This video gives detailed instructions on how where and why to ventilate a flat roof including how and why to make trench cuts.
Trench cut roof ventilation.
Large vent h over fire area.
The 7 9 8 ventilation cut provides a preset plan for conducting a cut.
Ventilation flat roof operations 2.
Cut trench at narrow point and pull ceiling but do not pull trench.
A trench is cut at least 20 feet from the main vent hole and.
A structure fire was reported at around 6 a m.
The trench cut otherwise known as strip ventilation is a long narrow ventilation hole that acts as a fire break on the roof of a structure that is being attacked by fire.
5 when fire shows from observation cuts.
Open the trench and operate hoselines.
The base is the material attached to the roof rafters.
Position hose lines underneath and above.
Center rafter can also be used for cutting strip ventilation on 1 x 4 or 1 x 6 sheathed roofs.
A trench is cut after the main ventilation hole is cut and extended and inspection holes are made to monitor extension in the cockloft.
The base material can consist of solid wood.
In the 800 block of fairview avenue at the kenwood apartments in arcadia california.
The same techniques can be used on a slight pitched peaked roof as well.