My Wood Burner Flue Pipe Joints Are Leaking

Creosote Drip

• Creosote drip is caused by the buildup of creosote inside the chimney pipes. This is a mixture of carbon layers that bond themselves to your pipes as smoke lingers in the chimney. It is extremely flammable, can burn very hot, and is very difficult to get rid of. When combined with condensation, the creosote can actually drip out of weak joints in the flue pipes. Flue pipes need to be properly installed and maintained to prevent this problem from occurring.

Overlapping Joints

• Overlapping joints are necessary when connected wood burner flue joints. Connection pipes should always be as large as the flue collar they are connected to. The joints need to overlap by at least 2 inches to provide maximum support and protection against leaks. You may also want to consider installed a larger pipe to increasing airflow and remove the possibility of condensation or creosote problems.

Vibration and Securing

• If you have installed your flue pipes correctly, remember to keep an eye on them. Chimney fires can cause serious vibration in the pipes that may shake them loose and create leaking problems where none existed before. Use several screws to tightly secure the pipes to the collar, and seal it with fire caulk or a similar material.

Brands and Repairs

• When you buy new pipes to replace your old versions, always buy the same brand because different brands have different connection techniques that they use. Always buy pipes rated for use on your wood stove, the class A chimney pipes. Do not vent through a combustible wall, and if you want to make any remodels to remove the need for a joint, consult your local building codes first.