Dry-Layered Multi-Level Drywall Ceilings
Dry bending of gypsum sheets during the installation of multi-level ceilings with their own hands is based on their relative flexibility and can be used only with large (at least 1000 mm) bending radii. To do this, the sheet is gradually bent, attaching it to the base structure or to the metal frame with self-tapping screws. When installing a multi-level ceiling made of drywall with your own hands, it must be borne in mind that it is possible to bend gypsum boards only in the longitudinal direction.
With a decrease in the thickness of the drywall sheets, the bending radius also decreases. The minimum bending radius of the GCR sheet, depending on its thickness and the method of bending, can be determined from the table.
Installation of Ceilings of Different Levels by Wet Bending
The second method of installing multilevel gypsum plasterboard ceilings is based on the fact that the gypsum plasterboard in the moistened state has much greater ductility, that is, the ability to change shape under the influence of external loads, while it does not collapse. After drying, the sheet retains its shape and does not lose its initial physical and mechanical characteristics.
To create curved forms in a wet manner, it is recommended to use gypsum plasterboards with a width of not more than 600 mm, while the minimum bending radius of a sheet with a thickness of 12.5 mm should be 1000 mm.
Before a wet flexible sheet, when installing a multi-level ceiling from the gypsum board with your own hands, you need to make a template with the desired bending radius. Then cut the blank of the desired size from the GKL sheet, taking into account that it is possible to bend drywall only in the longitudinal direction. Roll along and across the compressible side of the sheet with a needle roller (for convex forms it will be the backside, for concave forms it will be the front side). Lay the workpiece with the side up on a flat surface. At the same time, it is necessary to put gaskets under the workpiece in order to avoid water getting on its backside (otherwise cardboard breaks may occur during bending). Excess water should flow freely from the surface of the workpiece.
Wet the sheet with a sponge, paint roller, brush or spray, evenly distributing water over the entire surface. This operation must be repeated several times until the gypsum core is completely saturated (water should stop absorbing).
The metal needle roller when installing ceilings of different levels is used for applying perforation, which greatly facilitates the process of bending the sheet. With its help, the gypsum plasterboard is perforated on one side, through the resulting punctures with a depth of 5-7 mm and a diameter of 2-3 mm, the gypsum core of the sheet is moistened, which reduces the bending radius.
Set the workpiece on the template so that its center coincides with the axis of the template. The edges of the sheet, starting from the center and moving to the edges, must be pressed to the template, secured with clamps or adhesive tape and left in this position for drying.
The workpiece will dry up in about 20-24 hours. In the case of installing multi-level gypsum plasterboard ceilings, if you need to make several identical elements according to the project, the process can be accelerated. To do this, the bent workpiece is fixed with adhesive tape wrapped around the edges several times. After that, it is removed from the template.