PD Lightweight Flashcards
What’s the most common type peaked roof found in LW construction ?
Open web LW wood truss
Are floors in LW construction as substantial as found in ordinary construction ?
No
Nyc bldg code requires LW constructed spaces between the ceiling and the floor above or the ceiling and roof above to be divided into approximately equal areas of_______ sq ft or less or has to have a sprinkler.
500 sq ft
What is the weakest point of a lightweight pararell chord wood truss?
Gusset plates or gang nails
Which only go into wood 1/4 to 1/2
In a traditional PD with a finished ceilings what’s the time of collapse?
Collapse occurs in 1 hour
When LW pd’s Structure are involved in fire how long into collapse can occur?
5-10 minutes
Is early collapse a issue in traditional PDS
No
How long in traditional pd’s with no ceiling can collapse occur?
20 minutes
What is the primary consideration at LWPD’S
Collapse
At LWPDS what is of paramount importance?
Positioning the first Hoseline for early extinguishment
How many foot span without columns would indicate LW construction
Spans greater than 25 ft
At LWPDS what is the most important factor to a safe and successful operation ?
Identify the presence of LW construction
What are some indications that you have a cellar fire in a PD?
High heat no fire on first floor Smoke from chimneys especially in warmer months Smoke from first floor baseboards Hot floor boards Smoke coming out of eves
When could we operate a line into a cellar window at a PD cellar fire?
Serious advanced fire Can't advance down the stairs Unable to find the cellar entrance Lightweight construction Emergency members trapped. SCULE
If we are going to operate a line into a cellar window at a PD what do members operating on the first floor have to do?
Either have a line there to protect them on first floor or exit the bldg
At a cellar fire in a PD where does the first line get stretched to?
1st line goes to the cellar via easiest accses
If the first line at a PD cellar fire goes into the main entrance who can order the line moved to a different entrance to access the cellar?
A ABC or chief can order this and there can’t be another hose line on scene
If the first line at a pd cellar fire in going to be moved to a secondary entrance to the cellar what do members on the first floor have to do?
Have to withdraw
If the first line in a pd cellar fire is going to be moved to go to a secondary entrance to the cellar what do members on the second floor have to do?
Have to have a secondary means of egress.( portable ladders)
If you pull up and have a fully involved PD what should you stretch?
A 2 1/2 line
If you had a LW wood parrell chord truss in a PD you should know this creates what?
A truss loft
What does cold formed steel fail at?
800 degrees
What does structural steel fail at?
1100 degrees
How much strength does structural steel loose at 1100 degrees?
40 percent
When does cast iron fail?
1100 degrees
At 1100 degrees how much strength is lost with cast iron ?
58 percent and not regained
If you had Q decking with concrete or gypsum on the floor boards what is this a sign of?
Heavy dead load
When light weight construction is suspected where should you immediately inspect?
The ceiling
What’s the primary attack on a LW PD under construction ?
Exterior attack
When using the thermal imaging camera at a PD it will not be able to detect anything through?
Double 5/8 plaster board
If you pull up to a fire in a Pd and have smoke pushing out the floor line what does this indicate to you?
A truss loft which= LW construction which= collapse
If you have light weight construction at a PD fire what do you need to call for?
A extra engine
If we can’t knock down a fire in a LW pd with _____ lines we should go to outside opps.
2 lines
Can we cut flat or peaked roofs in a LW pd ?
No never
Can we operate on a LW pd roof?
Yes as long fire has not gotten into the cockloft
What can we do on the roof of a LW pd?
Vent top floor windows and skylights
Check sides and rear
Check HVAC system
At a pd fire before going above the fire what must you know?
Position and progress of first and second line
Location and extent of fire
Known or Suspected life hazard
What type of condition in a pd must be communicated to the IC ?
Collier mansion
If a pd is being built with LW construction what phases are we suppose to inspect them?
Framing
HVAC
Plaster board
Also suppose to conduct drills
