I am considering using like heat tape, instead of lights, so the cages could rest on each other with the heat tape in between. My question is is it safe to put the heat tape in between wood, will the heat get through the wood, even if it was 1/2 or 3/4 in?
This can be easily done. I'll repeat a design I have often suggested to many people.
Cut a rectangle out of the floor of each cage. Make it 2" longer and wider than the size of heat tape you anticipate using.
The cover the entire floor with a piece of expanded PVC, also known as Sintra. This happens to be the same material Jungle Habitats uses for their cages.
Then use foil tape to attach the heat tape directly to underside of the floor.
Route a small groove for the cord to run out of the back.
This improves the cage in many ways.
1) It makes the floor much more durable and moisture resistant. This is nice since it's the part of the cage that gets the most abuse.
2) It makes the floor easier to clean. This is nice for the same reasons in #1.
3) The foamed interior of Sintra makes it very heat conductive which means a more natural thermal gradiant will be acheived.
4) It increases the thermal mass.
5) It makes the cage safer due to the air space.
6) It also makes the cage lighter.
Another option is to skip the wood floor altogether and just staple a piece of Sintra to the bottom rim of the cage. This really saves weight. It's plenty strong since the plastic floor will be supported by the top of the cage below.
For the bottom most cage simple make a platform with casters for the cage to rest on.
Some people are not comfortable with not having the structure of a wooden floor. This is not a big deal, it's little different from having a thin luan back like you so often see. I have seen it used in cages up to 8' long.
What do you suggest i do with the rest of it, is contact papper an option for the walls? or some kind of paint or coating.
Really whatever you want. If you want a stained look, then stain and a clear coat. Probably an oil-based product, depending on the species.
Contact paper is an option but I prefer the vinyl film that is used to put graphics on store fronts or vehicles. It's much more durable than contact paper and actually cheaper if you buy an entire roll.
Paint is another option. It really depends on what species these cages are for.
What is the FDP you talked about in your post?
I believe he said FRP, which is Fiberglass Reinforced Panel. It is that textured plastic you often see lining the bathrooms of restaurants, gas stations, places like that.
It's very durable and relatively affordable, but I'm not crazy about the appearance. Worth looking at, though.
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Current snakes:
0.1 Gonyosoma oxycephala - (Silver/Yellow)
1.2 Gonyosoma oxycephala - (Green)
7.6 Gonyosoma janseni - (Black)
0.1 Gonyosoma janseni - (Black & Tan)