Ch. 11 Lightweight wood truss collapse

Question 1

Light weight wood truss systems use wood members as small as how many inches?

Answer 1

2X4 inches

Question 2

Lightweight wood truss systems are connected by sheet metal surface fasteners. These gusset plates or gang nails are critical to the integrity of a truss during a fire. These lightweight trusses may collapse after how many minutes in a fully developed fire?

Answer 2

10 minutes

Question 3

The sheet metal fastener has many V shaped points punched thru it. The V shaped nailing points fasten only the surface of the 2X4 inch wood truss. The V shaped points penetrate the wood surface to a depth of?

Answer 3

1/4-1/2 inch

Question 4

Because of the severe hazards associated with truss construction NY has a law requiring how many lines in what direction to identify truss construction?

Answer 4

Two (2) Vertical lines

Question 5

The rate of fire spread inside a bldg.’s concealed space that utilizes parallel chord lightweight construction will be how much faster than in a concealed spaces of a bldg. with conventional solid wood beam construction?

Answer 5

100% faster

Question 6

The recommended strategy for fighting a fire in a bldg. with a lightweight wood truss roof or floor:
If fire is burning content such as a couch or mattress, we shall operate how?

Answer 6

Stretch an interior hose line and extinguish the fire.

Question 7

The recommended strategy for fighting a fire in a bldg. with a lightweight wood truss roof or floor:
If fire involves the structure and is burning thruout
the concealed roof or floor spaces we shall operate how?

Answer 7

The occupants should be removed and an exterior attack should be used.