OBC House Exam Practice Questions - Ontario Building Code Exam House Exam

Which of the following is true regarding holes drilled through wood floor joists for piping or electrical wiring?

Holes must not be larger than 1/4 the depth of the joist and located at least 50 mm from the edges. Holes can be drilled anywhere as long as they are reinforced with metal plates. Holes must not exceed 1/3 the depth of the joist and must be located in the top or bottom 50 mm of the joist. Holes are only permitted in the outer 1/3 of the span.

Correct Answer:

Holes must not be larger than 1/4 the depth of the joist and located at least 50 mm from the edges.

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