ok i'm doing the bathroom, not literally of course! I've ripped the room out to bare brick and am in the process of putting up a stud wall (2"x2" beams) using 'hardiboard' platerboard which is moisture resistant and can tile straight on. Now, i'm wondering about insulation. Do i have to use wall insulation inbetween the studs or can i use 13mm space age loft insulation. Only ask as it's buy one get one free at B&Q. Oh, and i only have approx 6m x 2m to do!!