Home Made or Site Built Chimney Rain Cap Features
Chimney top rain caps may be a DIY project. Are they safe?

POST a QUESTION or COMMENT about home made or DIY chimney rain caps & chimney caps & their inspection, installation, troubleshooting & repair or replacement.

Home made or DIY chimney rain caps & covers:

This article describes do-it-yoursel for "home-made chimney rain caps or top covers or rain covers. We explain why using an un-listed or DIY chimney rain cap may be unsafe, may violate building codes, or may not work well - or on the other hand maybe it will work. We'll take a look at several DIY chimney rain caps. At page top is an interesting home-made chimney top that may not provide adequate venting area.

This article series discusses common chimney cap & crown types, choices, & defects, and we cite pertinent chimney top cap / crown building codes & standards for fire and other safety concerns.

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

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Home Made & Site-Built Brick Chimney Rain Caps & Chimney Caps: Combination Designs

Large site-built chimney cap in Maine (C) Daniel Friedman

In our photo at above left, the interesting chimney has a metal rain cap on one flue and not the other. The metal chimney cap looks home-made and perhaps not functional. The un-covered chimney flue (and most likely the covered one) are comprised of hard-fired clay chimney flue tiles.

The presence of creosote tar and soot stains around the left-hand rain cap and the size of its base make us suspect that what was originally a fireplace flue was covered and possibly lined with a smaller-diameter metal flue serving a woodstove.

Watch out: without disassembly or an in-flue inspection we don't know if this chimney has been lined with a metal flue, insulated, safe, and proper, or not. Further clues will be found indoors, such as perhaps a woodstove or fireplace insert. Further in-flue inspection for chimney safety is needed.

A type "A" listed metal chimney cap properly matched to the chimey flue is, in our opinion, more likely to be safe, functional, and code-compliant than an expedient DIY chimney rain cap such as those show here.

Watch out: if a DIY chimney rain cap obstructs the chimnmey by not providing enough venting space or area, or if the home made rain cap lets water enter the chimney or chimney flue the result may be a damaged and unsafe chimney risking carbon monoxide hazards or a building fire.

At above right an impressively-large and apparently custom-made chimney rain cap is displayed on a condominium we examined in Maine. The actual net free opening area was not visible.

More Site-Built Chimney Caps

Above we illustrate a home made metal rain cap installed on what looks like an unlined flue on a home in Brooklyn, New York. There is no spark arrestor; if the installer used aluminum this rain cap may also be short lived. I'd want the chimney inspected by a certified chimney sweep.

At below left we illustrate a simple masonry chimney cap and rain cap constructed using thin soft clay bricks.

This combined rain cap and chimney cap and serve adequately to keep most rain out of the flue. Built originally for venting a small wood fire, this chimney rain cap are located in the temperate climate of central Mexico. You can see minor damage to the chimney's drip cap as the soft bricks are easily broken away.

Below our photo illustrates a combined chimney rain cap and chimney cap constructed of arch brickwork atop a New Hampshire home.

Like the A-shaped Mexican chimney rain cap (above left) this New Hampshire arched chimney rain cap offer some rain protection for the chimney flue and top surface but these designs:

do not provide a seal around the internal chimney flue
do not provide protection from downdrafts caused by winds that blow at right angles to the chimney rain cap shape and orientation
and the New Hampshire arched brick chimney cap does not provide a drip edge to protect the chimney sides from water and frost damage

...

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Citations & References

In addition to any citations in the article above, a full list is available on request.

[1] ...
[2] ...
[3] Wood Heating Alliance, "BUILDING INSPECTOR'S CHECKLIST FOR FACTORY BUILT FIREPLACES [PDF] ", appearing in Baird, David J., C.B.O., "Factory-built Chimney Chase Fires: A case for More Detailed Inspection", Building Standards, March-April 1991, pp. 14-17. Note: The Fireplace Institute (FI) and the Wood Energy Institute (WEI) united to form the Wood Heating Alliance in 1980. The name was then changed again in 1983 to the Hearth Products Association (HPA) a non-profit organization, in order to better reflect the diversity and range of products and services within the industry. The name was changed once more to, Hearth Patio and Barbecue Association (HPBA) in 2001. Pacific HPBA, 2304 Huntington Dr., Suite 218, San Marino, CA 91108 (626) 237-1200 or (888) 332-2472 Fax: (626) 237-0721- info@hpbapacific.org, Website: http://hpbapacific.org/
Fireplace Safety Tips - Barbecue Safety Tips from the HPBA - see http://hpbapacific.org/pdfs/safetytips.pdf
[4] Baird, David J., C.B.O., "Factory-built Chimney Chase Fires: A case for More Detailed Inspection", Building Standards, March-April 1991, pp. 14-17.

[5] Stephen Werner, General Manager, Chimney King LLC., P.O. Box 8, Gurnee, IL 60031, Tel: (847) 244-8860, Email: steve@chimneyking.com, Website: www.chimneyking.com . Mr. Werner is also a licensed home inspector serving clients in Wisconsin. Chimney King sells their products through a network of fireplace dealers, chimney sweeps, roofers and builders. Each decorative shroud is custom built because no two chimney/chase are alike.

Stephen Werner General Manager Chimney King, op cit, personal communication 3/26/2013 w/attachments:
- CHIMNEY KING INSTALLATION INSTRUCTIONS FOR CHIMNEY CROWN, [PDF]
- Purdie, Roger K., "CHIMNEY FIRE SAFETY BULLETIN", Vista Fire Protection District, 2001, report of house fire related to the home's metal chimney. Contains advice for chimney * fire safety & sketches of approved and not-code-approved metal chimney tops, caps & crowns. [PDF]
- See also CHIMNEY SHROUD FIRE - technical article contribution by Mr. Werner
[6] Residential Masonry Fireplace and Chimney Handbook, James E. Amrhein, S.E., MIA, Masonry Institute of America, 2d. Ed., 1995, ISBN 0-940116-29-4. The MIA is in Los Angeles, CA 213-388-0472. This manual reflects the 1994 Uniform Building Code, Energy Conservation Requirements of California, and the U.S. Department of Housing and Urban Development - HUD. The complete UBC is available from the International Conference of Building Officials (ICBO), Whittier CA 310-699-0541.
[7] 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)
[8] 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), NFPA #211-3.1 1988 - Specific to chimneys, fireplaces, vents and solid fuel burning appliances.
- 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
[9] NFPA # 54-7.1 1992 - Specific to venting of equipment with fan-assisted combustion systems.
[10] GAMA - Gas Appliance Manufacturers' Association has prepared venting tables for Category I draft hood equipped central furnaces as well as fan-assisted combustion system central furnaces.
[11] 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.
[12] Fire Inspector Guidebook, A Correlation of Fire Safety Requirements Contained in the 1987 BOCA National Codes, (newer edition available), Building Officials and Code Administrators International, Inc. (BOCA), Country Club HIlls, IL 60478 312-799-2300 4th ed. Note: this document is reissued every four years. Be sure to obtain the latest edition.
[13] Uniform Mechanical Code - UMC 1991, Sec 913 (a.) Masonry Chimneys, refers to Chapters 23, 29, and 37 of the Building Code.
[14] 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:
[15] "Top Ten Chimney (and related) Problems Encountered by One Chimney Sweep," Hudson Valley ASHI education seminar, 3 January 2000, contributed by Bob Hansen, ASHI
[16] Chimney Inspection Checklist, Carson Dunlop, Associates, Toronto, Ontario
[17] "Rooftop View Turns to Darkness," Martine Costello, Josh Kovner, New Haven Register, 12 May 1992 p. 11: 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.
[18] "Chimneys and Vents," Mark J. Reinmiller, P.E., ASHI Technical Journal, Vol. 1 No. 2 July 1991 p. 34-38.
[19] "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. The production of the ASHI Technical Journal and future editions 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 . Copies of earlier editions of the ASHI Technical Journal are available from ASHI, the American Society of Home Inspectors.
[20] Natural Gas Weekly Update: http://tonto.eia.doe.gov/oog/info/ngw/ngupdate.asp Official Energy Statistics from the U.S. Government
[21] US Energy Administration: Electrical Energy Costs http://www.eia.doe.gov/fuelelectric.html
[24] Ceramic Roofware, Hans Van Lemmen, Shire Library, 2008, ISBN-13: 978-0747805694 - Brick chimneys, chimney-pots and roof and ridge tiles have been a feature of the roofs of a wide range of buildings since the late Middle Ages. In the first instance this ceramic roofware was functional - to make the roof weatherproof and to provide an outlet for smoke - but it could also be very decorative. The practical and ornamental aspects of ceramic roofware can still be seen throughout Britain, particularly on buildings of the Victorian and Edwardian periods. Not only do these often have ornate chimneys and roof tiles but they may also feature ornamental sculptures or highly decorative gable ends. This book charts the history of ceramic roofware from the Middle Ages to the present day, highlighting both practical and decorative applications, and giving information about manufacturers and on the styles and techniques of production and decoration. Hans van Lemmen is an established author on the history of tiles and has lectured on the subject in Britain and elsewhere. He is founder member and presently publications editor of the British Tiles and Architectural Ceramics Society.
[25] Chimney Inspection Checklist, Carson Dunlop, Associates, Toronto, Ontario
[26] Chimney & Stack Inspection Guidelines, American Society of Civil Engineers, 2003 - These guidelines address the inspection of chimneys and stacks. Each guideline assists owners in determining what level of inspection is appropriate to a particular chimney and provides common criteria so that all parties involved have a clear understanding of the scope of the inspection and the end product required. Each chimney or stack is a unique structure, subject to both aggressive operating and natural environments, and degradation over time. Such degradation may be managed via a prudent inspection program followed by maintenance work on any equipment or structure determined to be in need of attention. Sample inspection report specifications, sample field inspection data forms, and an example of a developed plan of a concrete chimney are included in the guidelines. This book provides a valuable guidance tool for chimney and stack inspections and also offers a set of references for these particular inspections.
[27] Fireplaces, a Practical Design Guide, Jane Gitlin
[28] Fireplaces, Friend or Foe, Robert D. Mayo
[29] Principles of Home Inspection: Chimneys & Wood Heating, in (Principles of Home Inspection), Carson Dunlop, Associates, Toronto, Ontario
[30] U.S. vs. Canadian Unlined Masonry Chimney Flue Requirements & Case Study
[31] Brick Institute of America - Flashing Chimneys
Brick Institute of America - Proper Chimney Crowns
Brick Institute of America - Moisture Resistance of Brick
[32] American Gas Association - New Vent Sizing Tables
[33] Chimney Safety Institute of America - Chimney Fires: Causes, Effects, Evaluation
[34] National Chimney Sweep Guild - Yellow Pages of Suppliers
[35] "Building Codes that Regulate Decorative Chimney Shrouds", provided by Stephen Werner [5], [copy on file as Chimney_Decorative_Shroud_Regs.pdf] cites:
- International Mechanical Code IMC (2000), M74-98 806.6, ratified 9.98, model building code for the United States,
  806.6 Decorative Shrouds. Decorative shrouds shall not be installed at the termination of factory-built chimneys, except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with section 304.1. Reason: Decorative shrouds have been the cause of roof and chase fires
- International Residential Code (IRC) (2000), R1002.2 ratified 9/99, 1000.2 Decorative Shrouds. Decorative shrouds shall not be installed at the termination of factory-built chimneys, except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with the manufacturers installation instructions. Reason: Decorative shrouds often allow for the creation of temperatures in excess of those permitted in UL 103 and UL 127. Decorative shrouds have been the cause of chase top fires ...
- International Fire Code (IFC) (2000), IFC 603.6.3, 603.6.3 Decorative Shrouds. Decorative shrouds installed at the termination of factory-built chimneys shall be removed, except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with the manufacturers installation instructions. Reason: Decorative shrouds have been the cause of dozens of chase fires. As a non-listed part to a listed assembly, their use should not have been allowed in the first place.
[36] International Residential Code IRC R100.11 - Fireplace Clearance:
International Residential Code was recently amended:
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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Home Made or Site Built Chimney Rain Cap Features
Chimney top rain caps may be a DIY project. Are they safe?