Roof Construction

Question 1

Where does conventional construction get its strength from?

Answer 1

Size of the members

Question 2

Where does lightweight construction get its strength from?

Answer 2

The amount of members working compression and tension with each other.

Question 3

An accurate estimate of a structurally strong building is dependent on what factors?

Answer 3

1.Type of construction
2.How long the fire has been burning for
3.Fire intensity

Question 4

What are the different roof styles?

Answer 4

1. Gable
2. Hip
3. Flat
4. Bridge truss
5. Arch: bowstring, lamela, tied truss
6. Sawtooth

Question 5

Conventional gable roof rafter size and spacing

Answer 5

Rafter:2x4
Spacing:16-24in, up to 36in on steep pitch

Question 6

Lightweight gable roof rafter size and spacing?

Answer 6

Rafters: 2x3 or 2x4
Spacing: 16-24in

Question 7

What’s the most common metal gusset plate size?

Answer 7

18 gauge 3/8th depth

Question 8

Conventional Gable roof frame configuration?

Answer 8

Ridge board- 1x6
Rafters 2x6
Collar beam
Ceiling joist
Top plates
Stud

Question 9

Lightweight gable roof frame construction?

Answer 9

Top chord- compression
Roofing material
Plywood
Metal gusset plate
Webbing
Bottom chord-tension

Question 10

Hazards of lightweight gable roofs?

Answer 10

smaller members, plywood, metal gusset plate fail quickly.