For plastering gypsum plasterboard constructions of arched type, you will need to study the technologies of flexing of plasterboard. There are only two such technologies, it is possible to bend the drywall as it is mounted, or you can prepare a ready-made bent part.
First of all, you need to cut a piece of drywall of the required size. This operation is quite simple: place a square along the end of the drywall sheet and use a knife to make a deep cut. Then bend the drywall along the cutting line so that to break the core of the gypsum. Then, what you will do is to cut a layer of paper from the back. Make sure that the cut piece fits you in geometric dimensions.
There are two methods of giving the gypsum board a curved shape - applying multiple parallel incisions and moistening its surface. The first method is used when you only need to bend the drywall a little. The second method will be useful when Gypsum plasterboard should be given more roundness. In the last version there is an alternative way: you can apply two layers of drywall thickness 6.5 mm (arched gypsum board), as it is easier to bend, or plywood thickness of 6.5 mm plus plasterboard of the same thickness.
From our own experience, we recommend, before working with large sheets drywall, practice on trimming. Do this several times, you will it is clear how to bend drywall with your own hands - such a job is quite within your power.
This method is used as a rule for the construction of interior arches, where you need to bend the plasterboard in an arc with a large radius. Here, to bend the drywall, you will have to make cuts on it every 30-50 mm. Put a piece of plasterboard on a flat floor surface or lean it tight against the wall and, using a ruler (in our case - the building level), make a sufficient number of parallel incisions. An incision of the cardboard layer from the front side of the plasterboard will make it easy to deform it, and the remaining layer of paper from the back side will hold a piece of drywall together.
Then you need to break the gypsum core in the places of the incisions, in order to make the piece of drywall very flexible in one plane. If you did everything correctly, then the plasterboard can be bent very easily, and you can easily give it the desired arc shape. When using this method, you must constantly monitor that the reverse layer does not break cardboard. Of course, it is simpler than a wet bend on the template, but has its drawbacks.
Now you need to align part of the future gypsum plasterboard arch with the wall plane and attach it with screws for gypsum board. Do all the work with great responsibility, so that its result justifies your efforts.
We advise you to fix a curved piece of gypsum board every 30-50 mm. For convenience, use a screwdriver with a torque regulator, this will enable you to screw in the screws quickly and reliably. In addition, be sure to make sure the rigidity of the frame to which you are attaching the drywall is sufficient, otherwise the arch will stagger.
You may suddenly feel that the arch built by your hands does not look very attractive. We hasten to assure you that no You will not notice any flaws, after gluing the serf cutter and applying several layers of putty.
Bend plasterboard can and method of moistening one surface plasterboard sheet. If the sheet needs to be bent rather steeply, both sides should be moistened. Drywall should be placed on a perfectly flat floor and moistened with a paint roller or sprayer. If a sheet of drywall should be moistened very much, then you can use a foam rubber sponge. But remember that an excess of moisture can easily damage the material, so it's necessary to moisten the drywall a little.
Before you begin already to bend, the water should be completely absorbed into the plasterboard, this will take about one hour. Work with extreme caution, since the wetted panel is easy to break. After giving the sheet drywall the required shape, you need to strongly ventilate the room to dry the moistened drywall.
Do not wet the sheet drywall too much, as the facing cardboard will tear.
After fixing one edge of the drywall sheet, bend it step by step, screwing the next screw for the gypsum board. Carry out the installation meticulously, so as to get a smooth curve. Self-tapping screws should be placed in steps of no more than 150 mm, otherwise your arch will come out with waves.
Screw the screws carefully so as not to deform heavily the plasterboard, because then you will have to work harder on the finishing puttying of the plasterboard surface with putty.
As you can see, bending drywall is not a problem, as it may seem to you at first sight. You just use the convenient progressive tools and technology to do the job on a professional level.
For bends with a very small radius, you need to make cuts on the back of the gypsum board every 30-50 mm. If you only need to bend the drywall, then it should be moistened with a sponge or roller. We advise you to plan the sequence of all actions at the beginning of the work, this will eliminate possible errors.
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