Chimney Safety Institute Of America (How To Inspect)
– Questions With Logical Solutions
Masonry chimneys are sometimes corbeled, which means that several
successive courses are extended outward. Sometimes corbeling is observed
from the unfinished attic space. Corbeling is usually observed in a location of
the chimney just before the chimneystack rises up through the roof.
Masonry chimneys shall not be corbeled more than one-half of the chimney
wall's thickness from a wall or foundation. The projection of a single course
shall not exceed one-half the unit's height, or one-third of the unit's bed depth,
whichever is less.
Type L Correct Answer - Vent material for chimney
Pipe Thickness Correct Answer - for 6 inch or smaller use 26-gauge
galvanized sheet metal
For a masonry chimney flue Correct Answer - the connector vent pipe
must connect at a point at least 12 inches above the lowest portion of the
interior of the chimney flue. Some building codes provide for only 8 inches.
Connector vent pipes should be installed in accordance with the
manufacturer's installation instructions.
maximum length of an uninsulated connector pipe to a natural draft chimney
is Correct Answer - 10 feet.
the horizontal run of an uninsulated connector pipe to a natural draft chimney
should not exceed Correct Answer - 75% of the height of the chimney
above the connector.
The horizontal run of a listed and labeled connector pipe to a natural draft
chimney should not exceed Correct Answer - 100% of the chimney
height above the connector.
Connectors should be sloped Correct Answer - at least 1/4-inch of rise
per foot of run.
,Connector joints should be Correct Answer - fastened with sheet metal
screws or rivets.
A chimney connector pipe or vent connector pipe should not pass through
Correct Answer - any floor or ceiling. It should not pass through a wall
either, unless it's listed and labeled for a wall pass-through.
A single-wall metal pipe used as a vent connector passing through a wall,
ceiling or floor must be Correct Answer - guarded by a ventilated, non-
combustible metal thimble, and must maintain a minimum clearance of 6
inches between the thimble and any combustibles
A non-combustible thimble must be used where Correct Answer - a
single-wall metal pipe passes through a roof constructed of combustible
material
For unlisted single-wall chimneys and vent connectors Correct Answer -
It would be uncommon to find a single-wall metal pipe passing through a
ceiling, wall, floor, or roof.
a single-wall metal pipe used as a vent connector Correct Answer - must
maintain a minimum clearance of 18 inches between the metal pipe and any
combustibles.
The size of the connector pipe Correct Answer - should not be smaller
than the flue collar of the appliance. The pipe should not reduce or restrict
itself.
Inlets to masonry chimneys Correct Answer - must enter from the side.
Inlets must have a thimble made of fireclay, rigid refractory material, or metal
that will prevent the connector from pulling out of the inlet or from extending
beyond the wall of the liner.
Chimneys should be high enough Correct Answer - to prevent
downdrafts caused by wind.
The 3-2-10 Rule for masonry chimneys Correct Answer - states that a
masonry chimney should extend at least 3 feet above the highest point where
, the chimney passes through the roof, and 2 feet above any portion of a
building that is within a 10-foot distance horizontally.
House framing components Correct Answer - should be at least 2 inches
away from the chimney wall
Open spaces between the chimney wall and the combustible building
materials Correct Answer - should be sealed and insulated with non-
combustible material.
A masonry chimney Correct Answer - has its own footing and is built in a
way such that the chimney provides no support to, nor receives support from,
the house structure.
The chimney footer Correct Answer - may be connected with the house
foundation and footing
Footings for masonry chimneys Correct Answer - must be made of
concrete or solid masonry at least 1 foot thick. They should extend at least 6
inches beyond the face of the fireplace or foundation wall on all sides.
Footings for masonry fireplaces Correct Answer - must extend below the
frost line. They must be installed on natural, undisturbed earth or engineered
fill below frost depth. In climate areas not subject to freezing, the footings
should be installed at least 1 foot below the finished grade.
All masonry chimneys must be lined. Correct Answer - The chimney
lining must be appropriate for the type of fireplace, stove, appliance, or
heating system connected to it.
The walls of the masonry chimney having a clay interior flue Correct
Answer - should be at least 4 inches thick, considering a standard brick is
3-5/8-inches wide.
The minimum standard thickness for a flue lining is Correct Answer -
5/8-inch thick
The size of the chimney depends on the Correct Answer - number and
size of the flues.
– Questions With Logical Solutions
Masonry chimneys are sometimes corbeled, which means that several
successive courses are extended outward. Sometimes corbeling is observed
from the unfinished attic space. Corbeling is usually observed in a location of
the chimney just before the chimneystack rises up through the roof.
Masonry chimneys shall not be corbeled more than one-half of the chimney
wall's thickness from a wall or foundation. The projection of a single course
shall not exceed one-half the unit's height, or one-third of the unit's bed depth,
whichever is less.
Type L Correct Answer - Vent material for chimney
Pipe Thickness Correct Answer - for 6 inch or smaller use 26-gauge
galvanized sheet metal
For a masonry chimney flue Correct Answer - the connector vent pipe
must connect at a point at least 12 inches above the lowest portion of the
interior of the chimney flue. Some building codes provide for only 8 inches.
Connector vent pipes should be installed in accordance with the
manufacturer's installation instructions.
maximum length of an uninsulated connector pipe to a natural draft chimney
is Correct Answer - 10 feet.
the horizontal run of an uninsulated connector pipe to a natural draft chimney
should not exceed Correct Answer - 75% of the height of the chimney
above the connector.
The horizontal run of a listed and labeled connector pipe to a natural draft
chimney should not exceed Correct Answer - 100% of the chimney
height above the connector.
Connectors should be sloped Correct Answer - at least 1/4-inch of rise
per foot of run.
,Connector joints should be Correct Answer - fastened with sheet metal
screws or rivets.
A chimney connector pipe or vent connector pipe should not pass through
Correct Answer - any floor or ceiling. It should not pass through a wall
either, unless it's listed and labeled for a wall pass-through.
A single-wall metal pipe used as a vent connector passing through a wall,
ceiling or floor must be Correct Answer - guarded by a ventilated, non-
combustible metal thimble, and must maintain a minimum clearance of 6
inches between the thimble and any combustibles
A non-combustible thimble must be used where Correct Answer - a
single-wall metal pipe passes through a roof constructed of combustible
material
For unlisted single-wall chimneys and vent connectors Correct Answer -
It would be uncommon to find a single-wall metal pipe passing through a
ceiling, wall, floor, or roof.
a single-wall metal pipe used as a vent connector Correct Answer - must
maintain a minimum clearance of 18 inches between the metal pipe and any
combustibles.
The size of the connector pipe Correct Answer - should not be smaller
than the flue collar of the appliance. The pipe should not reduce or restrict
itself.
Inlets to masonry chimneys Correct Answer - must enter from the side.
Inlets must have a thimble made of fireclay, rigid refractory material, or metal
that will prevent the connector from pulling out of the inlet or from extending
beyond the wall of the liner.
Chimneys should be high enough Correct Answer - to prevent
downdrafts caused by wind.
The 3-2-10 Rule for masonry chimneys Correct Answer - states that a
masonry chimney should extend at least 3 feet above the highest point where
, the chimney passes through the roof, and 2 feet above any portion of a
building that is within a 10-foot distance horizontally.
House framing components Correct Answer - should be at least 2 inches
away from the chimney wall
Open spaces between the chimney wall and the combustible building
materials Correct Answer - should be sealed and insulated with non-
combustible material.
A masonry chimney Correct Answer - has its own footing and is built in a
way such that the chimney provides no support to, nor receives support from,
the house structure.
The chimney footer Correct Answer - may be connected with the house
foundation and footing
Footings for masonry chimneys Correct Answer - must be made of
concrete or solid masonry at least 1 foot thick. They should extend at least 6
inches beyond the face of the fireplace or foundation wall on all sides.
Footings for masonry fireplaces Correct Answer - must extend below the
frost line. They must be installed on natural, undisturbed earth or engineered
fill below frost depth. In climate areas not subject to freezing, the footings
should be installed at least 1 foot below the finished grade.
All masonry chimneys must be lined. Correct Answer - The chimney
lining must be appropriate for the type of fireplace, stove, appliance, or
heating system connected to it.
The walls of the masonry chimney having a clay interior flue Correct
Answer - should be at least 4 inches thick, considering a standard brick is
3-5/8-inches wide.
The minimum standard thickness for a flue lining is Correct Answer -
5/8-inch thick
The size of the chimney depends on the Correct Answer - number and
size of the flues.
