One old and virtually free method of capping off or sealing a chimney that is generally no longer used is to make a lead cap.
Capping off an unused chimney.
These can simply be made out of a scrap or an offcut of lead beaten into the correct shape and bonded to the top of most chimney pots to effectively seal it and make it waterproof.
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.
Take measurements for the length width and height of the chimney s flues.
Climb onto your roof to inspect the chimney.
Simply cut a tight fitting plug out of foam insulation and block the hole on the bottom.
Other helpful maintenance.
The bottom is even easier.
Why should unused chimneys be capped.
Capping a chimney off with a slab is well not may favorite at all.
How to close an unused chimney.
If bits of brick have crumbled inside or if there is significant decay consider calling a.
Extend the tape measure to find the total combined length of all the flues.
Place the end of your tape measure against the side of the flue which is the clay or metal tube coming out from the top of your chimney.
Insulating the bottom of the chimney once you ve capped the top of the chimney you will need to insulate the bottom of it.
If you are only talking a few feet of redundant flue then you ll probably be ok with fully capping after reducing the height with a single vent left in the blocked up fireplace.
You may need to use a screwdriver to loosen screws holding it in place.
Remove the cap on the chimney.
Then measure across your flues to find the widest point.
If you decide to cap your chimney off yourself please make sure you use the correct ladder safety.
Measure all sides of the.
The rain cannot get in but it is not sealed air tight which does allow any inside moisture to slowly get out.