OPERATION & MAINTENANCE / 19
Fig. 19. Pull up and over the rafter ...
VENTILATION CUTS
There are many types of ventilation cuts. We will demon-
strate some of them for your reference. For more informa-
tion about the principles and techniques of ventilation,
please refer to the Cutters Edge Training Video and its
supplemental manual.
We also recommend the book
"VENTILATION METHODS AND TECHNIQUES" by Bat-
talion Chief John Mittendorf. Order forms are in the back
of this manual.
INSPECTION CUT
The 45 Degree Inspection Cut - or View Hole - is a
triangular cut through the roof decking and rolled over one
rafter at 45 degrees to any exterior wall (Figs. 22A & 22B).
This cut allows you to identify the type of smoke and the
roof composition, and to determine rafter direction.
Fig. 22A. Inspection Cut
Fig. 20.... plunging back in on the other side.
Criss-cross your cuts at their intersections. The overlap-
ping of your cuts will allow for easy removal or louvering of
the roof material (Fig. 21).
Fig. 21. Criss-cross, or overlap, your cuts.
Fig. 228. Inspection Cut.