Although it may seem a daunting task to repair holes in plaster walls, it is a simple project that with the right tools and instructions you’ll wonder what all the fuss was about.
SMALL CRACKS OR HOLES
Firstly you need to prepare the area by removing any loose plaster with a utility knife and any dust with a damp sponge or vacuum.
Now mix your plaster cement following the instruction or simply use a pre-mixed product.
Apply the ﬁrst layer with a ﬁling knife, clean with a damp sponge and allow 4 hours drying.
Now apply a second coat if necessary, clean with a sponge and then sand to a ﬂush level with the wall.
The main difference when repairing larger holes is that you will need to cut around the damaged hole and use a supporting backing due to the larger repair area. Here are the steps.
REMOVING DAMAGED PLASTERBOARD
Cut out a piece of plaster, of the original thickness that will ﬁ t over the damaged area and then mark its outline. Using a screwdriver punch a hole in each corner of the marked area and then diagonally cut toward each corner with a keyhole saw. Take care not to puncture plumbing or cut electrical wiring. Breakaway and remove the pieces carefully.
INSTALLING NEW PLASTERBOARD
Find a piece of timber and screw it behind the existing wall (countersunk) to act as a backing for the replacement board. Clean the area of any dust and apply adhesive to the timber board. Position the replacement plasterboard into the hole and secure with joining tape
– don’t overlap tape.
FINISHING THE JOINTS
Using a filing knife, apply a thin layer of ﬁling compound over the joints until the tape and screw holes are covered. Allow to dry and then sand (medium grit). To make the repair less visible, apply a second layer of ﬁling compound with a broader spread. Allow to dry, sand with a ﬁ ne grit paper and then paint.