Plans for a new garden room

[andy19422]

Hi, I am planning to build a garden room/ man cave to display the replica film props I make and need some feed back on my design please. The room will be 24x12 and have a reverse Apex roof. The base will be made from 4x2 and raised about 6" off the ground. The floor will be either 18mm Exterior ply or P5 flooring. The walls will be a 4x2 frame with 12mm Exterior ply with vertical battens covering the joins. Spacers will be glued to the inside then 50mm polystyrene sheet will be used for insulation then 12mm plasterboard on the inside. The roof will be made on 4x2 rafters and clad in 9mm Exterior ply then Bituminous corrugated sheet. The inside of it will have the same polystyrene and plasterboard. Does this set up sound alright or am I asking for trouble?

 

[OLD]

This is what i did http://chrisalison.webs.com/ note insulation to floor and breather membrain.

 

[andy19422]

Thanks old, I'll have a good look at your plans. I doubt I will have any windows due to it also being a home cinema, maybe just a glazed door.