Wood truss roofs fail
Without warning
The most common type of roof on taxpayers
Wood joist covered by tongue and groove boards or plywood
Failure of one truss element can cause
Failure of the entire truss. Failure can occur in the early stages of the fire
Unprotected open web steel joists are particularly vulnerable to elevated temperatures and may collapse after only
5 or 10 minutes
Transmit a 2nd alarm for a taxpayer fire in these situations
Store fire with extension to cockloft
Store fire with extension to adjoining occupancy
Advanced cellar fire
Taxpayer fires that need “extra engine and truck”
Advanced store fire with 2 lines operating
The last resort strategy at a taxpayer cellar fire is
Flooding the 1st floor with a Stang nozzle or tower ladder pipe
What engine company has to insure the the sprinkler system is supplied at taxpayer cellar fires
3rd Engine (recent new change)
At a store or cockloft fire what engine is responsible to insure that the sprinkler system is supplied
3rd engine
Under the 1968 building code the maximum permitted area for an unsprinklered building is
7500 square feet
If the building was sprinklered then the square footage is unlimited
Concealed roof spaces need to be cut into areas not exceeding 3000 square feet unless it was sprinklered
Updated calculations have revealed that bowstring truss roofs may only support _______ % of the load they were originally designed to hold
40%
Another common bowstring truss sped sign flaw involves snow loads. Early building codes assumed snow accumulations of uniformed depth. In reality, snow that drifts due to wind can be significantly deeper in one area, particularly
Behind raised parapet walls. This eccentric (off center) unbalanced, concentrated load can create an overload on the trusses
The most common type of flooring in a taxpayer
Tongue and groove boards or plywood
Under NO circumstances shall any member operate on the roof of any building involved in a content or structural fire with a
Wooden, metal or combination bowstring truss design
Before lines are operated initial the roof all interior operations must cease or personnel withdrawn to a safe area. It must be remembered that the primary purpose of roof lines is to
Protect members operating on the roof and prevent fire extension to exposures
In must be remembers that in a high heat condition, combustible gases and highly heated contents are now present in the structure. All that is missing is a source of air or oxygen to create an explosive fire. A room or fire area requires only _____% of its space to contain the explosive mixture for the entire area to possibly explode
25%
New Change
What unit is responsible for ensuring the sprinkler system is supplied at a taxpayer CELLAR fire
3rd Engine
Same engine as in a store/cockloft fire
True or False
The roof sector supervisor can start a trench cut only after approval by the IC
False
You can start the trench without approval 1st but you must notify the IC that a trench has been started
2nd alarm situations at Taxpayer fires
- Extension to cockloft
- Extension to adjoining
- Advanced cellar fire
When do you special call a TL
Only if one is not assigned on the initial alarm AND its use is anticipated
