Question 1

What are the requirements of the International Residential Code for minimum tread width (T)and riser height
(R)for a single family home?

Accepted Answer

Minimum value of T =

Question 2

Using a sketch, explain the difference between a handrail and guardrail of a stair, and give their code- mandated heights.

Accepted Answer

A handrail is a rail that is designed to

Question 3

A rule- of- thumb formula is used in proportioning the tread width (T)and riser height (R)of a stair. Write the formula and the rationale behind it.

Accepted Answer

Formula: 2

Question 4

Using a sketch, describe a cantilevered freestanding stair.

Accepted Answer

A cantilevered freestanding stair is a t

Question 5

List the factors that determine the width of a stair.

Accepted Answer

The width of a stair is determined by se

Question 6

What are the requirements of the International Building Code for minimum tread width (T)and riser height (R)of a stair?

Accepted Answer

Minimum value of T =

Question 7

Stairs are essential in any building with two or more stories. They serve two important functions: (i)transport people between stories and (ii)serve as fire escape stairs. However, because of a stair's rhythmic form, the stairs were historically designed as an aesthetic element in entrance foyers of many buildings. The entrance foyers of contemporary buildings do not include any stairs. What is the reason for this change?

Accepted Answer

Because of the requirement of accessibil

Question 8

What is the minimum fire resistance rating of the shaft enclosure for a fire- escape (means- of- egress)stair?

Accepted Answer

1- hour rating for a

Question 9

An approximate formula generally used in determining the tread dimension (T)and riser dimension (R)in a stair is

Accepted Answer

A) 2T + R = 24 in. to 25 in. 
B) 2T + 2R = 24 in. to 25 in. 
C) R + T = 24 in. to 25 in. 
D) 2R + T = 24 in. to 25 in. 
E) none of the above. 
A) 2T + R = 24 in. to 25 in. 
B) 2T + 2R = 24 in. to 25 in. 
C) R + T = 24 in. to 25 in. 
D) 2R + T = 24 in. to 25 in. 
E) none of the above.

Question 10

What are the requirements for minimum width of a fire- escape (means- of- egress)stair?

Accepted Answer

It is a function of occupant l

Question 11

The minimum tread width required by building codes for a nonresidential stair is

Accepted Answer

A) 11.5 in. 
B) 12.5 in. 
C) 13.0 in. 
D) 12.0 in. 
E) 11.0 in. 
A) 11.5 in. 
B) 12.5 in. 
C) 13.0 in. 
D) 12.0 in. 
E) 11.0 in.

Question 12

What is a stringer in a steel stair made of?

Accepted Answer

A channel

Question 13

In a typical wood stair, the number of stringers required is determined by the

Accepted Answer

A) width of the stair. 
B) floor- to- floor height. 
C) thickness of the treads. 
D) spanning capacity of the carriage material. 
E) all of the above. 
A) width of the stair. 
B) floor- to- floor height. 
C) thickness of the treads. 
D) spanning capacity of the carriage material. 
E) all of the above.

Question 14

In a typical prefabricated steel stair, the stringers are cut to accommodate treads and risers.

Accepted Answer

A) True 
 B)False

Question 15

A stair constructed without risers is generally called a(n)

Accepted Answer

A) closed- riser stair. 
B) open- riser stair. 
C) hollow stair. 
D) no- riser stair. 
A) closed- riser stair. 
B) open- riser stair. 
C) hollow stair. 
D) no- riser stair.

Question 16

A stair with treads cantilevered from a central column is a(n)

Accepted Answer

A) helical stair. 
B) circular stair. 
C) spiral stair. 
D) U- shaped stair. 
E) L- shaped stair. 
A) helical stair. 
B) circular stair. 
C) spiral stair. 
D) U- shaped stair. 
E) L- shaped stair.

Question 17

A riser must be vertical. It cannot be inclined.

Accepted Answer

A) True 
 B)False

Question 18

A self- supporting cantilevered stair is supported on intermediate landings only.

Accepted Answer

A) True 
 B)False

Question 19

The minimum riser height required by building codes for a nonresidential stair is

Accepted Answer

A) 5.5 in. 
B) 4.5 in. 
C) 6.0 in. 
D) 5.0 in. 
E) 4.0 in. 
A) 5.5 in. 
B) 4.5 in. 
C) 6.0 in. 
D) 5.0 in. 
E) 4.0 in.

Question 20

A U- shaped stair has been provided between the first floor and the second floor of a building with a midlanding. This stair has

Accepted Answer

A) one flight. 
B) two flights. 
C) three flights. 
D) four flights. 
A) one flight. 
B) two flights. 
C) three flights. 
D) four flights.

Exam 35: Stairs

What are the requirements of the International Residential Code for minimum tread width (T)and riser height (R)for a single family home?

Using a sketch, explain the difference between a handrail and guardrail of a stair, and give their code- mandated heights.

A rule- of- thumb formula is used in proportioning the tread width (T)and riser height (R)of a stair. Write the formula and the rationale behind it.

Using a sketch, describe a cantilevered freestanding stair.

List the factors that determine the width of a stair.

What are the requirements of the International Building Code for minimum tread width (T)and riser height (R)of a stair?

What is the minimum fire resistance rating of the shaft enclosure for a fire- escape (means- of- egress)stair?

An approximate formula generally used in determining the tread dimension (T)and riser dimension (R)in a stair is

What are the requirements for minimum width of a fire- escape (means- of- egress)stair?

The minimum tread width required by building codes for a nonresidential stair is

What is a stringer in a steel stair made of?

In a typical wood stair, the number of stringers required is determined by the

In a typical prefabricated steel stair, the stringers are cut to accommodate treads and risers.

A stair constructed without risers is generally called a(n)

A stair with treads cantilevered from a central column is a(n)

A riser must be vertical. It cannot be inclined.

A self- supporting cantilevered stair is supported on intermediate landings only.

The minimum riser height required by building codes for a nonresidential stair is

A U- shaped stair has been provided between the first floor and the second floor of a building with a midlanding. This stair has

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