Sealing the chimney bricks remember to allow the crown sealer to dry out completely before beginning the second stage which should not take more than two hours.
Sealing an unused chimney thimble.
Usually unused chimneys are capped off with a bent sheet metal covering and perhaps a wire strap or weight on the top.
Leaving the duct tapes lying on the roof especially if it is windy will increase your cleanup job later.
It s important that your chimney service technician checks that the area that gets closed off has a lining.
There is one important detail for the top cap.
Sealing your older unused chimney should not be a complicated task as long as attention is paid to prevention of air intrusion as well as environmental and pest control.
Apply a bead of butyl rubber caulk around three sides of the chimney at the top and set the cut piece of metal on the chimney so the edges line up with the caulk bead.
Watch this video and see how.
It must be a complete rain shelter not just the spark cap that is normally on a chimney but at the same time it must not be sealed air tight.
Press the metal into the.
If there s no lining due to the flue then a new one needs to be installed.
You can do it yourself in a few hours for a few bucks.
The proper way to close off a thimble port is with brick and mortar to create a solid and safe enclosure.