National Fuel Gas Code, an American National Standard, 4th ed.Gas Appliance Manufacturers' Association has prepared venting tables forĬategory I draft hood equipped central furnaces as well as fan-assisted Specific to venting of equipment with fan-assisted combustion systems. Specific to chimneys, fireplaces, vents and solid fuel burning appliances. ![]() NFPA 211 - Standards for Chimneys & Fireplaces, NFPA 211: Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, 2006 Edition (older editions and standards are found at the same bookstore).Cranor at 80 or by Email: Thanks to Luke Barnes for suggesting that we add text regarding the hazards of shared chimney flues. He is also a contributor to in several technical areas such as plumbing and appliances (dryer vents). Contact Mark Cramer at: 72 John Cranor is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. Cramer serves on the ASHI Home Inspection Standards. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. Mark Cramer Inspection Services Mark Cramer, Tampa Florida, Mr.Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Questions & answers or comments about the requirement for bracing tall chimneys along a building exterior wall or above the rooftop: why bracing is needed, how it should be installed, chimney bracing specifications, codes Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia Or see this INDEX to RELATED ARTICLES: ARTICLE INDEX to CHIMNEYS & FLUES CHIMNEY INSPECTION DIAGNOSIS REPAIR - homeīRACING for MASONRY CHIMNEYS at Inspect - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.CHIMNEY HEIGHT & CLEARANCE CODE for details about the required height of a chimney above the building roof.In earthquake and high wind areas additional chimney support may be required by local codes, including reinforcement within the masonry structure of the chimney itself.Ĭontinue reading at CHIMNEY LEANING, SEPARATION, MOVEMENT or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. In our photo (above) the loose wobbly brick chimney was not supported at the roof and was not connected to the building - hence it moved easily and was in danger of collapse.Ĭhimneys built on the exterior of a building need lateral support every twelve feet of height as they pass up the building wall - shown in Carson Dunlop Associates sketch. Lateral Support Requirements for Masonry Chimneys ![]() An expert was needed to decide how to make this one safe.Ĭhimney bracing sketches below are provided courtesy of Carson Dunlop Associates. If the flue were intact and there was no other damage it might be possible to secure the chimney against movement. A good wind could blow this chimney down. Watch out: don't try this at home and certainly not when there are people below, or when the flue is in use or probably any other time. Pushing gently on a tall flue like this should not produce easy movement. When we leaned on it a bit while climbing onto this roof. The chimney in our photo (above left) rocked and nearly fell over Loose wobbly masonry chimneys may be missing both lateral support (ties to the building wall) and rooftop support (Carson Dunlop's sketch, below right). When these supports are missing, even a chimney set on a solid foundation may tip, wobble, or separate from the building it serves. Lateral support may be required to tie a chimney to the building structure. Bracing Requirements for Masonry Chimneysīracing may be required for chimneys that extend high above the roof line. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. ![]() ![]() How do we strengthen tall or wobbly masonry chimneys? This article describes when and how support is added to tall masonry flues along the building exterior wall or above the roof-line. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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