RLJ

It is a trussed roof yes not boarded or anything yet. I will chuck plenty of insulation up there. I hadn't actually given the floor any thought. I was planning on keeping the rubber click together type flooring in place. Will moisture come up through the concrete slab? Do I need to insulate the floor as well? I'll aim for 50 on the walls then. You say under spec is there anywhere I can actually find the spec? I'd like to see where I can get it within or near the spec but under what circumstances will this matter if its in my own garage anyway? Thanks

Hi all, I'm looking to convert my new garage into additional room used for working in. It's single skin detached with a pitched roof newly built (if that makes a difference). Obviously I want to make this into a normal room adequately insulated and holds off the mould that seems to appear after a while currently. I will get the garage door bricked up with a upvc window. I will board it all out myself and then get a plaster in to skim it over. My idea was to use 25mm celotex on the walls between studs and plasterboard over the top. Understand 25mm is the smallest size and arguably won't do much? (Let me know what the minimum you'd realistically want). With rockwool or thicker celotex above the roof. Does this seem okay or am I missing anything obvious? There Is damp proof membrane above the damp course bricks but I have also brought dpc gel to insert into the brickwork. The internal brick walls are also painted over if this makes any difference.   Thanks in advance..