Fire Roof Ventilation Cuts

Vertical ventilation is the removal of super heated air gases smoke and pressure inside a closed or vent.

Fire roof ventilation cuts.

This will allow ventilation without having to cut the roof. Far too often when members cut a roof they make. The same techniques can be used on a slight pitched peaked roof as well. 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 it is decided that a vent hole is to be cut coordinate a location of the cut with the interior fire attack. 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. In this article we ll talk about a ground ladder based roof operation on a peaked roof. Once the location is agreed on prepare for your cut.

Roll the second center rafter and stop at the third inside rafter. The 7 9 8 ventilation cut provides a preset plan for conducting a cut. The technique of horizontal or lateral ventilation involves the. This venting might suffice for the interior forces to find the fire and extinguish it.

A trench is cut at least 20 feet from the main vent hole and. Cut approximately 2 to 3 inches inside the rafter. If the roof decking is intact locate a natural vent in the roof such as scuttle skylight or vents. We ve assembled the gear and now need to get it to the building in one trip.

And depending on what the fire conditions are it may literally be the only option. Ventilate openings in the roof such as bulkheads skylights or scuttles. Glendale fire department ventilation training manual.