Privat Dwelling/Chapter 6...Lightweight construction Flashcards
In any building construction, the critical area subject to failure as a result of fire is the…?
POINT OF CONNECTION
For fires in TRADITIONAL PD’S, built of ordinary wood/frame construction…?
early collapse is NOT A PRIMARY CONSIDERATION
- collapse time/1 hours
- no ceiling -20 minutes
In PD’S CONSTRUCTED of LIGHT WEIGHT materials, when fire extends from the building contents to its structural components, collapse may occur..?
within 5 to 10 MINUTES
COLLAPSE IS ALWAYS THE PRIMARY CONSIDERATION IN BUILDINGS CONSTRUCTED WITH LIGHTWEIGHT MATERIALS
Paramount importance..?
positioning the 1st hoseline for early extinguishment or control of CONTENTS FIRE THAT HAS NOT EXTENDED TO THE STRUCTURAL COMPONENTS IS OF PARAMOUNT IMPORTANCE
2nd line- MUST be positioned to back up the 1st line…(exception: 2nd line NEEDED to address LIFE HAZARD OR DIRECTED BY IC to another location)…then 3rd LINE must be positioned as back up
Areas_____by columns with spans greater than______are generally an indication that lightweight construction is present?
UNSUPPORTED
25 FEET
Most important factor to a safe and successful operation at these types of buildings is…?
the IDENTIFICATION of the presence of lightweight construction
-ANY MEMBER becoming aware of lightweight construction must NOTIFY THE IC
Lightweight construction and ECIDS?
MANDATORY
EXTERIOR WALLS?
heavy type of exterior finishing (stone or brick veneer)may be anchored to the structure with metal straps or wire mesh. these walls may potentially fail as one complete unit when exposed to fire and high heat
Trussloft?
enclosed area between floors and ceiling where open truss construction is found
Heavy Fire and smoke condition on FLOOR OR IN CELLAR accompanied by little or no smoke condition on the floor or floors above may be an indication?
CONCRETE or GYPSUM FLOOR POURED over CORRUGATED STEEL (Q DECKING) supported by C JOISTS ..
-This DEAD load can lead to early floor collapse
The ____shall ensure that all members on the scene are made aware of the presence of lightweight construction?
INCIDENT COMMANDER
-this info should bet transmitted to borough dispatcher in the preliminary/progress reports
ONCE the fire enters the concealed space containing lightweight trusses or joists , it can rapidly travel to remote locations.
The IC shall IMMEDIATELY BE NOTIFIED..ALL MEMBERS shall be directed NOT to enter fire area or areas directly above the fire until the IC determines the risk of a planned coordinated interior attack…especially true for OPEN-WEB design of LIGHTWEIGHT PARALLEL CHORD WOOD AND COMPOSITE TRUSSES
Presence of SMOKE PUSHING at the FLOOR line on the outside of a building may be an indication of FIRE IN TRUSSLOFT…
probability of collapse significantly INCREASED
During Overhaul:
- minimum number of FF’s
- any floor or roof support system that has been HEAVILY damaged DUE TO FIRE should be HYDRAULically overhauled from SAFE AREA using reach of stream
- members should NOT operate directly above or below the STRUCTURALLY DAMAGED AREA, INCLUDING THE ENTIRE LENGTH OF JOIST
IC SHALL special call an additional_____for fire in a lightweight PD?
ENGINE
WHAT IF FIRE CANNOT be QUICKLY knocked down with 2 HOSELINES?
OUTSIDE ops MUST BE CONSIDERED
-operating personnel inside building must be limited so that quick egress is not impeded
NOZZLE FF’s should use _______?
LEG FORWARD METHOD
- Engine FF’s should NOT BUNCH UP
- only minimum FFs used
-when spacing is 24” or more on lightweight floor, engine members moving in to immediate fire area may PLUNGE through floor deck and create larger openings (use above methods to avoid this)
When lightweight construction is SUSPECTED , the 1st arriving ladder company shall make an inspection hole in the ceiling from a SAFE AREA in order to determine the type of support system present (EXAMPLE: FIRE ON 2ND FLOOR, inspection made on FIRST FLOOR)…
THIS CRITICAL TASK should be done IMMEDIATELY UPON ARRIVAL
-if fire is in CELLAR/1ST floor and conditions prevent visual ID of the type of construction…exam made in SIMILAR ATTACHED EXPOSURE …this shall be ASSIGNED BY INCIDENT COMMANDER
Before entering any room that was involved in fire , ONE or MORE inspection holes shall be made in the ceiling to check for fire extension…
the LCO shall ensure a CHARGED LINE is in position before any additional opening are made
When can we cut a roof in building of LIGHTWEIGHT CONSTRUCTION?
-UNDER NO CIRCUMSTANCES, shall any peaked or flat roof building with lightweight construction be cut
When the fire is so severe that any additIonal ventilation would necessitate the roof to be cut, the IC SHOULD ?
CONSIDER EXTERIOR ATTACK (CANNOT CUT ROOF) (different from BOWSTRING Truss—cannot Operate on )
Fire conditions will dictate the feasibility of ?
ROOF OPS….continually evaluate risk vs reward
-in order to relieve conditions on upper floors, TOP FLOOR WINDOW can be vented
Fire is on TOP FLOOR and CLEAR INDICATION that Fire has NOT entered cockloft :
Roof operations:
- check rear and sides of building
- Vent top floor windows, and skylights
- inspect HVAC dust vents for unusual heat
*all members removed from roof upon completion of these duties *
Fire on Top Floor..indication that it has extended to attic/COCKLOFT :
IC immediately notified and members SHALL NOT BE PERMITTED TO OPERATE ON THE ROOF
