100+ Free OBC Small Buildings Practice Questions

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Sample OBC Small Buildings Practice Questions

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1Under OBC 9.15.3.4., what is the minimum width of concrete footings supporting a 3-storey wood-frame exterior wall with no masonry veneer?

A.300 mm

B.350 mm

C.450 mm

D.600 mm

Explanation: Table 9.15.3.4. of the Ontario Building Code specifies minimum footing widths by the number of storeys supported: 250 mm for 1 storey, 350 mm for 2 storeys, and 450 mm for 3 storeys of wood-frame construction with no masonry veneer.

2According to OBC 9.12.2.2., what is the minimum depth of foundation below finished grade for a heated building on fine sand or silt to prevent frost damage?

A.1.2 m

B.1.0 m

C.1.4 m

D.1.6 m

Explanation: Under OBC 9.12.2.2., the minimum depth of foundation below finished grade for a heated building founded on clay, fine sand, or silt is 1.2 m to prevent frost action.

3Under OBC 9.23.4.1. / 9.4.1.2., what is the maximum allowable elastic deflection for a floor joist supporting a finished gypsum board ceiling?

A.L/180

B.L/240

C.L/360

D.L/480

Explanation: OBC specifies that members supporting finished ceilings subject to cracking, such as gypsum board or plaster, must not exceed an elastic deflection of L/360 under live load.

4For structural design under OBC 9.4.2.2., the specified snow load on a roof is calculated using which formula?

A.S = C_b * S_s * S_r

B.S = C_b * S_s + S_r

C.S = S_s + S_r

D.S = S_s / C_b + S_r

Explanation: According to OBC 9.4.2.2., the specified snow load S on a roof or other surface is calculated as S = C_b * S_s + S_r, where C_b is the basic roof snow load factor, S_s is the ground snow load, and S_r is the associated rain load.

5Under OBC 9.23.6.1., what is the maximum spacing of anchor bolts used to secure a wood sill plate to a foundation wall?

A.1.2 m

B.1.5 m

C.2.4 m

D.3.0 m

Explanation: Under OBC 9.23.6.1., foundation plates (sill plates) must be anchored to the foundation wall with anchor bolts spaced at not more than 2.4 m o.c. (on centre).

6Under OBC Table 9.15.4.2.A., what is the minimum thickness of a concrete foundation wall supporting wood-frame construction where the height of finished backfill exceeds 1.2 m but is not more than 2.1 m, and the wall is laterally supported at the top?

A.150 mm

B.200 mm

C.250 mm

D.300 mm

Explanation: Under OBC Table 9.15.4.2.A., concrete foundation walls that are laterally supported at the top must have a minimum thickness of 200 mm when the height of finished backfill is between 1.2 m and 2.1 m.

7Under OBC Table 9.23.14.3., what is the minimum thickness of plywood subflooring for floor joists spaced at 400 mm (16 inches) on centre?

A.12.5 mm

B.15.5 mm

C.18.5 mm

D.22.0 mm

Explanation: According to OBC Table 9.23.14.3., the minimum thickness of plywood subflooring (with edges supported) for floor joists spaced up to 400 mm o.c. is 15.5 mm.

8According to OBC 9.23.4.2., notches made in the top or bottom of wood floor joists must not exceed what proportion of the joist depth?

A.1/4 of the depth

B.1/3 of the depth

C.1/6 of the depth

D.1/2 of the depth

Explanation: Under OBC 9.23.4.2., notches made in the top or bottom of joists, rafters, or beams must not exceed 1/6 of the depth of the member, and must not be located in the middle third of the span.

9According to OBC 9.15.3.6., concrete footings must have a thickness that is at least equal to:

A.The footing projection from the foundation wall

B.Double the footing projection from the foundation wall

C.100 mm

D.150 mm in all cases

Explanation: OBC 9.15.3.6. states that the thickness of footings must be not less than the projection of the footing beyond the wall or column base, and in no case less than 100 mm.

10Under OBC 9.23.10.2., wood-frame walls must be braced to resist lateral wind and seismic loads. Which of the following satisfies the prescriptive requirements for bracing exterior walls?

A.Only interior walls require bracing

B.Sheathing conforming to Part 9 or diagonal wood strapping

C.Gypsum board applied to one side of the studs only

D.A minimum of 50% wall glazing

Explanation: OBC 9.23.10.2. outlines wall bracing options, which prescriptively include structural sheathing (such as OSB, plywood, or fiberboard) or diagonal wood strapping installed at an angle of approximately 45 degrees.

About the OBC Small Buildings Exam

This practice exam covers structural design loads, fire protection, building envelope, materials, and administrative requirements for small buildings under the Ontario Building Code.

Assessment

100 multiple-choice questions

Time Limit

3.5 hours

Passing Score

60%

Exam Fee

Free (Ontario Ministry of Municipal Affairs and Housing)

OBC Small Buildings Exam Content Outline

20%

Structural Design & Loads

Dead loads, live loads, wind/snow loads, framing, foundations, and wood/masonry design.

20%

Fire Protection & Safety

Fire-resistance ratings, spatial separation, fire stops, means of egress, and flame-spread ratings.

20%

Building Envelope & Insulation

Thermal insulation, air/vapor barriers, roofing, windows, and moisture control.

20%

Materials & Construction Methods

Standard concrete mix, masonry, structural steel, wood framing, and fasteners specifications.

20%

Administrative Requirements

OBC administration, building permits, inspection stages, occupancy permits, and legal authorities.

How to Pass the OBC Small Buildings Exam

What You Need to Know

Passing score: 60%
Assessment: 100 multiple-choice questions
Time limit: 3.5 hours
Exam fee: Free

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Frequently Asked Questions

What is the format of the OBC Small Buildings exam?

The exam consists of 100 multiple-choice questions covering all five content domains.

What is the passing score for the OBC Small Buildings exam?

Candidates must score at least 60% to pass the exam.