2026 IRC Exam - Chapters 10, 11 - Chimneys
& Fireplaces, Energy Efficiency Questions
with Correct Answers
Footings for masonry fireplaces and their chimneys shall be at least ________ thick and shall extend not l
ess than ________ beyond the face of the fireplace or foundation wall on all sides. Footings shall extend
to below the frost line, if applicable. - correct answer-12"
6"
R1001.2 Footings and foundations.
Firebox depth shall not be less than _________. The throat shall not be less than ________ above the fir
eplace opening and shall not be less than ________ deep. - correct answer-20"
8"
4"
R1001.6 Firebox dimensions.
A masonry chimney shall not change size or shape for a minimum of ________ above or below where th
e chimney passes through the floor, ceiling, or roof components. - correct answer-6"
R1003.6 Changes in dimension.
A clay flue liner for a masonry chimney shall be carried vertically, with a maximum slope of _______ from
the vertical. - correct answer-30 degrees
R1003.12 Clay flue lining.
When two or more flues are located in the same masonry chimney, the adjacent flue linings shall be sepa
rated by masonry wythes having a minimum thickness of _________. - correct answer-4"
, R1003.13 Multiple flues.
Unless cleaning is possible through the fireplace opening, a cleanout opening shall be provided within __
______ of the base of a flue in a masonry chimney. - correct answer-6"
R1003.17 Masonry chimney cleanout openings.
What is the
minimumxrequiredxthicknessxofxthexbackxandxsidexwallsxofxaxmasonryxfire-
boxxconstructedxofxsolidxmasonryxwithoutxaxfirebrickxlining?x-xcorrectxanswer-10"
R1001.5xFireboxxwalls.
Wherexfirebricksxarexusedxasxliningxforxaxmasonryxfireplace,xthexmaximumxjointxspacingxshallxbex______
__
betweenxfirebricks.x-xcorrectxanswer-1/4"
R1001.5xFireboxxwalls.
Thexdamperxorxthroatxforxaxmasonryxfireplacexshallxbexlocatedxaxminimumxofx_______xabovexthexlintel
xsu
pportingxthexmasonryxoverxthexfireplacexopening.x-xcorrectxanswer-8"
R1001.7xLintelxandxthroat.
Minimumxrequiredxthicknessxforxthexhearthxofxaxmasonryxfireplacexshallxbex________.x-
x4correct
" xanswer-
R1001.9.1xHearth.
Woodxstudsxshallxhavexaxminimumxclearancexofx________fromxthexbackxfacexofxaxmasonryxfireplace
.x-
correctxanswer-4"
R1001.11xFireplacexclearance.
& Fireplaces, Energy Efficiency Questions
with Correct Answers
Footings for masonry fireplaces and their chimneys shall be at least ________ thick and shall extend not l
ess than ________ beyond the face of the fireplace or foundation wall on all sides. Footings shall extend
to below the frost line, if applicable. - correct answer-12"
6"
R1001.2 Footings and foundations.
Firebox depth shall not be less than _________. The throat shall not be less than ________ above the fir
eplace opening and shall not be less than ________ deep. - correct answer-20"
8"
4"
R1001.6 Firebox dimensions.
A masonry chimney shall not change size or shape for a minimum of ________ above or below where th
e chimney passes through the floor, ceiling, or roof components. - correct answer-6"
R1003.6 Changes in dimension.
A clay flue liner for a masonry chimney shall be carried vertically, with a maximum slope of _______ from
the vertical. - correct answer-30 degrees
R1003.12 Clay flue lining.
When two or more flues are located in the same masonry chimney, the adjacent flue linings shall be sepa
rated by masonry wythes having a minimum thickness of _________. - correct answer-4"
, R1003.13 Multiple flues.
Unless cleaning is possible through the fireplace opening, a cleanout opening shall be provided within __
______ of the base of a flue in a masonry chimney. - correct answer-6"
R1003.17 Masonry chimney cleanout openings.
What is the
minimumxrequiredxthicknessxofxthexbackxandxsidexwallsxofxaxmasonryxfire-
boxxconstructedxofxsolidxmasonryxwithoutxaxfirebrickxlining?x-xcorrectxanswer-10"
R1001.5xFireboxxwalls.
Wherexfirebricksxarexusedxasxliningxforxaxmasonryxfireplace,xthexmaximumxjointxspacingxshallxbex______
__
betweenxfirebricks.x-xcorrectxanswer-1/4"
R1001.5xFireboxxwalls.
Thexdamperxorxthroatxforxaxmasonryxfireplacexshallxbexlocatedxaxminimumxofx_______xabovexthexlintel
xsu
pportingxthexmasonryxoverxthexfireplacexopening.x-xcorrectxanswer-8"
R1001.7xLintelxandxthroat.
Minimumxrequiredxthicknessxforxthexhearthxofxaxmasonryxfireplacexshallxbex________.x-
x4correct
" xanswer-
R1001.9.1xHearth.
Woodxstudsxshallxhavexaxminimumxclearancexofx________fromxthexbackxfacexofxaxmasonryxfireplace
.x-
correctxanswer-4"
R1001.11xFireplacexclearance.
