403A Stair Construction

Question 1

What is the maximum unit rise permitted for interior stairs under the National Building Code of Canada?

Accepted Answer

200mm

Answer

180mm

Answer

220mm

Answer

250mm

Question 2

A staircase has a total rise of 2,800mm and requires 14 risers. What is the unit rise?

Accepted Answer

200mm

Answer

185mm

Answer

190mm

Answer

210mm

Question 3

Which stair component directly supports the treads and risers along the sides of the staircase?

Accepted Answer

Stringer

Answer

Newel post

Answer

Baluster

Answer

Nosing

Question 4

What is the minimum unit run (tread depth) required for residential stairs under the NBC?

Accepted Answer

235mm

Answer

210mm

Answer

220mm

Answer

250mm

Question 5

What is the minimum required headroom clearance for a staircase under the National Building Code of Canada?

Accepted Answer

1950mm

Answer

1800mm

Answer

1900mm

Answer

2100mm

Question 6

Using the stair comfort formula 2 × Rise + Run = 635mm, what tread depth is required for a unit rise of 190mm?

Accepted Answer

255mm

Answer

225mm

Answer

235mm

Answer

275mm

Question 7

What is the 'nosing' of a stair tread?

Accepted Answer

The horizontal projection of the tread beyond the riser below

Answer

The vertical face of the riser

Answer

The bottom rail of the handrail system

Answer

The angled cut at the base of the stringer