Chapter 17 Roof Ventilation Techniques for Conventional and Lightweight Construction Flashcards
What are the two primary goals of ventilation operations?
Reduction or removal of contaminants and the control of fire spread
Why is it important to determine the age of a roof?
The thickness of the decking material and the construction of the roof.
Why should roof ventilation personnel determine the direction of the structural members?
To allow personnel the ability to cut with the construction and to complete the cuts so that the decking material to be removed is attached to one structural member.
In roof decking, what is the dfference between the base and the covering?
The base is the material attached to the structural members, and the convering is the material on top of the base
What is a head cut?
A cut through roof decking that is perpendicular to the direction of the rafters and involves rolling the rafters
How many cuts are normally required to remove plywood-type materials?
four
What is a primary advantage of louvering decking materials?
The ability of personnel to hinge the decking material on a single structual member and levering the decking material against itself.
What is the primary thing to evaluate before initiating any ventilation operation?
Feasibility of a ventilation operation
Name four ventilation safety considerations when metal deck roofs are exposed to fire?
quick failure rate with minimal warning
the ability to propagate fire between the metal base and the composition
it demands specific ventilation techniques
and it can be a time-intensive operation
Name three important operational and safety considerations when performing strip ventilation operations.
Timing,
Distance for time,
and coordination of interior attack operations
What is Systematic procedures concerning ventilation?
That ventilation operations are most effective when they are based on a specific purpse or intent–Not randomly used—SOP based
Training + experience + prefire planning = ___
SOPs
What is a basic rule of thumb when approximating the age of a roof and roof thickness?
One layer of composition ashalt shingles for every eight to ten years of age
Concerning Axe bounce, when will the axe bounce when striking wood sheathing?
It will bounce when striking against the wood grain
When a ceiling is present, roof ventilation operations are not complete until what is done?
The ceiling is opened to create a pathway from the contaminated area to the vent in the roof
