Trench Cut Roof Ventilation

In the 800 block of fairview avenue at the kenwood apartments in arcadia california.

Trench cut roof ventilation.

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. 2 observation cuts between fire area and determined trench location. 0bdecking decking is the material used to comprise the base and exterior covering for the roof.

The 7 9 8 ventilation cut provides a preset plan for conducting a cut. Center rafter can also be used for cutting strip ventilation on 1 x 4 or 1 x 6 sheathed roofs. The base is the material attached to the roof rafters. This video gives detailed instructions on how where and why to ventilate a flat roof including how and why to make trench cuts.

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. The base material can consist of solid wood. Cut trench at narrow point and pull ceiling but do not pull trench. Large vent h over fire area.

Position hose lines underneath and above. Open the trench and operate hoselines. A trench is cut at least 20 feet from the main vent hole and. 5 when fire shows from observation cuts.