CBP Building Codes and Regulations 2

Question 1

Under the IRC, what is the maximum riser height permitted for a residential stairway?

Accepted Answer

7-3/4 inches

Answer

IRC R311.7.5.1 limits stair risers to a maximum of 7-3/4 inches.

Question 2

Which handrail height range does the IRC require, measured vertically from the sloped plane of the tread nosings?

Accepted Answer

34 to 38 inches

Answer

IRC R311.7.8.1 requires handrails between 34 and 38 inches above the tread nosings.

Question 3

An IRC guard is required on an open-sided deck when the walking surface is more than how high above the floor or grade below?

Accepted Answer

30 inches

Answer

IRC R312.1.1 requires guards where the walking surface is more than 30 inches above grade within 36 inches horizontally.

Question 4

Required guards must have openings that do not allow passage of a sphere of what diameter?

Accepted Answer

4 inches

Answer

IRC R312.1.3 limits guard openings to less than a 4-inch sphere, with exceptions at stair triangles and on the sides of stairs.

Question 5

What is the maximum sill height for an emergency escape and rescue opening above the finished floor?

Accepted Answer

44 inches

Answer

IRC R310.2.2 sets a maximum sill height of 44 inches above the floor.

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