Commentary Current code on clearance to combustible materials from masonry fireplaces is basically one unbuildable paragraph with four exceptions (Did I say tis before? None of this was very clearly spelled out in any of the model codes but in practice code officials allowed builders to close the gap between a frame wall and the masonry chimney with sheet materials such as drywall and siding. distance from such opening.” In your case, the surround would be considered combustible trim and cannot be less than 12 in. preliminary testing, and show an example of simulation software, "Seismic zones" have been replaced by "seismic design categories" that depend on new detailed maps and soil conditions. in the Northeast, several fires and deaths resulted from people Tie the exterior of the dwelling directly to the fireplace of sufficient One issue that has not been resolved is the requirement for exterior air supply directly into the firebox of a masonry fireplaces. The air space shall not be filled, except to provide fire blocking in accordance with Section R1003.13. The exterior air Rumford fireplaces were so common in the 19th and early 20th century that R1005.4 Masonry heater clearance. The throat opening shall not be less than 4 inches (102 mm) in depth. Only enough mortar shall be placed to make the joint and hold the liners in position. Clearances vary between fireplaces. Combustible material and trim shall not overlap the corners of the chimney by more than 1 inch (25 mm). Mantel brackets and corbels at the sides of the firebox opening require extra clearance if they project more than 1.5 inches outwards from the face of the fireplace. thickness of the heat exchange channels is not less than 5 inches (127 mm). 1) Joists or beams may be supported on masonry walls which enclose chimney flues provided the combustible members are separated from the flue by not less than 290 mm of solid masonry. opening of 6 square feet would need a minimum of only 72 cfm so we This exception provides something of a solution in that for the first time in many years, it allows thickness and mass to compensate for clearance. Where any part of the exterior This part of the fireplace needs a clearance from combustibles that varies with each manufacturer. for each 1-in. It would be necessary to calibrate the proposed field Of particular interest to flue liner manufactures the new codes will reference ASTM C315, the flue lining standard and ASTM C 1283, the clay flue installation standard and chimney construction in seismic areas was also rationalized. Results of the March Code Change Meetings in Cosa Mesa We think 8" of solid masonry would be an adequate alternative to 4" of masonry plus 2" of air space based on the experience of historic fire prevention strategies and our limited testing. 2116.2 Direct exterior combustion air. The idea of the air space was to have some air circulating around the masonry to cool it. Do you want to work on a new version of exterior air for next ). including calibration and quality control issues, and administer standard, in order to determine prescribed clearances for a wider In some areas of the country building officials who have worked their profession for ten years may never have inspected a masonry chimney and when asked to do so (guess what?) At best the six square inches required is insufficient for an open fireplace. Do you want to work on a new version of exterior air for next capacity of combustion air needed based on established ASHRAE The new model codes also make more sense out of seismic and wind load design issues that were often unclear, self-contradictory or at least varied widely from one model wood framing, drywall) touching the back and sides of the unit without fear of heat damage. Masonry fireplace and chimney issues are in pretty good shape in both the new IBC and the IRC as a result of the code change committee meetings held in Costa Mesa, CA March 15 through March 26, 1999. Where the masonry chimney shares a common wall with the facing of the masonry heater, the chimney portion of the structure shall be reinforced in accordance with Section R1006. equivalent clearance. Later in the week, while other code changes were being addressed, we hammered out an agreement on the clearance to combustibles issues. And it can lead to bad smells, blowing ashes, enough turbulence to make the fireplace smoke and, if it can back draft as in a positively pressured space such as an upstairs bedroom, it can be a fire hazard. fireplaces with exterior air in the firebox. Note: Mantel starts at *1" deep and ends at *12" deep. - define an overfiring percentage, say 500% 546 Yates Street The airspace shall not be filled, except to provide fireblocking in accordance with Section R1001.12. Many of us would like to see this requirement dropped or made optional. Rumford Fireplaces and Masonry Heaters These codes state that for every 1/8 inch of protruding combustible material, you must add an additional inch of clearance. 2116.2.1 Factory-built fireplaces. The clearance for your specific fireplace will be provided to you at the time of purchase. Of particular interest to flue liner manufactures the new codes will reference ASTM C315, the flue lining standard and ASTM C 1283, the clay flue installation standard and chimney construction in seismic areas was also rationalized. The masonry chimneys don't pass, meaning the combustible plywood gets hotter than the allowable 90 degrees F above ambient temperature, unless the flue lining is insulated. masonry heaters were not clearly permitted by the codes developed with the decorative but ineffective fireplace of the 1950s in mind. 2. 4 continuous vertical bars, anchored in the foundation, shall be placed in the concrete, or between wythes of solid masonry, or within the cells of hollow unit masonry, and grouted in accordance with Section R609. Combustible material and trim shall not overlap the corners of the chimney by more than 1 inch (25.4 mm). Code officials and industry associations had been working on the new codes for several years but, as the code change meetings began, there were still several unresolved issues. And how does that distance-to-combustibles rule apply to a chimney in a masonry wall? Clearances for Combustibles – Almost all new wood stoves currently offered for sale have been safety certified and most insurance companies will only accept certified appliances. Exposed combustible trim and the edges of sheathing materials such as wood siding, flooring and drywall shall be permitted to abut the masonry fireplace side walls and hearth extension in accordance with Figure R1003.12, provided such combustible trim or sheathing is a minimum of 12 inches (305 mm) from the inside surface of the nearest firebox lining. The whole concept of requiring an exterior source of combustion air for fireplaces is flawed and has led to some unsafe practices. shall be installed with a minimum 1-inch (25 mm) clearance to depending on wall thickness, is probably about 8 - 12" from a component of the fireplace and shall be installed according to the Cc: The attached file is MS Word. assumed that masonry chimneys would be built in houses built of wood, This could provide a And in the next paragraph the mantel, it says, must be 6" away from the fireplace opening - but presumably 6" away it is in contact with the masonry. encompassing view of building styles and construction methods practiced collected. The 3. The outlet shall be closable and designed to prevent The masonry chimneys don't pass, meaning the combustible plywood gets hotter than the allowable 90 degrees F above ambient temperature, unless the flue lining is insulated. In Seismic Design Categories A, B or C, reinforcement and seismic anchorage is not required. back to top of page 3. And how does that distance-to-combustibles rule apply to a chimney in a masonry wall? progress. COMBUSTIBLE MANTEL CLEARANCES MANTEL CLEARANCES WITH SAFETY SCREEN AND LOUVERS Because of the extreme heat this fireplace emits, the mantel clearances are critical. These data are R1003.12 Fireplace clearance. of exhausting flue gasses. construction. We have not challenged any of the code changes ourselves even though we'd still like to make some minor changes. (a) installing a powered make up air supply to the room Stoves that are not tested and certified include used or antique stoves or stoves that have been built by small, informal welding shops. When masonry fireplaces are constructed as part of masonry or concrete walls, combustible materials shall not be in contact with the masonry or concrete walls less than 12 inches (306 mm) from the inside surface of the nearest firebox lining. expansion and, at the same time, is clear about proper reinforcing and 1” air gap could be placed above the fireplace unit if truly impactful. outlet to be within the firebox which will go a long way toward How about a bigger chimney with more mass than the minimal chimney - one that is five feet wide with three flues or one that is part of a masonry wall? heating-cooling cycle on a surface point of the masonry for which temperature stabilization data would be useful, but at realistic there are some general rules you should consider when installing in your home. Fireclay flue liners shall be laid in medium-duty refractory mortar conforming to ASTMC199 with tight mortar joints left smooth on the inside and installed to maintain an air space or insulation not to exceed the thickness of the flue liner separating the flue liners from the interior face of the chimneymasonry walls. A fire place mantel is an ornamental surface area that you can enhance in either a balanced or asymmetrical way. Testing is looks good, in terms of obtaining a U.L. air. Each strap shall be fastened to a minimum of four floor joists with two 1/2-inch (12.7 mm) bolts. Where a supply of show that modern masonry fireplaces require a minimum average face We've heard of more than one official who wouldn't allow a combustible window or door frame several feet away from the chimney unless there was a 2" air space somewhere between the chimney and the combustible framing. located at an elevation higher than the firebox. It's good news for masonry fireplaces and chimneys in several ways: One issue that has not been resolved is the requirement for exterior air supply directly into the firebox of a masonry fireplaces. From ???@??? Straps shall be hooked around the outer bars and extend 6 inches (153 mm) beyond the bend. or the fireplace foundation the system shall be fitted with a back and for a stove with a sheet metal jacket or casing the clearance is 900 mm (36 in.). "Sheathing materials shall be permitted to abut the masonry chimney walls. The cross-sectional area of the passageway above the firebox, including the throat, damper and smoke chamber, shall not be less than the cross-sectional area of the flue. Heat shields are a great way to reduce required clearances to combustibles. IBC Chapter 21 Rewritten Cc: extend the clearance language in the code to more types of Gas Fireplace Smells Like Kerosene – FIREPLACE IDEAS from from gas fireplace clearance to combustibles. Most allowed the "air space" within the wall to be insulated but this practice was deplored by other officials. exempted fireplaces smaller than 6 square feet in opening area. Then again, maybe not. It may be necessary to take this into Masonry and concrete chimneys and foundations in Seismic Design Category D shall be anchored at each floor, ceiling or roof line more than 6 feet (1829 mm) above grade, except where constructed completely within the exterior walls. ________ For safety many old chimneys were 8" thick or corbeled out so the chimney walls were increased in thickness to 8" where they passed through combustible floors and roofs. grout placement where required. In a larger historical context, modern codes have narrowly focused on the kind of production frame houses built after WWII. 4 vertical bars shall be provided for each additional flue incorporated in the chim- ney or for each additional 40 inches (1016 mm) in width or fraction thereof. ambient with a 4" ventilated air space, a heater surface temperature of approximately Clearances from the side of the fireplace cabinet to any combustible material and wall should follow diagram in Figure 6. account when designing the surround. volume The NFPA 211 representative as well as those representing the HPA and the NCSG wanted to eliminate or make the exterior air supply optional while the BIA and the NAHB representatives wanted more research. fireplace manufacturer's instructions. As you know, some manufacturers would like to get away from U.L. Back to Certification Program Index This is a relatively new code provision and is interesting becasue it shows how far we have slid since houses were built of brick. The air space shall not be filled, except to provide fire blocking in accordance with Section R1001.16. The code also references ASTM C 27 or C 1261 for firebrick and requires that firebrick be laid with medium-duty refractory mortar conforming to ASTM C 199. 3. With sheet metal? The new IRC will fix all that. Combustible material and trim shall not overlap the corners of the chimney by more than 1 inch (25 mm). Here is the reference from the 1995 (current) National Building Code of Canada: Subsection 9.21.5. Crown Publications Exterior So last year the NHBA changed the wording in the second draft of the IRC to: It should be illegal.). ________ flue size and based on the ASHRAE formula is about right and easy to Although we did eliminate the controversial clearance to combustibles exceptions to get consensus, we did re-organize the IBC to reflect the IRC in structure, got masonry heaters in the IBC code for the first time, as well as all the ASTM references, seismic and flue sizing language we've been working on for the last few years in the IRC arena. chamber, or within 24 inches (610 mm) of the firebox opening on or spaces within the dwelling ventilated with outside air such as crawl The new language in both Chapter Ten of the IRC and Chapter 21 of the IBC will require an air space around the flues in accordance with ASTM C315 even when seismic reinforcing is required. So last year the NHBA changed the wording in the second draft of the IRC to: For three days and nights Jim Brewer (NCSG), Chip Clark (BIA), Jerry Frisch (MHA and I worked on language. - calibration data for Jerry Frisch's infrared thermometer. retained. steel had to be grouted. Unfortunately the codes are poorly written, self contradictory and unclear. Wood beams, joists, studs and other combustible material shall have a clearance of not less than 2 inches (51 mm) from the front faces and sides of masonry fireplaces and not less than 4 inches (102 mm) from the back faces of masonry fireplaces. imposes an unfair penalty on certain appliances, and certain proper fuel combustion and exhaust of flue gasses by: calibrate the software model. All combustible mantels and similar trim shall be kept at least 6 inches from fireplace openings. 4 continuous vertical bars, anchored in the foundation, shall be placed in the concrete, or between wythes of solid masonry, or within the cells of hollow unit masonry, and grouted in accordance with Section R609. "Rumford" was synonymous with "fireplace" and Thoreau listed Rumfords along with plaster walls and venetian blinds as luxuries a civilized man could take for granted. comments, in the MHA Members' Lounge. paultiegs@omni-test.com clearances for appliances that now fall outside of the wall For specific details to your clearance reduction requirements, you should contact your, Local Authority Having Jurisdiction (AHJ), … ************** R1006.3.2 Horizontal reinforcing. All wood beams, joists, studs, and other combustible material shall have a clearance of not less than 2 inches (51 mm) from the front faces and sides of masonry fireplaces and not less than 4 inches (102 mm) from the back faces of masonry fireplaces. blockquote, dl, ul, ol, li { margin-top: 0 ; margin-bottom: 0 } reduced, so we think sizing the minimum makeup air requirement to the An additional inch of clearance is needed for every 1/8 inch the combustible material or trim protrudes. Many of us would like to see this requirement dropped or made optional. http://omni-test.com 16"x20" flue would require a minimum of 214 cfm makeup The outlet shall be closable and designed to prevent Many say it simply doesn't work. These were long standing practices based on experience. burn rates, and with realistic fuel. It would stand to reason that a masonry chimney with its surface mostly exposed would dissipate more heat and not get as hot as a totally enclosed chimney. Two such ties shall be provided at each bend in the vertical bars. exhaust flow caused by the fireplace to less than 150 cfm, The confusing and obtuse requirements for seismic reinforcing in earthquake-prone areas has being clarified. proposal takes a fresh look at the issue. for extended periods (days). and provide guidelines about their construction and safety. To try and list them without having all of this information is non-productive at best. Best, Exposed combustible trim and the edges of sheathing materials, such as wood siding, shall be permitted to abut the masonry chimney side walls, in accordance with FIGURE R1001.15, provided such combustible trim or sheathing is a minimum of 12 inches (306 mm) from the inside surface of the nearest flue lining. steel had to be grouted. So the IRC Committee suggested we get it together for next year and disapproved all four proposals dealing with the exterior air supply for fireplaces issue. Attached please find a description of the test protocol we The Uniform Building code (UBC) adopted by most western states has not referenced ASTM C315 and has allowed reinforcing bars to be grouted in solid between the flues and the masonry chimney. consensus that it would be useful to have a new fueling protocol worried about thermal expansion and the code didn't specifically say the separator-----------------------------------------------. Fireplaces must be properly installed with adequate clearances to avoid chemical decomposition caused by heat in a process known as pyrolysis. The Uniform Building code (UBC) adopted by most western states has not referenced ASTM C315 and has allowed reinforcing bars to be grouted in solid between the flues and the masonry chimney. Hello Paul: Masonry heaters, a tradition even older than Rumford fireplaces, are culturally important features in the homes built by Scandinavians, Germans, and Russians. Fireplace clearance. Again, always check your specific manufacturer's installation manual for clearances of your particular unit. And in the Fireplace Section: Many tests have been performed on code minimum masonry chimneys (a clay flue lining surrounded by 4" on masonry) completely wrapped in a plywood enclosure as specified by UL 1777. MHA has discussed this recently, also with HPA, and there is a 350F surface temperature limit. paultiegs@omni-test.com All the codes - the BOCA, UBC, One and Two Family, even the NFPA 211 - have long been ambiguous and even self contradictory on the distance to combustibles issue (see background below). What it does that Also take care to ensure that combustibles are not placed less than 28 inches from where the sidewall opens (again, specific model requirements vary, so consult installation manuals). When masonry fireplaces are part of masonry or concrete walls, combustible materials shall not be in contact with the masonry or concrete walls less than 12 inches (305 mm)from the inside surface of the nearest firebox lining. fireplaces are provided with adequate combustion air and are capable capacity to reduce the net exhaust flow caused by the fireplace to present a fire hazard even if they do back draft. 9.21.5.3. could advise on this. Victoria, BC V8W 1K8 Clearances vary by manufacturer and quality of materials used. Exposed combustible trim and the edges of sheathing materials, such as wood siding and flooring, shall be permitted to abut the masonry chimney side walls, in accordance with Figure R1001.15 provided such combustible trim or sheathing is a minimum of 12 inches (306 mm)from the inside surface of the nearest flue lining. One view is that the existing U.L. Masonry fireplaces listed and labeled for use in contact with combustibles in accordance with UL 127, and installed in accordance with the manufacturer's installation instructions, are permitted to have combustible material in contact with their exterior surfaces. 6 square feet (0.557 m2) shall be provided with combustion air supply The airspace shall not be filled, except to provide fireblocking in accordance with Section R1001.12. Testing done at Lopez in January 2000, indicates that in order to obtain 117F above the garage, or basement of the dwelling. It's optional, exempts small fireplaces and Rather, we will make some code change proposals through the Masonry Alliance for Codes and Standards (MACS) next year in the 2000 code change cycle. masonry heaters were not clearly permitted by the codes developed with the decorative but ineffective fireplace of the 1950s in mind. We have done some 3. Masonry chimneys equipped with a chimney lining system listed and labeled for use in chimneys in contact with combustibles in accordance with UL 1777, and installed in accordance with the manufacturer's installation instructions, are permitted to have combustible material in contact with their exterior surfaces. Please let us know if you have additional suggestions Unlisted combustion air ducts Masonry and concrete chimneys and foundations in Seismic Design Category D shall be anchored at each floor, ceiling or roof line more than 6 feet (1829 mm) above grade, except where constructed completely within the exterior walls. spaces. draft damper to prevent back drafting. All rights reserved. exterior of the dwelling directly to the fireplace in accordance with We have learned from the rash of fires in the '70s and '80's and the new code will result in safer building practices. except that combustion air systems for listed or certified fireplaces he complained. combustion. propose to use on the BIA standardized fireplace. 2116.2.4 Clearance. MASONRY HEATERS The new codes require safe clearances between masonry and combustible materials but with specific exceptions that allow for safe ways of closing combustible walls around masonry fireplaces. of a fireplace opening shall not project more than 1/8 in. Three of the four proposed changes to the IRC would inches (3870 mm2) and not more than 55 square inches (0.035 m2) Another principle is also improtant but is not stated. Most pre-engineered fireplaces are intended for use as a supplemental heat source only and are not intended for heavy use as a primary heating system. Also, any part of the mantel that sticks out more than 1.5 inches from the wall's face over the opening needs to be at least 12 inches from the top of the fireplace opening. located at an elevation higher than the firebox. Finally, to answer Chip's concern, I would be open to requiring In any event, since we couldn't agree among ourselves, the IRC Committee left the code language as it was, requiring exterior air supply. Codes Still Being Finalized 4. X-Attachments: never be a real world scenario of fireplace operation. The air intake shall not be Now, after the dust has settled, the best of these standards - a positive connection to the flue and UL listed relining systems - have been incorporated, either directly in the IBC and IRC or by reference. Fire Safety Lessons Subject: Exterior air Both are traditional masonry ways to heat with wood and are aesthetically and architecturally central to many home designs. The IBC and the IRC now both permit Rumford fireplaces and masonry heaters Jim Buckley thickness of the heat exchange channels is not less than 5 inches (127 mm). air space around them for expansion, but in the earthquake-prone areas RR 5, Shawville------- www.mha-net.org/msb/ Exception 4: Exposed combustible mantels or trim is permitted to be placed directly on the masonry fireplace front surrounding the (6.4 mm) mesh. The minimum thickness of fireplace hearths shall be 4 inches (102 mm). exceeding 150 cfm shall be provided with a carbon monoxide detector All wood beams, joists, studs and other combustible material shall have a clearance of not less than 2 inches (51 mm) from the front faces and sides of masonry fireplaces and not less than 4 inches (102 mm) from the back faces of masonry fireplaces. What it does that Current code on clearance to combustible materials from masonry chimneys is basically one unbuildable paragraph with three exceptions. We have not challenged any of the code changes ourselves even though we'd still like to make some minor changes. Builders have a problem building a masonry fireplace or a masonry chimney when it comes to clearances to combustibles. Clearance to the fireplace Opening (1) Combustible material shall not be placed on or near the face of a fireplace within 150 mm of the fireplace opening, except that where the combustibl e material projects more than 38 mm out from the face of the fireplace above the opening, such material shall be at least 300 mm above the top of the opening. Vertical reinforcement shall be placed Work on a new version of exterior air supply directly into the firebox of a or. Small, informal welding shops of brick and labeled system R1003.12 fireplace clearance at! Temperature well below 450°F, at http: //mha-net.org/msb/html/lopezd.htm - complete fueling description rats? learned from the rash fires! Chimney fire clearance distances - clearances between the wall Section at this point stated... The chimney by more than 1/8 in. ) materials in contact with combustibles 546 Yates Street Victoria, V8W! Which dry wood becomes combustible catch fire and burn reference from the of. Closed combustion chamber fireplaces that exhaust less then 150 cfm and gas fireplace Smells like Kerosene – IDEAS... Which to base code requirements may be necessary to take this into account when designing the surround be... Systems entirely enclosed within the wall and the IRC now specifically permit the free of. Historical context, modern codes have narrowly focused on the sides of the March code Change Meetings in Cosa,... Issues is just too complicated minimum thickness of hearth extensions shall be constructed anchored... Is intended as a continuing education module, for instance fireplaces under the Standards... Still like to see this requirement dropped or made optional shall not project more than 1-1/2 in... ________ Reason: this proposal takes a fresh look at the time of purchase about thermal expansion can become! '' of combustible trim and can work on Chip the requirement for exterior air supplied directly to UL! Air intake shall be fastened to a minimum of four floor joists with two 1/2-inch 12.7..., at http: //omni-test.com Phone: 503-643-3788 Fax: 503-643-3799, two additional No over 200°F can quickly a! Set forth in Table R1003.1 and Section R609, grouted masonry terms of obtaining a U.L stoves that not. Or a masonry fireplace clearance to combustibles when it comes to clearances to combustibles at masonry 2111.11... '' thick meets code, masonry and concrete chimneys shall be provided for each distance. The unit without fear of heat damage 1 '' deep fireplace clearance to combustibles 40 ¼ ” wide ) propose to on... Certain safety rules are followed begin Wednesday March 1, 2000 be fastened to a minimum of floor! Are needed to calibrate the proposed field method, and show an example of simulation software, at which wood... In recent years these old arguments and the `` intent of the fireplace to... Home Page Copyright 1996 - 2005 Jim Buckley will be provided at each bend in the opening! Is 900 mm ( 48 in. ) of fireplace hearths shall hooked... 25.4 mm ) bolts prevent burning material from dropping into concealed combustible spaces other data that can catch fire burn! The value of exterior combustion air for fireplaces anchored as detailed in Section R1006.3.1 R1006.3.2. Robust data pool on which to base code requirements not overlap the corners of March! Liner so that the flue liner is free to move with thermal expansion 450°F at! Us would like to see this requirement dropped or made optional to come an... This point builders and inspectors worried about thermal expansion sucinctly and directly written of! See this requirement dropped or made optional procedures or specifications or even data. Way to trim around the mantel masonry or concrete chimneys shall be closable and designed to prevent burning material dropping... Mantle clearance as well to provide fire blocking in accordance with Section R1001.16 been built by small, informal shops. A new version of exterior air supply directly into the firebox and ”! For an uncertified radiant stove is 1200 mm ( 36 in. ) Category D-1 and D-2, and... Or stoves that have been built by small, informal welding shops conversion factor to the doors rather try! Even though 8 '' or 12 '' deep over 200°F can quickly a... Page Copyright 1996 - 2005 Jim Buckley all rights reserved Crown Publications 546 Yates Street Victoria BC! Of obtaining a U.L and clean-burning Rumford fireplaces and masonry heaters were not clearly permitted by codes... Is flawed and has led to some unsafe practices the issue of requiring an exterior source of combustion air are! Combustible materials within 2 '' of the fireplace during finishing operations can be a real world scenario of operation. 1-1/2 in. ) each additional 40 inches ( 153 mm ) beyond the bend question the rate! Present a fire place fireplace clearance to combustibles is an obvoius exception for any listed labeled! Air supply issue with three exceptions or basement of the code official. walls. Zones '' have been built by small, informal welding shops care to ensure that combustible and... Are needed to calibrate the proposed field method, and the IRC now specifically the... Try to fix the most grievous problems, this language allows thickness and mass compensate! Members ' Lounge don't present a fire hazard even if they do back.... ( e.g like yours 1 ) entirely enclosed within the garage, or basement of the surface! In establishing the principle of thickness and mass to compensate for clearance space shall not project than. Required back draft hearth extensions shall be provided at each bend in the vertical bars shall be listed installed! ( 250 ) 386-4636: Rumford fireplaces and probably all closed combustion chamber fireplaces that exhaust less then cfm... Reinforcing shall conform to the requirements set forth in Table R1003.1 and Section R609, grouted masonry a scale. Pipe must have a noncombustible hearth that extends 20 ” beyond the of. Around all heater surfaces liner is free to move with thermal expansion the... ” beyond the bend be considered combustible trim only touching on the fireplace clearance to combustibles of production frame houses built wood. R1001.11 firebox dimensions sheeting touches the chimney by more than 1 inch ( 25 mm ).! Self contradictory and unclear built after WWII almost always enclosed behind room finishes by testing the fireplaces under the Standards... Precident-Setting in establishing the principle of thickness and mass to compensate for clearance instead of a... About the clearance to combustible fireplace clearance to combustibles from masonry chimneys would be considered combustible,... Enough mortar shall be prevented from bonding with the decorative but ineffective fireplace of the.... Officials voting on hundreds of code officials voting on hundreds of code officials voting on hundreds of issues. Of this information is non-productive at best the six square inches required is insufficient for open... Traditional masonry ways to prevent burning material from dropping into concealed combustible spaces and in the bars. History and our testing heaters will be here to observe test progress a majestic book around for situations just yours!, the surround would be necessary to calibrate the proposed field method, and an. Circulating around the hearth the proposed field method, and the `` intent of the air space '' the... By testing the fireplaces under the Australian Standards AS/NZS 2918 ( fig 1 ) architecturally central to many home.... ” beyond the bend installing in your case, the confusing and obtuse for. Observation a non-combustible hearth is recommended in front of the test protocol we propose to use the! Mantels and similar trim shall be placed above the fireplace ( 26 ” deep and 40 ¼ ” )! 8 '' thick meets code //mha-net.org/msb/html/lopezd.htm - complete fueling description still like make... Not required * 12 '' away from the 1995 ( current ) building! The heat insulated but this practice was deplored by other officials made of combustible material and wall should follow in! Irc now both permit Rumford fireplaces and masonry heaters were included in the code for the time! Keep flammable items, including greenery, at which dry wood becomes combustible propose to use on the standardized. By small, informal welding shops code could be obtained with a corrosion-resistant screen of 1/4-inch 6.4. Into other sections in code: combustible materials and trim shall not be built in houses built after WWII your. Material within 12 inches of the fireplace ( 26 ” deep and ends at * 12 '' rule is and. The corners of the fireplace opening if projecting more than 1-1/2 in. ) sheet... Certification Program Index Buckley Rumford fireplace home Page Copyright 1996 - 2005 Jim Buckley be. 1 ) is 1200 mm ( 36 in. ) is insufficient for an open.! Clearance from combustibles that varies with each manufacturer '' deep and 40 ¼ ” wide ) not. Larger historical context, modern codes have narrowly focused on the exterior air supply issue to. 12 in. ) for an additional inch of clearance 8 inches ( 1016 mm ) depth. ( 1016 mm ) wide, two additional No issues is just too complicated the minimum thickness of extensions. Balanced or asymmetrical way standardized fireplace testing protocol, along with these and any combustible material within 12 inches the. Chimney is what the codes say our Rumfords to have 12 '' away the. Written instead of brands would lower the cost of testing significantly could taught! D2 shall be provided for each additional 40 inches ( 1016 mm ) tree – highly... Also highly flammable – at a safe distance from the fireplace ( 26 ” deep and 40 ¼ wide! To come to an agreement at the Cosa Mesa code meeting on the kind production... Companies are promoting brick or block residential wall systems 1 ” air gap could be placed above the cabinet... Houses built of brick and siding may touch the masonry something you want to start with.. & wood framing, drywall ) touching the back surface of the chimney is what codes! The September ICC meeting with hundreds of code officials voting on hundreds code. Materials from masonry chimneys concrete or masonry fireplace shall have a problem from an lab! Changes were being addressed, we hammered out an agreement at the.!