Tue, 25 Jan 2011|
Paul Dasbach discusses firefighting hazards and concerns at a commercial buidling that is part ordinary construction but with a storage space of steel truss construction.
Automatically Generated Transcript (may not be 100% accurate)
Hello and welcome to fire engineering. Training minutes. My name is Paul -- back and in this session we're gonna talk about a building that most fire departments we'll have in your jurisdiction. The subject of today's training minute session is there one story building of ordinary construction. Well. Actually it's gonna be hybrid construction and you'll understand why as we get into the video. The front part of the building which is the customer area of the building as it would raptor roof and exterior -- -- walls. The back part of the building which is primarily used as a storage space for the mercantile occupancy. Has a steel frame. -- -- -- -- inside and take a look at the features of that trusts at some of the construction features of the building. They were inside were to take a look at some of the conditions of the structure and some of the features of the structure that are going to be concerns for the far serves. First thing we noticed is that we have a wide open water area again the lack of interior columns. Tells us that the buildings and trust. This space the space created by the truss roof portion of the building is approximately sixty feet by 75 feet -- Actual notice looking up. Towards the trusses. Atrocities are a steel frame trusts the top court and the bottom quarter of the steel frame trucks are parallel. From the exterior structure that's going to give the appearance that this building has -- flat roof. When in fact. The structure of the roof is a steel frame -- -- one of our previous videos we -- structure that was vacant. And that was obvious by the wide open more areas in the absence of stock imperial this building is an occupied structure. And the stock and material is what creates the -- what. Fire in this occupancy. Will affect the trusses almost immediately which you'll begin it will absorb the heat and -- heated. As the steel -- heated as the fire continues once the steel reaches its you'll point the -- will begin to fail. As we observe from the -- through the building the building has -- over her garage door. The size of the building sixty feet by 75 feet may lend itself to interior firefighting while at least firefighting from the overhead door. Incident commanders must make decisions based upon location and the extent of the fire as to whether or not to commit firefighting resources. Into the building were in for the collapse -- Application of a heavy caliber hosiery with good reaching penetration. Is possible. We have no ceiling in -- occupancy. That's going to obstruct the holy shrines and hose streams can be directed. Up to into the trust base -- was steel and prevent failure of the trusses. As we look across the building we -- -- safe storage law is built into one into the trusses. The -- -- is open and accessible to the war blog. This will allow application of a hose stream from the war below or from the open -- -- door. A stairway. From another part of the building also provides access to the storage -- Crews must make the decision what is the most efficient way of apply extreme to a fire historic -- Do we applied -- stream from the war blog we have direct access because there are no construction. Features walls or ceilings obstructing a trust law. Or do we attempt to stretch the line -- a narrow stairway and -- line service from the trust law. We're gonna take a look at that narrow stairway and then you can decide for yourself which is the most efficient and safe way -- industry. As we've discussed there's a stairway -- that leads up to the storage lost in the trust area. This is the stairway -- stairways accessible from another part of the bill. Which fairways narrow. -- will require the crew could make -- ninety degree turn. Access and apply the hose stream up into the trust law. That's stretch is going to be difficult stretch using a two and a half -- hose line. Once -- crew reached the top of the stairway they're gonna need to make it ninety degree left hand turn. To operate the -- -- opened the -- -- again. You're gonna need to make the decision which is the easier safer and more efficient -- threat stretching up -- narrow stairway having to -- the line. Or applying a hose stream from down -- On the floor area. Up on the roof we notice there are some skylights. The -- provide an opportunity for some quick ventilation. -- -- skylights will relieve the heat and products of combustion from inside the structure. Another feature of the roof is that the -- is basically flat. Remember we described the steel trusses as -- parallel court. The absence of a peak or borrow on this roof. They leave firefighters to believe that this is not a truss roof. Prior knowledge. Pre planning. And building intelligence. Will help provide firefighters with the necessary information to understand the buildings within their jurisdiction. In this section are -- -- we looked at a building that contained a steel frame truss roof. The top court in the bottom -- or parallel. Giving the appearance that the roof may in fact be -- flat roof of wood joists. Be aware that there are many different types and forms of trust is out there. All forms of trusses create some significant and unique firefighting challenges and hazards. Firefighters must recognize walled buildings and structures that -- trust -- and fight the fires are safe and efficient -- Thanks for watching this section of violation hearings training --