How To Seal An Unused Chimney Top

Does an unused chimney need ventilation.

How to seal an unused chimney top.

If your damper is near the firebox you can use insulation to seal the chimney. How to permanently block a chimney. Seal unused chimney top and bottom about the author renee miller began writing professionally in 2008 contributing to websites and the community press newspaper. Gradually move to the top of the chimney.

Installing the chimney cap. How to temporarily block a chimney. But for a masonry chimney that has a clean out in the basement tape that clean out air tight as well because it can be a source of warm moist air getting inside the closed chimney. Wait for at least 10 to 15 minutes before applying the second coat and once again begin from the bottom.

While you do want the top capped you should not seal it off completely. This way you or the next owner have the option to have it open or closed at will. Even if you are not comfortable with climbing up to the roof and doing it. Closing down an unused chimney.

The long term savings associated with sealing the chimney has already been mentioned. When retiring a chimney many chimney experts recommend using roxul a hydrophobic mineral wool insulation which means that it will dry out if it ever gets wet. If you want an easy way to temporarily block and unused fireplace flue to stop a draft you should consider installing a top sealing damper. Capping the flue is one of the best ways to close up the top of the chimney as it will still allow air to get in and out preventing condensation from building up.

Plug and seal air tight the horizontal line at the level of the vapour barrier in the house and cap the top. I have found the best way to seal an unused fireplace flue is to install a piece of slate or thin stone on top of the unused flue tile using masonry caulk to adhere the stone. Sealing and insulating the clay flue at the top and bottom of the stack will ensure the job will yield these desired results.