Monitor Lizard Enclosure Build Questions

[cparker]

I'm going to be building a 12x6x8 enclosure and have some questions.

Is foam or fiberglass insulation better? I don't really know how to attach the foam. How many bags of fiberglass insulation would I need to insulate the top, bottom and sides?

Should I put a waterproofer on the wood thats' not in contact with substrate?

Best thing to protect wood that touches substrate? FRP is hard to find by me and I don't have tools to cut it to the sizes.

Best way to connect plywood sheets together?

For the frame should I use screws or nails to secure it?

thanks