Not much actually has to go into it. First we built the room and properly insulated the walls and even out some on the floor to create a barrier from the concrete. Added some plywood to make it a firm surface again. After that, the panda film went up on the walls, ceiling, and floor. Made sure everything was pulled tight and taped to create a "seal". As for the entrance, there is a door with gasket material on it to create a tight seal and we have a zipper door in the panda film to get into the room. So we basically have a "buffer" zone or "air lock". That's about it for the room itself.I haven't started looking into sealed environments......can you share what you did for that and what you need to have as a baseline in terms of room? I am looking at going that direction when we finally get our place in the location we want it.