NASCLA Commercial Building Exam fully
solved & updated (latest version verified
for accuracy) | Latest Update 2026
What is the minimum ceiling height for means of Egress? -CORRECTANSWER Not
less than 7 feet 6 inches
Emergency Power must illuminate for how long? -CORRECTANSWER No less than 90
minutes
Elevators are required in a building with how many stories? -CORRECTANSWER More
than 3 (or at least 4).
What is the size of the refuge space for one wheel chair? -CORRECTANSWER 30
inches by 48 inches
Each area of refuge shall be separated from the remainder of the story by what? -
CORRECTANSWER Smoke Barrier
What is the minimum width of a door? -CORRECTANSWER 32 Inches
The minimum clear opening height of doors shall be no less than (at least) -
CORRECTANSWER 80 inches
,Which direction should a hinge door swing when the building occupies more than 50
people or is classified as Group "H"? -CORRECTANSWER In the direction of egress
The force for pushing or pulling open interior swinging egress non fire doors shall not
exceed how many pounds? -CORRECTANSWER No more than 5LBS
Clear opening below a door should be no more than -CORRECTANSWER 4 inches
Panic hardware is required when -CORRECTANSWER There are more than 50
possible occupants
The maximum unlatching force of panic or fire hardware should not exceed how many
pounds? -CORRECTANSWER 15lbs
Stairway width for less than 50 people is -CORRECTANSWER 36 inches
Stairway width for more than 50 people -CORRECTANSWER 44 inches
Handrails should extend passed the top riser by -CORRECTANSWER 12 inches
Maximum handrail width is -CORRECTANSWER 2 inches
,Where handrails are not continuous between flights, the handrails should extend
horizontally how many inches? -CORRECTANSWER 12 inches
Clear space between handrail and wall -CORRECTANSWER 1 1/2
Required guards shall not have an opening how large? -CORRECTANSWER 4 inches
Corridor width chart can be found in what book? -CORRECTANSWER 2018 IBC (Thick
blue book) page 287
Emergency escape and rescue openings shall have the bottom of the opening not
greater than how many inches? -CORRECTANSWER 44 inches measure from floor
Accessible parking Spaces chart can be found where? -CORRECTANSWER 2018 IBC
Page 308
Net Free Ventilating area shall not be less than -CORRECTANSWER 1/150th of the
area of the space ventilated (Page 321 IBC)
The spacing of the ties or fastenings for exterior metal veneer shall not exceed how
many inches? -CORRECTANSWER 24 inches
, Lap siding should have minimum lap of how many inches? -CORRECTANSWER 1 and
1/4 inches
Metal flashing on walls, roof intersections, no less than how thick? -
CORRECTANSWER 0.019
What class assemblies are most effective against severe fire test? -
CORRECTANSWER Class A
Asphalt shingles should only be used on roof slopes -CORRECTANSWER Of two units
vertical in 12 units horizontal (17%)
Valley lining material thickness chart can be found where? -CORRECTANSWER IBC
351
Wood Shake and Wood shingle exposure table -CORRECTANSWER IBC 352
Minimum Slope of a roof is -CORRECTANSWER 1/4 : 1
Allowable deflection table can be found -CORRECTANSWER IBC 363
A geotechnical investigation must be conducted when: -CORRECTANSWER When
backfilling more than 12inches under a footer
solved & updated (latest version verified
for accuracy) | Latest Update 2026
What is the minimum ceiling height for means of Egress? -CORRECTANSWER Not
less than 7 feet 6 inches
Emergency Power must illuminate for how long? -CORRECTANSWER No less than 90
minutes
Elevators are required in a building with how many stories? -CORRECTANSWER More
than 3 (or at least 4).
What is the size of the refuge space for one wheel chair? -CORRECTANSWER 30
inches by 48 inches
Each area of refuge shall be separated from the remainder of the story by what? -
CORRECTANSWER Smoke Barrier
What is the minimum width of a door? -CORRECTANSWER 32 Inches
The minimum clear opening height of doors shall be no less than (at least) -
CORRECTANSWER 80 inches
,Which direction should a hinge door swing when the building occupies more than 50
people or is classified as Group "H"? -CORRECTANSWER In the direction of egress
The force for pushing or pulling open interior swinging egress non fire doors shall not
exceed how many pounds? -CORRECTANSWER No more than 5LBS
Clear opening below a door should be no more than -CORRECTANSWER 4 inches
Panic hardware is required when -CORRECTANSWER There are more than 50
possible occupants
The maximum unlatching force of panic or fire hardware should not exceed how many
pounds? -CORRECTANSWER 15lbs
Stairway width for less than 50 people is -CORRECTANSWER 36 inches
Stairway width for more than 50 people -CORRECTANSWER 44 inches
Handrails should extend passed the top riser by -CORRECTANSWER 12 inches
Maximum handrail width is -CORRECTANSWER 2 inches
,Where handrails are not continuous between flights, the handrails should extend
horizontally how many inches? -CORRECTANSWER 12 inches
Clear space between handrail and wall -CORRECTANSWER 1 1/2
Required guards shall not have an opening how large? -CORRECTANSWER 4 inches
Corridor width chart can be found in what book? -CORRECTANSWER 2018 IBC (Thick
blue book) page 287
Emergency escape and rescue openings shall have the bottom of the opening not
greater than how many inches? -CORRECTANSWER 44 inches measure from floor
Accessible parking Spaces chart can be found where? -CORRECTANSWER 2018 IBC
Page 308
Net Free Ventilating area shall not be less than -CORRECTANSWER 1/150th of the
area of the space ventilated (Page 321 IBC)
The spacing of the ties or fastenings for exterior metal veneer shall not exceed how
many inches? -CORRECTANSWER 24 inches
, Lap siding should have minimum lap of how many inches? -CORRECTANSWER 1 and
1/4 inches
Metal flashing on walls, roof intersections, no less than how thick? -
CORRECTANSWER 0.019
What class assemblies are most effective against severe fire test? -
CORRECTANSWER Class A
Asphalt shingles should only be used on roof slopes -CORRECTANSWER Of two units
vertical in 12 units horizontal (17%)
Valley lining material thickness chart can be found where? -CORRECTANSWER IBC
351
Wood Shake and Wood shingle exposure table -CORRECTANSWER IBC 352
Minimum Slope of a roof is -CORRECTANSWER 1/4 : 1
Allowable deflection table can be found -CORRECTANSWER IBC 363
A geotechnical investigation must be conducted when: -CORRECTANSWER When
backfilling more than 12inches under a footer
