Lightweight Construction Chapter 6

Question 0

What are the 4 most common types of lightweight systems that may be encountered in private dwellings?

Answer 0

1) Lightweight parallel chord truss
2) Laminated wood I-beams
3) Metal C joists
4) Composite truss

Question 1

In private dwellings constructed with lightweight materials, when fire extends from the buildings contents to its structural components, collapse may occur within what timeframe?

Answer 1

5 to 10 minutes

Question 2

A heavy fire and smoke condition on a floor or in a cellar accompanied by little or no smoke condition on the floor or floors above May be an indication of what?

Answer 2

A concrete or gypsum floor poured over corrugated steel (Q-decking) supported by C-joists.

Question 3

What’s the primary emphasis for a lightweight building UNDER CONSTRUCTION?

Answer 3

Unless the fire is minor, or confined to a small area an exterior attack shall be primary emphasis

Question 4

The presence of smoke pushing at the floor line on the outside of a building may be an indication of what?

Answer 4

Fire in a truss loft.

*probability of collapse significantly increased

Question 5

For a structural fire in a building constructed of lightweight material the IC shall call?

Answer 5

Additional Engine

Question 6

When lightweight construction is expected the first arriving ladder company shall do what IMMEDIATELY?

Answer 6

Make an inspection hole in the ceiling from a safe area to determine type of support system.
(i.e for a fire on the second floor an inspection hole can be made in the first floor)

Question 7

When shall the rook be cut on a peaked or flat roof of a lightweight construction building?

Answer 7

Under NO circumstances

Question 8

In any building construction, the critical area subject to failure as a result of fire is?

Answer 8

The point of connection

Question 9

In areas unsupported by columns with spans of greater than ___ are generally an indication that lightweight construction is present.

Answer 9

Spans greater than 25 feet

Question 10

List general construction deficiencies found in private dwellings constructed of lightweight construction.

Answer 10

1) Inadequate fire stopping
2) Improperly installed metal gang nails
3) Inadequate bracing
4) Out of plumb structural components
5) Cracked or damaged truss components
6) Unauthorized alterations
7) Unprotected wood floor joists

Question 11

The most common type of peaked roof found in private dwellings using lightweight construction is the?

Answer 11

Open-web lightweight wood truss

Question 12

What is the weakest point of lightweight parallel chord wood truss?

Answer 12

Gang nails