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What Do You Use to Practice Roof Ventilation?
Replies to This Discussion
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Permalink Reply by James Hawk on
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in my nys ff1 course we used plywood screwed onto pallets
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Permalink Reply by Jack/dt on
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Hopefully you're going to have someone up on the roof that knows what their doing so really, it's nothing more than gaining practice/experience with the saw(s). But, since you only want to be cutting through the sheathing and not the joists (if you don't know why this is you probably shouldn't be up there in the first place) I would suggest rather than pallets knock up some 2 x 10's (keeps the blade away from the ground/pavement) in a 4 x 8 box with joists 16" oc in between and then screw down some ply. It will give the ff the chance to practice cutting and feeling/letting the saw ride up over the joists.
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Permalink Reply by Royce Terry on
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Great ways guys. I've seen some fire dept that have like a shed sort of structure and they have holes that are pre cut and then slide the plywood over the holes. But then your only cutting regular wood and not getting the feeling of the joists. Jack/dt love the idea of putting some sort of wood underneath so you can feel the saw ride over the joists.
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Permalink Reply by John Crabbe on
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I've seen some fire dept that have like a shed sort of structure and they have holes that are pre cut and then slide the plywood over the holes.
That is what the tech college has and we can do some training with those. They are a roof mock up with different pitches and the plywood is placed on top of joists, so there is that feel of them when cutting. Anytime a house or building is available, take advantage because it gives a different feel with the shingles, etc on top as well.
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Permalink Reply by Doug Ayers on
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How did you build your prop? We are a small dept and it is difficult to get off station training because we need to be available for medical runs. Any training suggestions would be appreciated. d-ayers@live.com
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Permalink Reply by barka on
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'Tactical Ventilation
Deliberate act by Fire Service to open up building/compartment to release products of combustion
Can be used in three stages of firefighting:
*After arrival of Fire service but before control achieved
* After control but before extinguishment
* After extinguishment.
Benefits as a firefighting tactic
Can assist escape of occupants by restricting smoke/fire spread
Can aid rescue operations by reducing smoke & toxic gases
Can improve firefighter safety by reducing risk of flashover or backdraught
Can aid firefighting operations - removing heat/smoke allowing earlier entry and easier fire location
Can reduce damage to property
Safeguards
Must be part of an overall firefighting strategy
Must not be commenced until likely effects assessed and proper safety measures put in place, i.e. covering jets/sprays
Techniques - 'Vertical' or 'Top' ventilation
openings made at high level (usually roof)
Buoyancy of hot gases and smoke enables them to escape upwards
Ventilation - basic principles
Wherever possible hot gases released from high in compartment, fresh air in at low level
Opening should be of similar size
High vent downwind, low vent upwind to take advantage of natural air flow
High vent MUST be made before low vent
Covering jets in place before ventilation takes place
Ventilation - basic principles
Hot gases escaping from vents can be cooled to prevent ignition
Sprays & fogs are more effective than jets
Water should not be directed in through the hot gas vent as this may prevent gases escaping and/or drive in fresh air - possible backdraught!!
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Permalink Reply by walmart on
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they have some high pitch ones too. Last time I was at the gb one they had 3 diffrent ones. THat was about 3 years ago for ff1. We havea half roof that sits on the ground. Its shingled except where we are going to be cutting. It's actually a really good tool. I will try to get pictures for the others
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Permalink Reply by Firemedic Rob on
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Like others, we start with a prop on the ground to work on the basics. Plywood/OSB over a few pallets.
We have a large prop on the roof of the hall one of the guys made the frame work out of steel. You put your own joists in and slide on the plywood/OSB that fits into tabs that hold it in place. As they get more comfortable we add the ladder work. This can also be used with the Aerial for working off the stick.
I have some turbine roof vents and an old skylight that can be added as well. Doesn't look pretty, but it's effective.
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Permalink Reply by Robert Owens on
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We practice it alot....we built a roof simulator at my station and we can either put in on the hill to simulate a pitched roof, or leave it on the ground to practice a flat roof cut.
We typically utilize the "basket cut" when venting a roof unless a parapet is present then we will do a thourough risk assesment of building integrity then decide wether or not the roof is going to be cut....
In my opinion risk assesment is were any training program must begin....Knowing when or when not to cut is far more important than knowing how. Roof ventilation at least in my FD is a dying breed with lightweight construction, ladder fuels, and attic construction.
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