When rain beats down the metal of a fireplace, or wind howls through it, the fireplace seems like a bad investment. That does not have to be the case, and sealing off a fireplace can prevent many of the nuisances associated with it. Following are the steps on how to effectively seal an unused fireplace.
Hire the services of professional fireplace cleaners to clean it well. Make sure that it is clear of any extraneous debris. Locate the chase cap of the fireplace, which is the pipe that lets out its smoke. Normally, there is a roof-like structure attached with the cap that disallows any rain from entering it. That roof structure has to be removed, as well as the pipe it is connected to. The opening needs to be then sealed with a piece of metal, and additional sound insulation can be achieved by placing a barrier over the fireplace. Finally, the damper within the firebox opening needs to be closed.
The fireplace opening needs to be measured so you have an idea of how much brick needs to be purchased to seal it. Remember to purchase also a few air bricks, those that allow air to flow through it. Once the bricks are purchased, a row of them need to be set about twelve inches inside the opening of the fireplace. In the center of the second row of bricks, an air brick flush needs to be set. Give some time for all the bricks to be set in place.
A thin coat of concrete needs to be applied over the bricks, allowing the air bricks to remain open. Once the concrete is beginning to dry, create scratches using a nail. This allows the plastic to hold fast to the bricks. Allow the coat to dry off completely. Finally, make a mixture of plaster and apply to the surface in a light coat. Continue the process until the entire structure is covered. Make sure to leave the surface of the air-bricks uncovered. Allow the plaster to dry. Installing an ornamental grill to conceal the air brick is the last point of step 3. These can be bought easily at supply stores and glued or attached with screws into place. The chimney flue pipe needs to be covered also.
The unused fireplace needs to be covered, which is initiated by cleaning the surface well. The cleaning of the fireplace and its floor needs to be wiped clean of any trim. Then the bricks will have furring strips glued to them, which will make the surface to which the drywall will be secured. The drywall then has to be hung by attaching it to the strips, and mudding and taping its seams. Finally, the surface has to be painted and primed to go with the color of the room. Install or replace the trim to the ceiling and floor of the fireplace.