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Look that:
http://www.youtube.com/watch?v=_BeEG9LEzjU
Boston Fire I think..
Vertical ventilation does work, if this really needed. If don't, you waste time and threat the firefighter with roof collapse.
For other hand, look the windows on any structural fire, and you can see the upper third of the window full with smoke, so if you cut a h*** right up that smoke, anything go out from the windows, making better conditions to firefighting interior opration, any people trapped inside.
-Esteban, this is indeed an interesting video though I'm not sure where the video was shot. It is most certainly not the city of Boston, Massachusetts.
-Given the fire conditions showing and the condition of the structure I believe that roof operations are not necessary and are needlessly endangering to firefighters in this particular operation.
-If roof operations are to take place than there must be multiple ladders raised so members have secondary methods of escape should conditions change.
-One point many firefighters and commanders overlook is just how quickly safe roof operations must be conducted in order to get members off the roof that much sooner.
Esteban Andrés Cabrera Rebolledo said:Look that:
http://www.youtube.com/watch?v=_BeEG9LEzjU
Boston Fire I think..
Vertical ventilation does work, if this really needed. If don't, you waste time and threat the firefighter with roof collapse.
For other hand, look the windows on any structural fire, and you can see the upper third of the window full with smoke, so if you cut a h*** right up that smoke, anything go out from the windows, making better conditions to firefighting interior opration, any people trapped inside.
yes vertical ventilation does work. At my department we don't vent all that much or see that much fire for that matter. but we do train on it all the time. We have deen going away from the recuit school method of doing a 4 x 4 cut and started teaching a 4 x 8 aka "trench cut" there are some good video's on youtube of the trench cut method I also think there is one on the training min called 7, 9, 8 cut also.
hope this helps.
-Jacob, as a matter of technical correctness the 4x8 foot ventilation h*** is not a trench cut, its just a big vent h*** measuring 4x8 feet. This is not minutia; rather it is a technical point of fact and in order to better understand the mission the proper terminology should be used. Is the roof team directed to cut a vent h***, extend a vent opening, cut a trench? Will they make a three cut, knock out inspection h*** or use curf cuts to assess roof conditions?
-By definition, a trench cut is a ventilation h*** in a roof the extends from exterior wall to exterior wall. For example, a trench cut on a taxpayer roof would be 4 feet wide and 50 feet long. That means at the very least, 108 linear feet of cutting. More cutting if you factor in that a lateral cut will be need every eight feet in order to facilitate pulling from the roof team. Thats a total of 133 linear feet of cutting.
-To achieve this cut in a timely fashion so as to be definitive would require four saws operating simultaneously and will typically take more than ten minutes to accomplish.
-That being said, a trench cut is not a technique to be used on a taxpayer, despite the prevalence of the tactic in relation to fires in taxpayers. The reason being id that it takes far to long to achieve and exposes the eight man (at a minimum to achieve this amount of cutting and pulling) roof crew beyond a safe time limit. Remember, if the trench is being considered than the structure on the fire side is being written off. In a poorly constructed taxpayer, that is a dangerous amount of fire exposure to the roof supporting framework.
-In fact, the trench cut was designed to address fire in a very particular type of building; the H style building. In this type of structure, the building itself creates a natural narrowing of the structure, a choke point in which a trench cut will facilitate complete traversing of the roof surface. This narrowing of the roof surface, usually a hallway connecting the two larger portions of the building, is the proper location to cut a trench.
-Following this, in order to properly use the trench technique, the roof must provide a narrowing area in which to cut the trench. Everything on the fire side of the trench is understood to be written off; the trench is where firefighters make their stand. The narrowing part of the building allows for more aggressive firefighting as there is less structural involvement and a complete wall to wall roof vent h***.
-True trench cuts are very time consuming, labor intensive operations employed only when the structure provides a narrowing choke point in a fire scenario in which a large portion of the fire building is being written off.
Jacob Smith said:yes vertical ventilation does work. At my department we don't vent all that much or see that much fire for that matter. but we do train on it all the time. We have deen going away from the recuit school method of doing a 4 x 4 cut and started teaching a 4 x 8 aka "trench cut" there are some good video's on youtube of the trench cut method I also think there is one on the training min called 7, 9, 8 cut also.
hope this helps.
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