Fire Roof Ventilation Cuts

Far too often when members cut a roof they make.

Fire roof ventilation cuts.

If the roof decking is intact locate a natural vent in the roof such as scuttle skylight or vents. This venting might suffice for the interior forces to find the fire and extinguish it. A common time frame established for failure of a lightweight truss is between 5 and 15 minutes under fire conditions not much time for fire departments to operate within to cut a hole for vertical. Vertical ventilation is the removal of super heated air gases smoke and pressure inside a closed or vent.

The technique of horizontal or lateral ventilation involves the. This will allow ventilation without having to cut the roof. Ventilate openings in the roof such as bulkheads skylights or scuttles. A trench is cut after the main ventilation hole is cut and extended and inspection holes are made to monitor extension in the cockloft.

If necessary cut the roof to provide vertical ventilation. A trench is cut at least 20 feet from the main vent hole and. If it is decided that a vent hole is to be cut coordinate a location of the cut with the interior fire attack. The same techniques can be used on a slight pitched peaked roof as well.

Move back to the first outside rafter and cut a parallel. Once the location is agreed on prepare for your cut. And depending on what the fire conditions are it may literally be the only option. In this article we ll talk about a ground ladder based roof operation on a peaked roof.

The 7 9 8 ventilation cut provides a preset plan for conducting a cut. The cut is the easy part tools of the ventilation trade. Glendale fire department ventilation training manual.