403A Stair Construction 3

Question 1

When calculating the number of risers for a staircase, the total rise is divided by the desired unit rise and the result is:

Accepted Answer

Rounded up to keep each riser within the maximum height

Answer

Rounded down to keep risers within the maximum height

Answer

Left as a decimal and applied to the first riser only

Answer

Multiplied by the unit run to verify the total run

Question 2

What is the required handrail height above the stair nosings according to the NBC?

Accepted Answer

865mm to 965mm

Answer

800mm to 900mm

Answer

900mm to 1000mm

Answer

1000mm to 1200mm

Question 3

An 'open stringer' (cut stringer or sawtooth stringer) is characterized by:

Accepted Answer

Notches cut along the top edge create a sawtooth profile to support treads and risers

Answer

Treads and risers fit into dadoes routed into the inside face

Answer

The stringer being left exposed on the open side of the stairs

Answer

No direct connection to the upper floor framing

Question 4

What is the purpose of a 'kicker plate' (kicker block) at the bottom of a stair stringer?

Accepted Answer

To anchor the base of the stringer to the floor and prevent it from kicking out under load

Answer

To connect the handrail to the newel post

Answer

To support the decorative trim at the base of the stairs

Answer

To allow the stringer to span over a concrete slab

Question 5

When cutting notches in a stair stringer, what is the minimum remaining depth of material at the notch to maintain structural integrity?

Accepted Answer

89mm (3-1/2")

Answer

63mm (2-1/2")

Answer

140mm (5-1/2")

Answer

184mm (7-1/4")

Question 6

Which formula is most commonly used to verify that a stair's rise-and-run combination will be comfortable for users?

Accepted Answer

2 × Rise + Run = 635mm

Answer

Rise + Run = 435mm

Answer

Rise × Run = 47,000mm²

Answer

Rise − Run = 115mm

Question 7

A staircase has 13 risers each measuring 191mm. What is the total rise of the staircase?

Accepted Answer

2,483mm

Answer

2,100mm

Answer

2,291mm

Answer

2,674mm