Okay,
@BY Bob , you asked for it...it will be a long post:
How I make a cardboard sleeve for my heated bricks:
Items required: Duct tape, scissors, brick, & corrugated cardboard box
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Remove packing tape & open box up:
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I like to use the small 'flap' of cardboard that held the box together as my overlap (seen above on the far left)
Lay brick against that crease, then 'roll/flip' brick to determine where to cut the cardboard. Note: make it just a hair bigger, so it isn't too tight.
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Notice above I scored the box where I need to cut (both for reference and makes cutting easier) You could also use a sharpie to draw the 'cut' line.
Now I determine the length needed, and cut the flap that I will fold in to close the sleeve when completed:
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Hard to tell in the pic above, but I folded it over...note I'm using a natural crease for ease.
Next I trim the ends of the flap so it will slide into the box when the brick is inserted:
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Next, trim at the bottom end so there is enough of a flap to tape up/seal/cover the bottom end of the brick: Here I scored again where I needed to cut. Notice the longer peice at the back - that will be the flap that covers the bottom of the brick.
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Now that it is cut to size, fold around brick. (Again, be sure it isn't tight, or brick won't slide in/out easily)
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now that it is in place, tape up the long side:
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Then tape up bottom flap:
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Now fold and tuck top flap closed:
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'Box' closed:
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Leave it like this once hot brick is inserted.
Then, later when brick has cooled, just open and remove brick for reheating:
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The cardboard helps the brick release heat slowly, as it is a decent insulator. It also keeps the chickens from burning their feet if they step on it. Plus, protects the brick from the inevitable poop....so it can be reheated without having to wash it each time.
Hope this is clearer than mud.