material, cork, soft felted fibers or hard foam. The insulation boards fit tightly at the joints anyway, that there are no cross gaps.
By two-layer arrangement, with offset joints, higher insulation efficiency is achieved, and thus additional energy savings.
Now it is time to start laying chipboard (grub. 22 mm) in one corner of the room. The first board is placed at least 15 mm distance from the walls and inserts wooden wedges into the expansion and ventilation gap, which, for the time being, prevent the disc from shifting.
The groove of the second board is filled from a bottle with white synthetic resin glue and this board is tightly seated in the first board.
The second row begins with the remainder of the last board of the first row. This avoids waste and unnecessary cross gaps.
When the entire surface of the floor is laid, the boards are pressed down by carefully tapping the wedges. These wedges are removed after 24 hours.