2025 IRC Exam - Chapters 10, 11 - Chimneys
& Fireplaces, Energy Efficiency Questions
with Correct Answers
Footings for masonry fireplaces and their chimneysEshall 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. -Ecorrect 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 havingEa minimum thicknessEof . - 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 minimum required thickness of the back and side walls of a masonry fire-
box constructed of solid masonry without a firebrickElining? - correct answer-10"
R1001.5 Firebox walls.
Where firebricks are used as lining for a masonry fireplace, the maximum jointEspacing shall be
between firebricks. - correct answer-1/4"
R1001.5 Firebox walls.
The damper or throat for a masonry fireplace shall be located a minimum of above the lintel su
pporting the masonry over the fireplace opening. - correct answer-8"
R1001.7 Lintel and throat.
Minimum required thickness for the hearth of a masonry fireplace shall be . - correct answer-
4"
R1001.9.1 Hearth.
Wood studs shall have a minimum clearance of from the back face of a masonry fireplace. -
correct answer-4"
R1001.11 Fireplace clearance.
& Fireplaces, Energy Efficiency Questions
with Correct Answers
Footings for masonry fireplaces and their chimneysEshall 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. -Ecorrect 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 havingEa minimum thicknessEof . - 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 minimum required thickness of the back and side walls of a masonry fire-
box constructed of solid masonry without a firebrickElining? - correct answer-10"
R1001.5 Firebox walls.
Where firebricks are used as lining for a masonry fireplace, the maximum jointEspacing shall be
between firebricks. - correct answer-1/4"
R1001.5 Firebox walls.
The damper or throat for a masonry fireplace shall be located a minimum of above the lintel su
pporting the masonry over the fireplace opening. - correct answer-8"
R1001.7 Lintel and throat.
Minimum required thickness for the hearth of a masonry fireplace shall be . - correct answer-
4"
R1001.9.1 Hearth.
Wood studs shall have a minimum clearance of from the back face of a masonry fireplace. -
correct answer-4"
R1001.11 Fireplace clearance.
