If you use the Home Depot racks and if you are planning to glue board onto the bottom of the shelves, make sure you use brand name Liquid Nails, and be generous with the application of it. I used some sort of off-brand Liquid Nails and had the very unfortunate experience of the board coming unglued all over my rack system. It is a lot of work to disassemble the entire thing and re-glue all the boards, especially when it happens after the snakes have been living in there, so make sure to do it very carefully the first time!