Ontario Building Code Exam: Complex Buildings

Under the 2024 Ontario Building Code, which major occupancy classification applies to an elementary school?

• AGroup A, Division 2
• BGroup A, Division 1
• CGroup A, Division 3
• DGroup D

A hospital or nursing home where medical treatment is provided is classified under which occupancy group and division?

• AGroup B, Division 2
• BGroup B, Division 1
• CGroup B, Division 3
• DGroup C

What is the occupancy classification of a medium-hazard industrial warehouse?

• AGroup F, Division 2
• BGroup F, Division 1
• CGroup F, Division 3
• DGroup E

Under the OBC, an office building that does not contain medical clinics or retail spaces is classified as which of the following?

• AGroup D
• BGroup C
• CGroup E
• DGroup A, Division 2

According to Table 3.1.17.1. of the 2024 OBC, what is the occupant load factor used to calculate the occupant load for a dining room (restaurant)?

• A1.20 m² per person
• B0.75 m² per person
• C0.40 m² per person
• D1.85 m² per person

Calculate the occupant load of a multi-storey office building's floor area that has a net office space of 1,395 m².

• A150 persons
• B100 persons
• C75 persons
• D125 persons

A school laboratory has a floor area of 368 m². What is the calculated occupant load for this laboratory space?

• A80 persons
• B200 persons
• C50 persons
• D100 persons

Under Table 3.1.17.1., what is the occupant load factor used to calculate the occupant load for retail space on the first storey of a department store?

• A3.70 m² per person
• B5.60 m² per person
• C9.30 m² per person
• D1.85 m² per person

A library reading room has a floor area of 185 m². What is the calculated occupant load for this room?

• A40 persons
• B100 persons
• C50 persons
• D20 persons

How does the OBC define 'building height' for the purpose of classifying a building under Part 3?

• AThe number of storeys contained between the roof and the floor of the first storey, or th…
• BThe maximum height of the building measured from the lowest foundation footings to the hi…
• CThe height measured in storeys above the basement floor level to the roof rafters
• DThe height in metres measured from the lowest level of fire department access to the roof…

A proposed 4-storey building contains a Group A, Division 2 assembly occupancy on the first storey and Group C residential occupancy on the upper three storeys. Under Subsection 3.2.2., how must the building's structural fire protection be classified?

• AAccording to the most restrictive major occupancy article between Group A-2 and Group C
• BAccording to the Group A-2 assembly occupancy rules only, since it is on the lowest storey
• CAccording to the Group C residential occupancy rules only, since it occupies the majority…
• DAccording to a mathematical average of the requirements of both occupancies

Which of the following is classified as a Group B, Division 3 occupancy under the OBC?

• AA retirement home or care facility without treatment, serving occupants who require care
• BA residential home for children where medical treatment is provided by nursing staff
• CA psychiatric hospital where patients are detained under lock and key
• DA commercial boarding house with an occupant load of fewer than 10 people

If a floor area has multiple uses that are not separated by fire separations, how is the occupant load of the entire floor area calculated?

• ABy applying the specific occupant load factor of Table 3.1.17.1. to the area of each indi…
• BBy applying the most restrictive factor of all the uses to the entire floor area
• CBy applying the least restrictive factor of all the uses to the entire floor area
• DBy dividing the entire area by a default factor of 9.3 m² per person

A building contains a Group A, Division 2 occupancy and a Group E occupancy. The occupancies are separated by a 1-hour fire separation. Under what condition is the building classified under the Group E articles of Subsection 3.2.2. rather than the Group A-2 articles?

• AThe building must be designed and constructed to meet the requirements of both major occu…
• BOnly if the Group E occupancy constitutes more than 90% of the total floor area
• COnly if the Group A, Division 2 occupancy is located entirely on the basement level
• DOnly if the Group E occupancy has a separate entrance and egress system

An assembly space (Group A-2) contains a combination of fixed seating (120 seats) and an open floor area of 80 m² without fixed seating. What is the total occupant load of this space?

• A226 persons
• B120 persons
• C200 persons
• D160 persons

What is the primary factor used to determine the required fire-resistance rating of a firewall?

• AThe major occupancy classifications of the buildings on either side of the firewall
• BThe total height of the firewall in metres
• CThe wind load capacity of the wall structure
• DThe type of sprinkler head used in the adjacent rooms

What is the minimum fire-resistance rating required for a firewall separating two Group C residential major occupancies?

• A2 hours
• B1 hour
• C3 hours
• D4 hours

Which material must a firewall be constructed of under the Ontario Building Code?

• AConcrete or masonry
• BGypsum board on steel studs
• CHeavy timber elements
• DAny noncombustible material

What is the definition of 'limiting distance' under Part 3 of the OBC?

• AThe distance from an exposing building face to a property line, street centerline, or an…
• BThe maximum travel distance an occupant must walk to reach the nearest exit door
• CThe minimum distance required between a building exit and a public thoroughfare
• DThe distance from a fire hydrant to the main building entrance

A fire separation is required to have a 1-hour fire-resistance rating. What is the standard fire-protection rating required for a closure (door) installed in this separation?

• A45 minutes
• B1 hour
• C30 minutes
• D1.5 hours

Which of the following describes an 'exposing building face' under the OBC?

• AThe part of an exterior wall of a building that faces one direction and is located betwee…
• BThe wall of a building that contains the primary entrance and faces the street
• CThe total surface area of all exterior walls of a building added together
• DThe wall that faces the closest adjacent building on a neighboring lot

What is the fire separation rating required between a Group C residential occupancy and a Group D office occupancy?

• A1 hour
• B2 hours
• C3 hours
• DNo separation required

If a firewall separates a Group F, Division 1 occupancy from any other major occupancy, what is the minimum required fire-resistance rating of the firewall?

• A4 hours
• B2 hours
• C3 hours
• D1.5 hours

Under Subsection 3.2.3., if a building is sprinklered, how does this affect the allowable area of unprotected openings in the exposing building face?

• AIt generally doubles the allowable percentage of unprotected openings compared to a non-s…
• BIt eliminates the need for spatial separation calculations entirely
• CIt allows 100% unprotected openings regardless of the limiting distance
• DIt reduces the required limiting distance by exactly 50%

A firewall must divide a building into separate fire compartments. What structural condition must be met by a firewall?

• AIt must remain structurally stable and standing even if the structure on either side coll…
• BIt must be supported by steel columns with a fire-resistance rating of at least 4 hours
• CIt must be constructed with structural steel framing inside the concrete blocks
• DIt must be designed to withstand a horizontal seismic force of at least 10 kN/m

What is the fire-resistance rating required for a fire separation between a Group C residential suite and an adjoining Group E mercantile shop in a building that is NOT sprinklered?

• A2 hours
• B1 hour
• C1.5 hours
• D3 hours

In a non-sprinklered building, if the fire department response time to the location exceeds 10 minutes in 10% or more of all calls, what adjustment must be made to spatial separation calculations under Sentence 3.2.3.1.(8)?

• AThe limiting distance used in calculations must be taken as 50% of the actual limiting di…
• BThe allowable area of unprotected openings is reduced by exactly 25%
• CThe building must be redesigned to have 0% unprotected openings on all walls
• DThe exposing building face area must be multiplied by a factor of 1.5

What is the fire-resistance rating required for a fire separation between a public corridor and an adjoining suite in a Group C residential occupancy?

• A1 hour
• B45 minutes
• C30 minutes
• D2 hours

If a structural steel column supports a floor assembly that is required to have a 2-hour fire-resistance rating, what is the required fire-resistance rating of the steel column itself?

• AAt least 2 hours
• BAt least 1 hour
• CAt least 1.5 hours
• DSteel columns do not require fireproofing if they are structural

What is the maximum permitted flame-spread rating of the interior wall and ceiling finishes of an exit stairway?

• ANot more than 25
• BNot more than 75
• CNot more than 150
• DNot more than 50

Under what condition does a service room (such as a boiler room or electrical room) require a 2-hour fire separation under the OBC?

• AIf it contains fuel-fired equipment or high-voltage transformers and is located in a buil…
• BOnly if the building is more than 6 storeys in height
• CIf it is located directly adjacent to a residential suite
• DAll service rooms require a 2-hour fire separation regardless of equipment

What is the minimum fire-resistance rating of a floor assembly over a crawl space that is NOT used for services or storage?

• ANo fire-resistance rating is required
• BAt least 45 minutes
• CAt least 1 hour
• DAt least 2 hours

Wired glass and glass block assemblies are permitted as closures in fire separations under the OBC. What is their maximum fire-protection rating limit as a closure?

• ANot more than 1 hour (60 minutes)
• BNot more than 45 minutes
• CNot more than 2 hours
• DWired glass has no limit if installed in a steel frame

What is the required fire-resistance rating of a fire separation between a public corridor and an office suite in a non-sprinklered building?

• A1 hour
• BNo separation required
• C45 minutes
• D2 hours

Under Subsection 3.2.3., if a building wall is skewed or not parallel to the property line, how is the limiting distance determined?

• AIt must be calculated at the point of closest proximity to the property line, or by using…
• BIt is measured from the centroid of the building to the property line
• CBy taking the average of the closest and furthest points of the wall
• DBy ignoring the skew and measuring from the main building entrance

A 5-storey building is of noncombustible construction. A firewall divides this building. What must the firewall be connected to in order to ensure its stability?

• AIt must structural-wise extend from the foundation to a point at least 150 mm above the r…
• BIt must be bolted directly to the structural steel columns on both sides of the wall
• CIt must be cantilevered from the central core of the building
• DIt does not require vertical extension if the roof is noncombustible

A retail store (Group E) is located on the first storey of a 4-storey residential building (Group C). The building is sprinklered. What is the required fire-resistance rating of the floor assembly separating the store from the residential suites above?

• A2 hours
• B1 hour
• C1.5 hours
• DNo separation required

A storage garage (Group F, Division 3) is located beneath a residential building (Group C). What is the minimum required fire-resistance rating of the floor assembly separating the garage from the residential suites above?

• A2 hours
• B1.5 hours
• C1 hour
• D3 hours

Under Subsection 3.2.3., if the limiting distance of a building face is less than 1.2 metres, what is the maximum percentage of unprotected openings permitted in that exposing building face?

• A0%
• B4%
• C8%
• D10%

A commercial building contains an atrium that intersects four storeys (interconnected floor space). Which subsection of the OBC governs the fire safety and smoke control measures required for this design?

• ASubsection 3.2.8.
• BSubsection 3.2.6.
• CSubsection 3.4.2.
• DSubsection 3.1.10.

What is the minimum width of a public corridor serving a Group D business occupancy?

• A1,100 mm
• B1,650 mm
• C900 mm
• D1,200 mm

What is the minimum number of exits required from a floor area in a building regulated under Part 3 of the OBC?

• AAt least 2 exits
• B1 exit is sufficient for all buildings
• CAt least 3 exits
• DThe number of exits is determined solely by the local fire chief

What is the maximum riser height for steps in an exit stairway under Part 3 of the OBC?

• A180 mm
• B200 mm
• C150 mm
• D210 mm

In which direction must an egress door swing if it serves an area with an occupant load of more than 60 people?

• AIn the direction of exit travel
• BInwards, to keep the corridor clear
• CIt must be a sliding door only
• DThe direction of swing does not matter if it is a fire-rated door

What is the minimum clear headroom clearance required in an exit stairway?

• A2,050 mm
• B1,950 mm
• C2,100 mm
• D1,800 mm

Under the OBC, are spiral stairs permitted as a required exit in a Part 3 building?

• ANo, they are prohibited as required exits
• BYes, but only for residential occupancies
• CYes, if they have a diameter of at least 2.0 metres
• DYes, if they serve an occupant load of fewer than 10 people

What is the minimum tread depth (run) for steps in an exit stairway under Part 3 of the OBC?

• A280 mm
• B250 mm
• C300 mm
• D210 mm