False plasterboard ceilings are used both in new buildings and in restoration of old ones. If there are any fire resistance requirements the ceiling claddings are made with fire resistant plasterboards and in wet spaces – with moisture resistant plasterboards. High fire and moisture resistance could be achieved by using cement fiber boards BETOPAN or BoardeX. With the usage of insulation wool in combination with plasterboard planking the following improvements are achieved:
- because of the better heat insulation the heating expenses are reduced;
- better sound insulation;
- better fire resistance;
Installation on a two level suspended metal substructure – system LD112
The metal substructure consists of wire with eyelet, anchor – fix rapid hanger, UD 28/27 track profiles, CD 60/27 channel profiles, cross and profile connectors.•The heights of hanging should be marked and the UD track profiles should be fixed with suitable screws and dowels.
- On the raw ceiling the points of fixing should be marked and the wire with eyelet should be fixed with suitable metal anchor nail 6/35mm.
- The anchor – fix – rapid hanger should be put in the wire with eyelet.
- The bearer profile should be hanged on the rapid hanger. Moving the hanger along the wire with eyelet makes the leveling of the profiles.
- The cross connector with the bearer profiles connects the installation profiles and the distance between the axis should be 50 cm. Two anchor brackets might replace the cross connector. Before furring the construction should be leveled horizontally.
- Start covering the ceiling in one of the corners, and try to begin with a full sheet.
If heat insulation is needed the usage of glass wool RIVATHERM is recommended. The glass wool must be dry for good heat insulation. That’s why a steam barrier is made by insulating the interior warm side of the ceiling. For steam barrier use PE foil or aluminum foil.
- The boards are screwed with self taping screws over the installation profiles. It is recommended to use a drywalling screw driver. During this process the longitudinal edges of the boards should be placed across the profiles. The joints between the crosswise edges of the boards should not be dislocated. There is no screwing with the UD track profiles.
- Before you apply the joint tape and finish totally the ceiling, you will be installing the plasterboard sheets on the walls.
After hanging your drywall, you’re ready for the most critical part of the drywall installation process,- taping and finishing the joints between wallboards
Finishing drywall has three steps to it:
1) Filler Coat:The surface of the boards is cleaned and the joints are filled with jointing compound DERZTEK. It is strongly recommended the usage of glass fiber joint tape, no matter the type of the joint filler. This increases two times the strength of the connection and is the best protection against cracks. When dry, the surpluses of jointing compound are removed with sandpaper. Sand with 120 or 150 grit Sanding Paper.
2) Second Coat: The joints are coated and sanded a second time 24 hours after the first coat.
3) Finish Coat: After another 24 hours, for perfectly smooth surface SATENTEK might be used. If done properly, this last coating should have no need of sanding.
Tip: In order to work from easiest joints to hardest, follow this order for applying the joint compound: start with nailheads, then valley joints (the longitudinal joints), inside corners, outside corners, and lastly the butt joints.