DIY Doctor UK DIY Forums

Hi, I have a shared concrete roof with my neighbour. I can access it via a side door of my property and it has a covered passageway and 2 small rooms. It's currently totally uninsulated but I'm planning on running water to the furthest room to plumb in the washing machine and want to add a little insulation to prevent pipes freezing.

The problem I have is that there is only 55mm from the top of the windows/doors and the roof. I can't insulate on top due to it being a shared roof and there is no room for a ventilation gap for a cold roof. Do I just stick celotex to it and accept I'll have moisture issues or is there another solution?

Thanks for the help.

Ben

It is perfectly fine to use an insulated plasterboard like a Celotex PL4000 or similar and fix directly onto the pine sheeting. When you have this done you can then skim over the plasterboard that is attached to the insulation for a good finish.