Walls with significant cost reduction
With Rigips wall system you can: rationally encase the existing walls or set up partitions with substantial cost savings. Plasterboard panels can be also glued to the walls. With the application of the suitable insulation material significant acoustic and thermal protection improvements can be obtained.
Partition walls and wall coverings with significant advantages
With the construction of Rigips drywalls, significant cost savings are achieved in comparison with conventional walls. Hollowness of walls is ideal for rational implementation of the installation of all types. At nearly dry, flat surface paint, wallpaper or tiles can be applied. In terms of sound insulation and fire protection RIGIPS walls can be compared with any other ones on the market.
Lining the walls
First, we should clear the distinction between the dry plastering by pasting plasterboard plates on a massive wall and coating very uneven or poor load-bearing wall by adding additional substructure in front of the wall.
When preparing for dry plastering by pasting plasterboard onto the connective glue, the biggest attention should be paid to dryness of the base. If you have problems with capillary moisture, leaks or freezing of the walls, dry plastering is not recommended. While lining concrete surfaces they must be clean - previously removed traces of mortar and plaster, wax or oil from the formwork, and the fresh concrete must be thoroughly dry. Smooth concrete surfaces must be pre-impregnated (R-Kombikontakt) and highly absorbent (aerated) concrete must be processed with the basis (R-Kombikontakt).
If the combination of the wet and dry plastering is applied, first you shoud apply the wet plaster, and then the dry plaster - after the wet plaster has already dried out. The basic rule is that the walls are coated prior to the ceiling.
Connective glue Rifix applies at the dry plastering of the massive walls by pasting plasterboard thickness 12.5mm. The dry mortar is not suitable for wet and damp walls, nor to enhance the sound or thermal protection of poorly insulated walls. Large-size plates or plates that are both tailored to reach from floor to ceiling are applied for effective and quick lining. Before applying rigips boards you should install all the concealed installations.
Distribution and plug in boxes are set so that they protrude about 2 cm - openings should be carefully cut from plasterboards at those places. On a boards which are set at the full height of the wall (up to 15 mm below the surface of the ceiling!) bonding adhesive is applied by spotting (as shown on the picture).
In the band around the window niches and other indentations board should be completely covered with adhesive. Board with adhesive should be pressed against the wall, and then carefully aligned with surrounding boards with the rubber hammer. Cutted pieces of boards are set by the floor to create spacing of 10mm (5mm against the ceiling) for air to flow and dry the adhesive more quickly.
Pasting the rigips-tape: Narrowly cropped strips of plasterboard-plate (12.5 mm) are applied to the walls at the distance of 60cm to even out bigger irregularities on the old walls. By controlling the thickness of adhesive and pasting vertical strips you can create the smooth and flat surface ready for proper paneling.
Pre-wall shell on a wooden laths: Wherever your uneven wall prevents you from the proper installation of the plasterboard panel, making the substructure of laths (30/50 mm) is recommended which are then applied to a gnarled wall with the dowels and screws. All the front edges are aligned in the forced plane by inserting pins and pieces of lath. Lath are placed at the intervals of 100 cm, and plasterboard panels are attached to them by screws. Insulation wall panel: If the wall panel needs to improve thermal and acoustic protection, insulation material is applied on the wall between the laths of wooden substructure. If this protection is applied on the inner surface of the outer wall, barrier should be set over the insulator. Plasterboard panels are applied to the laths with plasterboard screws of 35 mm length, at the 20-25 cm spacing.
Free standing pre-wall shell is set on the places where uneven wall should be smoothed or installation installed. In doing so, in the cavity of this substructure insulation can be applied to improve thermal and acoustic protection. Standard plasterboard UW/CW profiles, CW profiles of the 50 and the 70 mm width and standard rigistil-profiles or wooden girders section 6 x 6 cm are used for building the substructure.
Mounting the substructure and paving: These pre-wall constructions are made analogous to plasterboard partition-walls structures. If the pre-wall shell with built-in thermal insulation is placed in front of the outer wall, vapor barrier should be set up below the plasterboard boards paving.
Pre-wall shell on the adjustable holder: By applying UW-profiles or wooden laths (30/50 mm) attached to the adjustable steel holders relatively shallow pre-wall construction are formed. Holders are set by the vertical line, on a horizontal spacing of 60 cm. They are attached by the dowels and screws, and their back side should be covered by the self-adhesive sealing tape. After mounting, the ends of them are bent at right angles from the wall and screwed onto the sides of the profile or laths. UW-profiles or laths are free to move within the holder and easy to erect in the upright position, regardless of the unevenness of the wall.
The isolator is affixed to the wall between the laths or profiles, and then the projecting ends of the holder are perpendicularly bent once more, this time by an isolator. Finished substructure is then lined with plasterboard board thickness of 12.5 mm by machine-twisting plasterboard screws (35 mm) in the UW-profile or laths at the intervals of 25 cm.
Construction solutions
The practical construction solutions: Pre-wall shells coated with layered rigitherm-plates and filled with mineral wool, provide targeted heat protection. If this construction is applied to inner surface of the outer wall, installation of a vapor barrier is necessary which will prevent the occurrence of condensation within the insulation lining. The necessity of installing vapor barriers or brake is determined by the thickness and the type of material of the outer wall, and can be determined by the budget. Pipe with water may not be placed between the outer wall and the thermal insulator. Thermal protection of the outer wall can be improved by pre-coating layered rigitherm boards affixed with a layer of insulator (mineral wool or polystyrene).
As the polystyrene (PS) is characterized by high resistance to water vapor, with the installation of such insulators installation of additional vapor barrier is not always necessary, especially to buildings with breathable outer wall. However, additional vapor barrier is required in front of the walls with slow or low vapor diffusion (eg, concrete, clinker, natural stone) or at the walls with the vapor sealed outer coating. Layered rigitherm-panel insulator mineral wool (MF) require setting up additional vapor barrier on the inside of the shell, thereby preventing the occurrence of condensation in the pre-wall hollow shell.
For additional vapor barrier aluminum (Al) or polyethylene (PE) film are placed between the plasterboard panel and thermal insulator. Type, thickness and water vapor permeability of the film depends on the physical conditions at the site and on the installed materials, and can be determined by the budget.
Construction plasterboard can, if necessary, be ordered with the laminated aluminum foil 30, PE-foil or with reinforced kraft paper, which is a practical solution in the execution of the dry plaster plasterboard. Improving sound protection performance of the pre-wall shell depends primarily on the distance between the wall and the plasterboard-paving and the mass of a plasterboard panel itself. With the single-layer paving on the right distance from the wall noise reduction of 15 dB is easily achieved, which corresponds to a three times improvement compared to the bare wall. For sound insulation of voids in the structure the best fits are soft, relatively massive and absorbent materials, eg, stone or mineral wool.
Plasterboard layered roofing panels are designed for thermal and sound insulation of the roof, but you can use them and in pre-wall constructions. They provide better insulation Rw-values, regardless of the level of the so-called longitudinal noise in the construction.
However, the real improvement of insulation qualities of the barrier between the two rooms - expressed in a difference of normalized values of noise level Dn, t, w, depends primarily on the spread of longitudinal noise in peripheral elements of the building on which the barrier is attached to. If the noise spreads through the barrier due to its low mass, badly applied insulation, air ducts or poorly sealed connection elements, the condition can be significantly improved by the proper execution, better insulation or increasing its weight by the additional paving.
If the assembled partition wall has the satisfying mass and a good insulation, that is a sign that the noise from one room to another spreads through the adjacent building elements and can't be significantly muted by the interventions in the bulkhead. In that case, the longitudinal expansion of the noise can be prevented only by the additional coating insulation of the adjacent building elements.
