How To Seal A Fireplace Chimney

Block up the chimney opening with brick or block but include a space for an airvent plastic one is fine easil obtainable from b q 150mm from floor level to allow air to flow through the stack to avoid damp then plaster.

How to seal a fireplace chimney. Some of the repellents will drip down. 7 other ways to fix a drafty fireplace. Now pour the water repellent sealer into the low pressure sprayer and spray it evenly all over the chimney. Even new cast iron dampers allow air loss.

Insulating the bottom of the chimney once you ve capped the top of the chimney you will need to insulate the bottom of it. Even when your fireplace is blocked off airtight you ll still end up with hidden water issues. These old chimney flues can cause drafts and pull heat out of your house. The previous owners had the top part of the chimney stack removed.

Just a quick tip to seal that old unused fireplace chimney flue from the inside of the house. Get them sealed up. It now finishes in the loft at upstairs ceiling level. Plain and simple do not seal off a chimney or fireplace because you will get a flue full of condensation problems.

One is an inflatable balloon type product that will seal the flue. That will prevent air from flowing up through it. So line it up make sure you re in the right spot and then press down. Remember that all chimney flashings need to be masked off prior to applying the sealer.

If you want to seal your fireplace off for good the easiest way to do so in a hurry is to cut out a foam insulation plug place it at the bottom of your chimney and caulk or weatherstrip it in place. One of he best methods for closing up the bottom of the chimney depends on whether you want it sealed permanently or temporarily. You have to start from the bottom and spray the sealant on the bricks evenly. Put on heavy work gloves and use tin snips to cut a piece of sheet metal to the same measurements as the chimney opening.

Just make sure you put a generous bead of silicone caulk all the way around the rim. For a more lasting seal check out this diy article on how to permanently seal an unused fireplace. I have an unused chimney fireplace that has an electric coal effect fire and wooden fireplace surround. Apply a bead of butyl rubber caulk around three sides of the chimney at.

And you ll be able to get a nice bond between the chimney and the metal and that will hold it down and make it air tight. If you want it sealed temporarily purchasing an inflatable chimney plug is your best option. Unused though they can waste a lot of heat up the chimney. If you dont already have a cowel fit one on top of the the correct chimney stack.

But these problems are only hidden for so long.