I've produced the following detailed account of one style of entirely removable heat tile. It avoids the need to rout the floor of a cage or use any tape.
A DIY Heat Tile
One of the most effective ways to use heat cord is sandwiched between a wooden base and a stone or ceramic tile, to make a
heat tile. This provides both a basking spot and the heat source for the warm end of an enclosure. Recessing the heating element of the cord into the base will hold it in position, while a thin strip of attached edging will keep the tile on top in place. It only requires about a 10 mm hole next to where the tile is to be positioned, to thread the cord’s heating element inside the enclosure. The heat tile can then be assembled (or disassembled) inside the cage.
A suitable base can be made from 16 mm MDF with 8 mm deep furrows cut into it. Starting with the first furrow about 1 cm in from the edge, cut parallel furrows across the entire width of the base. Then cut a few more at right angles across the top and bottom sections, for looping the cord from one furrow into the next. Having more than one cross furrows allows you to alter the lengths of the cord loops, which in turn will alter the temperature reached by the tile. Corflute also makes for a good base.
To work out the best spacing between furrows you should assemble the tile with the loops temporarily fixed at the chosen distance apart. I’d start at about 3 cm. Then run the heat tile in its proposed position until a stable temperature is reached. To get a more realistic result, the air gap along the edges between the base and tile top will need to be sealed e.g. using masking tape. This is to prevent warmed air from escaping, something that will not happen once the tile and base sit flush together and have a strip of edging in place.
A standard 15W reptile heat cord is 4m long, of which the last 1.5 m is heating element. This is suitable for about a 20 sq. cm area. A 25W cord has a 2.5 m heating element and is suitable for roughly a 30 sq. cm area. Heat tiles can be made in any regular shape, simply by cutting the base to the desired size and shape and then affixing thin wooden edging to it so that cut tile pieces can be dropped in and will remain in place. Slate, granite and similar natural stone tiles provide a great choice for melding into a naturalistic designed enclosure. The variety in ceramic tiles makes for easy colour coordinating.
Note: All wood used needs to be sealed to make it waterproof.
A few other things to bear in mind.
- The furrows need to be wide enough where they intersect, to allow the cord to be bent through 90 degrees without forcing it.
- The end of the cord is a few times thicker than the rest of it, so the spot where the end sits will need to be wider and deepened to accommodate this.
- Ceramic and natural stone are reasonable conductors and so spread the heat from the cord evenly by the time it gets to the surface of the tile. These tiles are also good at storing heat and as a result they take longer to warm up. The positive to this is that when a cold reptile plonks its body on them, the tiles will be able to heat up the reptile without dropping a lot in their own temperature.
- Do not use paving tiles/bricks as these generally are porous (as they contain air spaces) and are therefore not good conductors.