I use the AP probe slots with flexwatt as well, but I still like to use plywood to create a 1/2" space between cages; in the unlikely event that a thermostat goes haywire or gets turned up too high, a small gap could mean the difference between life and death for my animals...Originally Posted by The Serpent Merchant
I currently have 4 AP T8's and an AP T12 stacked together with flexwatt heating all of them... there is 0 gap in-between them but the thermostat probe is attached directly to the flexwatt (AP routes a slot for Thermostat Probes in the bottom of the cages) They have been set up this way for months without any issues at all.
The reason for the gap is to prevent heat build up. But if your thermostat probe is attached directly to the UTH, any heat built up will be detected and power going to the UTh will be reduced, preventing heat buildup. In cages set up with the thermostat probe (or no thermostat) not attached to the UTH, then I agree that an air gap should be used.
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