Wednesday, February 19, 2014

Woodburning Stove Flue Installation

Wood-Burning Stove Flue Installation


All wood-burning stoves or fireplaces have a chimney connector, also known as a flue. The flue is the most critical part of the fireplace or stove. Common wood-burning-related fires start in the flue, both because of incorrect installation or inadequate maintenance.


Check Insurance and Building Codes


It is critical that the fire stay inside the wood stove and not in your home. Choosing and installing a flue for a wood stove is usually best left to professionals. It is also a good idea to check local building codes and talk to your homeowner insurer before installing the flue. Insurance may not cover damages if the unit was not installed by a professional. Know the building codes for the installation, location and type of flue required. The codes could differ slightly, depending on the type of structure. For example, manufactured homes have stricter building codes.


Three Types Of Stove Pipe


Stove pipes are single-, double-, and triple-walled, each able to handle higher burn temperatures. Building codes require a minimum distance (usually 18 inches) away from a combustible wall and a minimum height between the where the flu connects to the stove and the top of the hearth. The hearth may need to be adapted before you can install the flue. Double- and triple-walled stove pipes are shielded, so they put out less heat, reducing the required distance from a combustible wall. Stove pipes cannot be installed where they penetrate a ceiling, wall, attic, roof space, closet, or any concealed space. Never use galvanized metal for a flue pipe as the metal releases a dangerous gas at high temperatures.


Installation


The best flue installation uses the shortest and most direct route possible between the stove and the chimney, and is straight. However, if you use flue pipe joints, they must overlap and have at least three sheet metal screws at each joint. Fasten the flue to the flue collar and the other end to the chimney. The crimped ends of the pipe are oriented toward the fire box. Single-wall pipe should have an inspection wrap. Building codes will tell you maximum length requirements for the flue; the maximum horizontal length allowed before support is required; how many elbows are allowed (usually two); how much overlap is required in the joints; the upward slope on the flue pipe; and the diameter and gauge thickness of the flue pipe. In addition, a flue must either have a cleanout or be able to be removed for cleaning.








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