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CEILING, CEILING ZONE, FLOOR AND DECOMPRESSION RANGE
When in decompression, it is important that you understand the meaning of
ceiling, fl oor, and decompression range (Fig. 3.16.):
•
The ceiling is the shallowest depth where decompression could be made.
At this depth, or below, you must perform all stops.
•
The ceiling zone is the optimum decompression stop zone. It is the zone
between the minimum ceiling and 1.8 m [6 ft] below the minimum
ceiling.
•
The fl oor is the deepest depth at which the decompression stop time will
not increase. Decompression will start when you pass this depth during
your ascent.
•
The decompression range is the depth range between the ceiling and
fl oor. Within this range, decompression takes place. However, it is
important to remember that the decompression will be very slow at, or
close to, the fl oor.
The depth of the ceiling and fl oor will depend on your dive profi le. The ceiling
depth will be fairly shallow when you enter the decompression mode, but if you
remain at depth, it will move downward and the ascent time will increase. Likewise,
the fl oor and ceiling may change upwards while you are decompressing.
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