There will be a 4 inch vent in and vent out. I went for this size as uts the cheapest option. I will have a small inline 4 inch fan pulling fresh air from outside then a filter pulling air and cleaning it to push out into the rear/opposite side of my intake.
I have used up all of my foil insulation and had a little spare for the roof area just above where my tents will be. I then took this stuff.....:
....which is usually used for under floor insulation and heating projects, apart form I am using this for my roof! It has acoustic insulation properties too so all good
Also I purchased a big expanding foam bottle and filled every gap I could find to seal everything in.
I now need to clean and tidy, glue the DMP to the sides so no draughts get through around the floorings perimeter. Get all my stuff over and and stat popping seeds again! Then it's finding time I can stop the electric in there for one day and get and electrician in to sort a consumer unit into the garage. Then I will be cooking with Gas! Nice single sofa, little TV and stereo and I'm away

