In this master class we will talk about how to mount drywall on inclined planes. You will learn about the professional intricacies of such an installation, as well as how to save time and get the job done right. Detailed photos of each process will make the explanation as clear as possible.
The structure of the frame and sheathing of angular converging planes does not differ from straight sections according to the principle of connections. You can find detailed information about the basics of installing gypsum plasterboard (GKL) in the previous article.
In our case, sheathing of the gypsum board of the attic floor of a multi-gable roof with many large kinks, which repeat the lines of the valleys, ridge and slope mates, is required. Inside there is a vapor barrier and a crate, to which U-shaped suspensions for the profile will be attached.
To work, you will need a standard set of tools – a tape measure, a level, a hydro or laser level, a screwdriver with bits for gypsum board, a grinder. Since you will have to screw in self-tapping screws in hard-to-reach places, we recommend using an angle adapter.
Inclined frame device
The first thing to do is to mark the horizon line of the ceiling in those places where the plane is aligned.
After marking the horizon, we attach the P-suspension and pull the cords for the CD-profile.
In our case, a round lamp with a diameter of 300 mm will be mounted in the ceiling, therefore, when installing the frame, it is necessary to leave space for it.
It is more convenient to cut the profile in place, since it is easier to set a solid guide than to fit short sections.
Note.On sections of a straight ceiling, in accordance with the requirements for gypsum plasterboard frames, only the CD profile is used as load-bearing ribs.
After leveling the frame and installing the sheets on a straight ceiling, we measure out the place where the sheets meet and draw a straight line (red in the photo). This is done using a long rule – the plane is selected with a margin for the thickness of the CD-profile. Then we attach the UD guide to the straight ceiling profile.
Then we mark and fasten the P-suspensions so that they fit under the straight edges. Insert the extreme CD edges into the inclined UD profile, which will serve as beacons. We fix them at the edges and stretch the cords.
Docking of the guides is carried out only in the area of the P-suspension. Profiles must fit into each other, for this the edges must be cut.
Both planes of the ceiling are joined at the inner obtuse corner. At the mating point, there must be reinforcements from the paired UD profile.
For this, the edges of the frame must be free at the edges. Carefully cut the CD-profile of the ribs in place with a grinder (scissors deform the ends).
Install the rest of the edges and put the UD guide on their free ends, check and adjust the plane according to the rule.
Parallel to the aligned corner guide, close to it, set the UD guide (beacon) of the mating plane.
Using the rule and the cords, set the opposite (reciprocal) CD-beacon on the suspensions and stretch the cords. Filling the internal space of the inclined plane to do according to the standard GKL installation technology.
Attention! Position the edges so that the GKL sheet naturally fits the lower plane of the wall. Subsequently, it will be compressed by a horizontal strip, which will give additional strength.
Overhanging mates (valleys) must necessarily have a reinforcement perimeter of UD guides.
The use of foam is justified in all areas of work with inclined planes. The wider it is applied, the more reliable is the fixation of P-suspensions. This is especially important at the junctions to stone walls..
Finished frame type:
Sheathing the frame with plasterboard sheets
Since the size of the sheet is extremely difficult to measure with accuracy, we trim it in place. To do this, we cut out sheets with a margin of 20-30 mm and attach them to one of the planes.
Then we hem the sheets of the conjugate plane to it end-to-end and trim the stock in place.
Before installing cut-to-size sheets, we recommend marking them on the outside in order to accurately insert the self-tapping screw into the rib profile.
The joints of the inclined and vertical planes (the roof to the stone wall) must not only be finished, but strengthened and insulated. To do this, we install a timber or board with a thickness of at least 40 mm on the dowels.
We put the polyurethane foam in the cracks and corners.
We sew a strip of plasterboard, also carefully filling the cracks with foam.
Plaster putty application is a standard procedure, the details of which you can learn from our article “How to putty walls correctly”.
Tip: There is another trick that allows you to create even corners without using a profile corner. To do this, you need to use a temporary beacon that can be made from a rule. Drill 3-4 mounting holes in it and fix on the plane in the desired position.
In this case, the plane will be perfectly flat (if, of course, the rule is even), the corners are formed simultaneously with the plane, and there will be no need to wait until they dry.
The rest of the filling operations are carried out as usual..
Any plane can be revetted beautifully and reliably if you follow the rules for working with drywall. This versatile material is suitable for all surfaces, including round ones. Before mounting on the ceiling, ensure that there is no leakage from the roof by performing a water spill test (simulated precipitation).