NASCLA Commercial Building Exam | 308 QUESTIONS
AND ANSWERS
What is the minimum ceiling height for means of Egress? ANSW - Not less than 7 feet 6 inches
Emergency Power must illuminate for how long? ANSW - No less than 90 minutes
Elevators are required in a building with how many stories? ANSW - More than 3 (or at least 4).
What is the size of the refuge space for one wheel chair? ANSW - 30 inches by 48 inches
Each area of refuge shall be separated from the remainder of the story by what? ANSW - Smoke Barrier
What is the minimum width of a door? ANSW - 32 Inches
The minimum clear opening height of doors shall be no less than (at least) ANSW - 80 inches
Which direction should a hinge door swing when the building occupies more than 50 people or is
classified as Group "H"? ANSW - In the direction of egress
The force for pushing or pulling open interior swinging egress non fire doors shall not exceed how many
pounds? ANSW - No more than 5LBS
Clear opening below a door should be no more than ANSW - 4 inches
Panic hardware is required when ANSW - There are more than 50 possible occupants
The maximum unlatching force of panic or fire hardware should not exceed how many pounds? ANSW -
15lbs
Stairway width for less than 50 people is ANSW - 36 inches
,Stairway width for more than 50 people ANSW - 44 inches
Handrails should extend passed the top riser by ANSW - 12 inches
Maximum handrail width is ANSW - 2 inches
Where handrails are not continuous between flights, the handrails should extend horizontally how many
inches? ANSW - 12 inches
Clear space between handrail and wall ANSW - 1 1/2
Required guards shall not have an opening how large? ANSW - 4 inches
Corridor width chart can be found in what book? ANSW - 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? ANSW - 44 inches measure from floor
Accessible parking Spaces chart can be found where? ANSW - 2018 IBC Page 308
Net Free Ventilating area shall not be less than ANSW - 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? ANSW
- 24 inches
Lap siding should have minimum lap of how many inches? ANSW - 1 and 1/4 inches
Metal flashing on walls, roof intersections, no less than how thick? ANSW - 0.019
What class assemblies are most effective against severe fire test? ANSW - Class A
, Asphalt shingles should only be used on roof slopes ANSW - Of two units vertical in 12 units horizontal
(17%)
Valley lining material thickness chart can be found where? ANSW - IBC 351
Wood Shake and Wood shingle exposure table ANSW - IBC 352
Minimum Slope of a roof is ANSW - 1/4 : 1
Allowable deflection table can be found ANSW - IBC 363
A geotechnical investigation must be conducted when: ANSW - When backfilling more than 12inches
under a footer
The grade away from a building must be ANSW - 5% for at least 10 feet
Dampproofing must be applied from where? ANSW - Footer to above grade
Where should a foundation drain be placed? ANSW - Top of the drain at least 6 inches above the top of
the footing, filter fabric over stone
Sandy, silty sand, clayey, table - found where? ANSW - 434 IBC
Backfill compressive strength has to be what PSI? ANSW - At least 2000 PSI
Minimum Depth of footings below undisturbed ground surface should be how deep? ANSW - 12 inches
Minimum width of footing is ANSW - 12 inches
Flange projections shall not exceed what dimension? ANSW - 14 times the minimum thickness of metal
and flange width shall not be less than 80% of the depth of the section
AND ANSWERS
What is the minimum ceiling height for means of Egress? ANSW - Not less than 7 feet 6 inches
Emergency Power must illuminate for how long? ANSW - No less than 90 minutes
Elevators are required in a building with how many stories? ANSW - More than 3 (or at least 4).
What is the size of the refuge space for one wheel chair? ANSW - 30 inches by 48 inches
Each area of refuge shall be separated from the remainder of the story by what? ANSW - Smoke Barrier
What is the minimum width of a door? ANSW - 32 Inches
The minimum clear opening height of doors shall be no less than (at least) ANSW - 80 inches
Which direction should a hinge door swing when the building occupies more than 50 people or is
classified as Group "H"? ANSW - In the direction of egress
The force for pushing or pulling open interior swinging egress non fire doors shall not exceed how many
pounds? ANSW - No more than 5LBS
Clear opening below a door should be no more than ANSW - 4 inches
Panic hardware is required when ANSW - There are more than 50 possible occupants
The maximum unlatching force of panic or fire hardware should not exceed how many pounds? ANSW -
15lbs
Stairway width for less than 50 people is ANSW - 36 inches
,Stairway width for more than 50 people ANSW - 44 inches
Handrails should extend passed the top riser by ANSW - 12 inches
Maximum handrail width is ANSW - 2 inches
Where handrails are not continuous between flights, the handrails should extend horizontally how many
inches? ANSW - 12 inches
Clear space between handrail and wall ANSW - 1 1/2
Required guards shall not have an opening how large? ANSW - 4 inches
Corridor width chart can be found in what book? ANSW - 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? ANSW - 44 inches measure from floor
Accessible parking Spaces chart can be found where? ANSW - 2018 IBC Page 308
Net Free Ventilating area shall not be less than ANSW - 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? ANSW
- 24 inches
Lap siding should have minimum lap of how many inches? ANSW - 1 and 1/4 inches
Metal flashing on walls, roof intersections, no less than how thick? ANSW - 0.019
What class assemblies are most effective against severe fire test? ANSW - Class A
, Asphalt shingles should only be used on roof slopes ANSW - Of two units vertical in 12 units horizontal
(17%)
Valley lining material thickness chart can be found where? ANSW - IBC 351
Wood Shake and Wood shingle exposure table ANSW - IBC 352
Minimum Slope of a roof is ANSW - 1/4 : 1
Allowable deflection table can be found ANSW - IBC 363
A geotechnical investigation must be conducted when: ANSW - When backfilling more than 12inches
under a footer
The grade away from a building must be ANSW - 5% for at least 10 feet
Dampproofing must be applied from where? ANSW - Footer to above grade
Where should a foundation drain be placed? ANSW - Top of the drain at least 6 inches above the top of
the footing, filter fabric over stone
Sandy, silty sand, clayey, table - found where? ANSW - 434 IBC
Backfill compressive strength has to be what PSI? ANSW - At least 2000 PSI
Minimum Depth of footings below undisturbed ground surface should be how deep? ANSW - 12 inches
Minimum width of footing is ANSW - 12 inches
Flange projections shall not exceed what dimension? ANSW - 14 times the minimum thickness of metal
and flange width shall not be less than 80% of the depth of the section
