Capping Off A Chimney Flue

Flue ventilators can be found on our chimney potpage.

Capping off a chimney flue. Get onto your roof with a ladder. You should cap any unused chimneys with a flue ventilator. The flue ventilator stops rain entry to the chimney but still allows a small amount of air passage for ventilation. Chimney cowls for capping chimney cowls are normally used to adequately ventilate chimney flues connected with an appliance like gas fires open flame gas fires wood burners coal fires etc.

However a standard chimney cowl can provide a good alternative to capping a chimney or if you think you may use the flue later to connect an appliance. Put on heavy work gloves and use tin snips to cut a piece of sheet metal to the same measurements as the chimney opening. Use a ladder that extends at least 3 feet 0 91 m above your roof so you can. Find the flue on your chimney which is the clay or metal.

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. Apply a bead of butyl rubber caulk around three sides of the chimney at. Buy a cap that has the same length. Measure the length and width of the flue on your chimney.