Inaccessible Chimney Flue at Fireplace Inserts
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Inaccessible or blocked-off fireplace & chimney inspection:
Inaccessible chimneys & flues: this article describes the blocking of ready access to an existing fireplace and chimney flue when a "zero clearance" or other woodstove or heating appliance is inserted into a fireplace. Because the condition of an inaccessible flue is unknown, and because possibly dangerous fire or carbon monoxide hazards could be present, we offer advice on further inspection and cleaning.
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Inaccessible Connections Between Fireplace or Woodstove Insert & the Chimney Flue
These articles on chimneys and chimney safety provide detailed suggestions describing how to perform a thorough visual inspection of chimneys for safety and other defects.
Chimney inspection methods and chimney repair methods are also discussed.
[Click to enlarge any image]
Carson Dunlop Associates [at REVIEWERS] sketch explains that a home inspector is not required to inspect the connections between a fireplace insert (such as a woodstove or coal stove inserted into a fireplace) and the chimney. Our page top sketch of a typical fireplace insert is also provided courtesy of Carson Dunlop Associates & Associates.
In fact it is just about impossible to see the condition of these components and their connections unless the insert is removed or inspected from above using a chimney inspection camera system.
If a woodstove/free-standing fireplace like this were to be used it would probably require at least three feet of clearance from combustibles.
Local codes and fire regulations need to be consulted, and in most jurisdictions, a building permit and safety inspection are required for the installation of a woodstove or similar device.
See WOOD STOVE OPERATION & SAFETY for important details and also
see CHIMNEY SAFETY ALERT for Wood Burning Appliances - US CPSC Alert Document 5017, wood stoves, fireplace. More help with inspecting chimney flue interiors can be found in the articles listed below.
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Continue reading at CHIMNEY FLUE INSPECTION CAMERA or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see these
Recommended Articles
- CHIMNEY INSPECTION, FLUE INTERIOR
- CHIMNEY INSPECTION DIAGNOSIS REPAIR
- FIREPLACE INSERTS INSTALL, INSPECT, REPAIR
Suggested citation for this web page
INACCESSIBLE CONNECTIONS FIREPLACE, WOODSTOVE at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
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INDEX to RELATED ARTICLES: ARTICLE INDEX to CHIMNEYS & FLUES
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Citations & References
In addition to any citations in the article above, a full list is available on request.
- Mark Cramer Inspection Services Mark Cramer, Tampa Florida, Mr. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. Mr. Cramer serves on the ASHI Home Inspection Standards. Contact Mark Cramer at: 727-595-4211 mark@BestTampaInspector.com
- John Cranor [Website: /www.house-whisperer.com ] is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. He is also a contributor to InspectApedia.com in several technical areas such as plumbing and appliances (dryer vents). Contact Mr. Cranor at 804-873-8534 or by Email: johncranor@verizon.net
- NFPA 211: Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances, (2024) at the NFPA Bookstore, (Older NFPA editions and standards are found at the same bookstore)
- NFPA #211-3.1 1988 - Specific to chimneys, fireplaces, vents and solid fuel burning appliances.
- NFPA # 54-7.1 1992 - Specific to venting of equipment with fan-assisted combustion systems.
- GAMA, VENTING TABLES, CATGORY I CENTRAL FURNACES [PDF] (1990 & 2000) Gas Appliance Manufacturers' Association,, includes also fan-assisted combustion system central furnaces.
SPECIAL METAL-FAB UPDATE AS OF MARCH 2000 The venting tables within this booklet have now been included in the National Fuel Gas Code (NFPA 54/ANSI Z223.1-1999). That code may also be used to size venting systems for drafthood equipped central furnaces or for fan-assisted combustion system central furnaces.
This booklet contains new venting tables designed specifically for use with Category I central furnaces.
These tables are unique, in that, industry wide venting tables now exist for fan-assisted combustion system central furnaces. Venting tables for these types of appliances are not contained in the National Fuel Gas Code (NFPA 54/ANSI Z223.1-1988).
All requirements contained in this booklet apply to both Category I drafthood equipped central furnaces as well as fan-assisted combustion system central furnaces. At no time should a venting system for a listed Category II, III, or IV central furnace be sized with these tables.
The National Fuel Gas Code (NFPA 54/ANSI Z223.1-1988) may also be used to size venting systems for drafthood equipped central furnaces.
However, at this time, the National Fuel Gas Code does not include alternate sizing methods for fan-assisted combustion systems.
Therefore, until engineering data is developed to allow alternate sizing methods for Category I fanassisted central furnaces, the enclosed venting tables must be used for fan-assisted combustion system central furnaces.
These tables apply to venting single appliances and common venting multiple appliances in both metal and masonry chimneys. - National Fuel Gas Code, an American National Standard, 4th ed. 1988 (newer edition is available) Secretariats, American Gas Association (AGA), 1515 Wilson Blvd., Arlington VA22209, and National Fire Protection Association (NFPA), Batterymarch Park, Quincy MA 02269. ANSI Z223.1-1988 - NFPA 54-1988. WARNING: be sure to check clearances and other safety guidelines in the latest edition of these standards.
- ICC, Fire Inspector Guide Based on the 2021 International Fire Code [ICC Digital Subscription] International Code Council
- Uniform Mechanical Code - UMC 1991, Sec 913 (a.) Masonry Chimneys, refers to Chapters 23, 29, and 37 of the Building Code.
- New York 1984 Uniform Fire Prevention and Building Code, Article 10, Heating, Ventilating, and Air Conditioning Requirements
- New York 1979 Uniform Fire Prevention & Building Code, The "requirement" for 8" of solid masonry OR for use of a flue liner was listed in the One and Two Family Dwelling Code for New York, in 1979, in Chapter 9, Chimneys and Fireplaces, New York 1979 Building and Fire Prevention Code:
- "Top Ten Chimney (and related) Problems Encountered by One Chimney Sweep," Hudson Valley ASHI education seminar, 3 January 2000, contributed by Bob Hansen, ASHI
- Chimney Inspection Checklist, Carson Dunlop, Associates, Toronto, Ontario
- Costello, Martine & Josh Kovner, "Rooftop View Turns to Darkness," New Haven Register, 12 May 1992 p. 11:
Excerpt:
Catherine Murphy was sunning on a building roof when a chimney collapsed; she fell into and was trapped inside the chimney until rescued by emergency workers. - "Chimneys and Vents," Mark J. Reinmiller, P.E., ASHI Technical Journal, Vol. 1 No. 2 July 1991 p. 34-38.
- "Chimney Inspection Procedures & Codes," Donald V. Cohen was to be published in the first volume of the 1994 ASHI Technical Journal by D. Friedman, then editor/publisher of that publication, but the production of the ASHI Technical Journal was cancelled by ASHI President Patrick Porzio.
Some of the content of Mr. Cohen's original submission has been included in this more complete chimney inspection article:
CHIMNEY INSPECTION DIAGNOSIS REPAIR - Natural Gas Weekly Update: http://tonto.eia.doe.gov/oog/info/ngw/ngupdate.asp Official Energy Statistics from the U.S. Government
- US Energy Administration: Electrical Energy Costs http://www.eia.doe.gov/fuelelectric.html
- NFPA 211 - 3-1.10 - Relining guide for chimneys
- NFPA 211 - 3-2 - Construction of Masonry Chimneys
- NFPA 211 - 3-3 - Termination Height for chimneys
- NFPA 211 - 3-4 - Clearance from Combustible Material
- NFPA 54 - 7-1 - Venting of Equipment into chimneys
- Brick Industry Association (Website) [Previously the Brick Institute of America] 12007 Sunrise Valley Drive Suite 430, Reston, VA 20191 USA, provides articles giveing details for Flashing Chimney, Proper Chimney Crown, and Moisture Resistance of Brick.
See the BIA Technical Notes Index [PDF] (BIA Website) for free downloads from the BIA's extensive library - American Gas Association - New Vent Sizing Tables
- Chimney Safety Institute of America - Chimney Fires: Causes, Effects, Evaluation
- National Chimney Sweep Guild [Website] 1255 SW Prairie Trail Pkwy Ankeny, Iowa 50023 USA, Tel: +1 (317) 837-1500 Email: office@ncsg.org NCSG certifies chimney sweep (cleaning) professionals.
- NFPA 211 - 3-1.10 - Relining guide for chimneys
- NFPA 211 - 3-2 - Construction of Masonry Chimneys
- NFPA 211 - 3-3 - Termination Height for chimneys
- NFPA 211 - 3-4 - Clearance from Combustible Material
- NFPA 54 - 7-1 - Venting of Equipment into chimneys
- Brick Industry Association (Website) [Previously the Brick Institute of America] 12007 Sunrise Valley Drive Suite 430, Reston, VA 20191 USA, provides articles giveing details for Flashing Chimney, Proper Chimney Crown, and Moisture Resistance of Brick.
See the BIA Technical Notes Index [PDF] (BIA Website) for free downloads from the BIA's extensive library - American Gas Association - New Vent Sizing Tables
- Chimney Safety Institute of America - Chimney Fires: Causes, Effects, Evaluation
- National Chimney Sweep Guild [Website] 1255 SW Prairie Trail Pkwy Ankeny, Iowa 50023 USA, Tel: +1 (317) 837-1500 Email: office@ncsg.org NCSG certifies chimney sweep (cleaning) professionals.
- In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
CONTINUE READING or RECOMMENDED ARTICLES.
- Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: info@carsondunlop.com. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The HOME REFERENCE BOOK - the Encyclopedia of Homes and to use illustrations from The ILLUSTRATED HOME .
Carson Dunlop Associates provides extensive home inspection education and report writing material. In gratitude we provide links to tsome Carson Dunlop Associates products and services.
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