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How To Install Plasterboard
Plasterboard is made up of heavy paper lining filled with a gypsum core. To cut plasterboard you only need to cut through the face of the plasterboard board sheet with a sharp trimming knife blade. Snap the plasterboard along the cut in the face. Then cut the paper lining from the back of the plasterboard sheet.
The job is made easier with a plasterboard tee square. These can be bought for a small cost from any plasterboard retailer. Tee squares come in 1200 mm and 1350 mm widths.
Plasterboard is easier to cut if it is standing up rather than laying on the floor, as you can walk behind the plasterboard sheet to cut through the liner.
If your plasterboard sheets are stacked flat, cut the face of the plasterboard sheet then raise slightly the plasterboard sheet where you made the cut. Now you can make cut through the back liner from the face of the plasterboard sheet. Only cut from the center for about 600mm then lay the plasterboard sheet back down, go to the end of the sheet and pick the shortest end up about 300 mm, holding both sides give the sheet a flick and you will get a clean break without delaminating the liner. With a bit of practice, this method can also be done with the plasterboard sheet standing up but when you flick it back the sheet needs to be upright, not leaning back.
Making a horizontal cut along a plasterboard sheet is the same cut and snap method as described above, but can be difficult if you are on your own. To make this easier, after you snap the plasterboard sheet don't start cutting the back from the end, start about 600 mm from the end. This will stop the strip from falling away and breaking. Cut all the way along stopping 600 mm from the other end, go to the center of the sheet, then with a sharp snap back toward you, the plasterboard strip will break cleanly allowing you to have control, preventing the plasterboard strip from breaking.
Cut outs for doorways are easier, nail the plasterboard sheet over the doorway before cutting out the door opening. This will prevent you from breaking the plasterboard sheet while lifting it into position. To cut out the doorway, use an old saw, using the door stud as a guide cut up both sides until you reach the door head. Then using the door head as a guide cut the back of the plasterboard sheet, fold the it outwards then cut the face along the crease.
Cut outs for windows are different as you can't go behind to cut back of the plasterboard sheet. You have 2 options, either cut the opening out before fixing the sheet, or fix the sheet over the window then cut out the opening.