How To Build A Block Chimney For A Wood Stove,beginner woodworking training for kids,Homemade Garage Workbench Plans,Aromatic Cedar Wood Veneer - PDF 2016

26.06.2014
Masonry Chimney Construction can be done by yourself but you need to follow a few guide lines. During Masonry Chimney Construction keep your eye open for combustible material close to the; through wall thimble.
The purpose of the different types of chimneys is to allow combustion, by-products to be vented away from the structure safely without causing damage to the structure they are attached to.
It is important to note that Masonry Chimney Construction building code requirements often vary on a local basis depending on what your city requires. Winter is upon us here New Hampshire and many residents will be using wood stoves to heat their home. People sometimes purchased a secondhand wood stove with no documentation on how to install it.
Next, a noncombustible floor to support the stove called a hearth made of brick, slate, or metal plate is needed. If your home is over 100 years old, there is a very good chance the fireplace does not comply to current standards, something you should have inspected by a professional chimney sweep prior to use.
The stove above has a damaged outer cover possibly due to cracked and missing fire bricks within and overloaded with fuel. Above two different homes both have improper clearances to combustibles, need a minimum of 18" between stove front and floor, very common problem. Creosote buildup seen above, possible causes include unseasoned wood, cool flue temperatures causing condensation on cooler surfaces within the chimney liner, improperly sized flue, and restricted air supply.
If you have a wood burning stove and not sure it has been installed correctly or has not been professionally inspected I suggest you do so prior to use. Here are photos and examples of the wood stove installation and safety details that can help prevent a chimney fire or house fire.
We discuss wood stove installation clearances from combustibles, wood stove draft control or heat output control, wood stove safety checkpoints (including some recommended by the U.S. The article includes wood stove code citations, links to references & researech on using wood stoves, and reports of house or chimney fires related to wood stoves. Most fires in metal factory-built chimneys occur because of improper installation (such as failure to provide proper fire clearance distances or heat shields or both), improper wood stove use or improper or inadequate maintenance such as permitting an unsafe level of creosote to accumulate in a chimney or flue.
Tap on the metal flue: Thumping or tapping on the metal flue pipe connecting the stove to the chimney makes a dull thump rather than a tinny sound.
Creosote leaks or odors: You see creosote leaking out of stove--pipe joints (which also tells you the flue was assembled upside down and may indicate an amaterur, improper, un-inspected or otherwise unsafe installation). If you see heavy creosote build-up, suspect a problem, or have had a chimney fire, a qualified chimney repairman or chimney "sweep" should perform a complete safety inspection. Watch out: if the incoming combustion air cannot be shut down because of leaky woodstove or coal stove gaskets or other damage, the coal stove, woodstove, or pellet stove is unsafe as its burn-rate cannot be regulated. Make sure that your home has appropriate fire extinguishers, located by the home exit doors, and of an appropriate size and type if you use a fireplace or woodstove.


Watch out: people often leave the woodstove door open for a time after lighting the woodstove fire as a way to boost draft and get the fire going. Our tenant Stanley Pyrek left the door to our coal stove ajar to get a fire started, then forgot about it. I'm not so sure the wood burning stove shown at left above is a fire-safe installation, but you can plainly see the manual flue damper handle (pointed-to by our blue arrow) in the rusty flue section about 30 inches above the top of the woodstove. Woodstoves also regulate the wood fire and thus stove temperature by adjusting the combustion air intake to the woodstove. Watch out: if the incoming combustion air cannot be shut down because of leaky wood stove gaskets or other damage the wood stove is unsafe. In our Norwegian Jotul woodstove photo at above right, Paul has installed air-spaced heat shields of ceramic tile mounted on fireproof board behind the stove and he added a heat shield (the silver contraption) on the side of the stove facing a bed just to slow down the heat in that direction. Our photo at left illustrates a house fire that occurred when a wood burning heater was left running unattended. Watch out: if the flue damper rusts or becomes damage it may be impossible to slow the chimney draft, resulting in an over-heating stove and possibly a chimney or house fire. Continue reading at FIRE CLEARANCES, WOOD & COAL STOVE FLUES or select a topic from the More Reading links shown below.
Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. For the most part, they are one of the most overlooked parts of our structures, and rarely are they built according to the local building codes. Typically, the reference used for local building codes is based upon the National Fire Protection Agencies 211 standard for chimneys, fireplaces, vents, and solid fuel burning appliances. Chimney penetrating through the wall thimble shall have a minimum of 8 inches of masonry and 12 inches total distance away from anything combustible.4. The listings in the table below refer to the usable area.The benefit of a square flue is it takes a little longer for creosote to build up, thus prolonging the need for a chimney sweep.
But if you foreget and leave the door open, at least on some woodstoves and certainly on coal stoves or wood-oil combination boilers and furnaces, the result is a dangerously-overheated heating appliance that can either ruin the appliance (by warping the component parts) or it can set the building or chimney on fire. The result was severe overheating of the coal stove, deforming the stove door and other parts so that the stove was no longer usable. At abpve right is a beautiful Jotul woodstove that I (DF) traded to Paul Galow for a fancy wristwatch. The text is intended as a reference guide to help building owners operate and maintain their home effectively.
They are constructed of similar materials and both are subject to many of the same building code requirements. If the masonry chimney cap is constructed with mortar only it will crack severely because mortar is designed to hold at a maximum of three quarters of an inch and not in mass amounts, it has no aggregate to hold the cement together, only sand which is not substantial enough to get any strength out of it.
If no label exists I would not purchase the stove less you can find a manual on the unit for proper installation.


The building inspector would have caught this and saved the homeowner an additional expense of making it right. The purpose is not to make experts out of you - lets leave that to the properly certified, full time masonry chimney contractors. Even though chimneys serving fireplaces, and chimneys serving appliances may be venting different combustion by-products (for instance, a fireplace chimney may be venting solid fuel by-products), they should all be constructed to discharge these by-products at a rate that does not adversely affect the combustion process and to release the discharged material at a height and location that provides fire safety. The chimney cap should be constructed with cast in place concrete, precast concrete or stone. Without the manual the stove may also be missing critical parts, worse damaged and unsafe for use. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order.
However, this Masonry Chimney Construction information may help raise your awareness of possible problems associated with chimneys. The selection of the lining material should be appropriate for the class of chimney service and the type of appliance to it in accordance with the terms of the appliance listing and the manufacturers instructions.6.
If water gets between the flue and the structural masonry, this can cause efflorescence in high humidity areas and it can also freeze, simply prying your cap off your chimney.
The cap should overhang the chimney wall at least two inches and should have a drip edge cast into the overhang.
Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Rain water is now directed off of the top of the chimney and drips off of the overhang.Because the concrete cap and clay flue liner are different materials having different thermal expansion characteristics, there should be a void left between the cap and the flue. According to most building codes, flues may be constructed to discharge their by-products with other flues as long as the following conditions are met:8. This allows both materials to move independently, while the sealant keeps moisture out.All of the measures discussed above are focused on keeping water out of the chimney. The flues are discharging by-products of similar fuels (for instance, you can't combine a flue venting gas by-products with one venting wood by-products).10. When combining flues, the main discharge flue should be sized for the maximum combined flow of both smaller flues.Metal chimneys, also called prefab, class A and Double or triple wall are usually made in three diameters as show below. For this reason, through wall flashing should be placed under the cap as a second line of defense against moisture penetration.
If necessary provide weep vents at base of chimney weeping out on the roof using a # 10 cotton wick, laying it in the bed joint, you can get this at most any hardware store.



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