Hi, I'm hoping for some advice with insulating a up an over garage door. I want to be able to use the room to keep my reptiles in but it's obviously too cold as it is, I was going to brick up the door and put a window in and convert in to a proper room but as I'm in a hurry and on a budget I'm looking at alternatives. It's an internal garage so one wall has the living room on the other side, one wall has next doors living room attached, the rear wall has a downstairs toilet then kitchen so basically are all internal walls, I assume these therefore wont need any work? Would I be able to just build a false wall behind the garage door with some kingspan in between? I only intend on using the internal door from the kitchen as access.