To brick, the fireplace’s opening follows the guidelines for bricklaying. Place the bricks in courses, keeping the bricks’ faces in line with the brickwork. This will permit you to put down a layer of plaster.

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If the fireplace’s opening is greater than 1.2m (4ft) in width it is necessary to tooth-in either edge of the opening in which the fireplace was placed. This will join the newly constructed brickwork to the wall before it, giving it greater force. For the effect of teeth remove the half bricks located on each side of the fireplace.

A brick with an air gap must be installed during the second or third course to prevent moisture from accumulating within the smoke and soot deposits inside them and then forming damp zones. If there’s an area of the gap on the top of the opening that is more than 25mm (1in) or greater the gap is filled with slates or even part tiles.

After the brickwork is completed then you can apply plaster to it so it blends in with the remainder on the wall.

Opening up

To stop a fireplace from advancing you could utilize a piece or a block of plasterboard to act as an alternative to bricks. The board must be cut properly so that it can fit snugly into the area.

Utilizing timber battens 50mm in size (2inx2in) build an enclosure around the inside edges of the opening, moving it back a bit to allow the length that the frame.

If the opening of the fireplace is larger by more than 600mm (2ft) It might be necessary to put in an upper central batten that will hold the middle of the plasterboard.

• Install the plasterboard on the battens to ensure it’s perfectly aligned with the wall.
• A ventilator plate must be installed in the plasterboard to the lower part of the fireplace in a central place.
• In addition, reinforce the board by securing the edges. Apply a coat of ready-mix skims to match the wall.

If the opening that needs to be closed is attached by a standard flue and serves a fireplace being used, don’t install a ventilator plate since hot ashes could pass through it. When you are boarding the opening, use an open-air fire-checking building board.