- The multiple strengths of drywall
- Powdered or paste coating for plate joints?
- An application of the roller coating
- Tips for plasterboard bulkhead joints
Smooth and uniform, plasterboards have revolutionized the implementation of ceilings and dubbing as that of lightweight partitions. They require, however, to hide their joints with a coating, usually armed with a special band.
Previously, the walls were covered with plaster pulled to the ruler. As for the ceilings, they received a thin layer of plaster applied to a mechanical lath or thin bricks attached to the floor of the upper floor. This work on the walls and ceilings involved know-how and hands-on professionals.
None of this with the drywall: walls and ceilings, they simply screw on a frame mechanically fixed to the structure.
The multiple strengths of drywall
There is a wide variety of drywall. Those of 2.50 x 1.20 m make it possible to advance very quickly and to cover 3 m2.
Economical (from € 2.50 / m2), they are also easily handled by two, since they weigh only 10 kg / m2. This feature stems from their reduced thickness, 13 mm in standard version: the famous BA13, "BA" meaning thinned edges. These are on the long sides to facilitate the implementation of the joints between plates.
Powdered or paste coating for plate joints?
The joints use paper belts and a specific coating.
The latter also serves to hide the countersunk heads of the multiple screws that secure the plates to their framework.
- In powder (eg in a 25 kg bag), coatings for joint strips look like plaster. They should be mixed with water in a large bucket if possible using an electric mixer to obtain a homogeneous consistency. This is the solution to remember for large construction sites because it is the cheapest option (Axton, Knauf, Lafarge, Placo...).
- The joint plaster is also ready for use. It is then sold in pots of 18 or 25 kg. And for small projects, it is found in 5 kg jars, like the product used here (Kit tapes joints, Toupret). Accompanied by 23 m of joint tape, one strip between two plates, this kit corresponds to about 20 m2 of wall surface (six standard size plates).
An application of the roller coating
Unlike conventional coatings that apply only to the spatula (coating knife), the coating applied here is sufficiently fluid to be used with a narrow sleeve roller (supplied).
The joint strip is then stuck in the coating with a plastic spatula (also supplied).
Then a second layer of plaster is applied (still by roller) before final smoothing with a spatula.
- Using the plastic spatula, cut strips to the desired length with a 5 cm overhang.
- The tape is made of paper and tears without problems.
- The coating is applied here by roller: its sleeve makes it possible to cover the necessary surface with a supplement on both sides of the junction of the plates.
- Load the central area.
- Align the top of the strip flush with the ceiling and center it around the junction of the plates.
- Tension the band and apply it from top to bottom without creating a bubble.
- Marble the strip with the provided spatula or a coating knife large enough to overflow on either side of the coated area.
- Tilt the blade and wipe it regularly.
- At the bottom, hold the end of the band with a spatula and cut off the surplus.
- Use a cutter and a new blade to ensure a clean cut.
- The band perfectly plated on the coating, make it disappear under a new password.
- Apply this second pass in the same way as the previous but without loading in the center.
- Be sure to meticulously smooth the second coat of plaster on the sides.
- With the spatula provided, operate in two stages: first on one side, then on the other.
- After 24 hours, start sanding with a sanding block and a fine-grained abrasive (180).
- Pass the hold across the band (wiper movements) while descending.
Tips for plasterboard bulkhead joints
- To save time, do not hesitate to cut the strips in series to the required length. Increase it by a small margin of about 5 cm to allow a slight overhang in the lower part, which will be cut next.
- As the second plaster run should extend 3 cm on each side of the first, use a (stainless steel) plater instead of the spatula provided.