Thanks in advance for any answers.
I have just had a shed installed which is built onto the side of our house. It has a metal roof, with OSB board under it (there are wooden noggins to support it).
I have tried to insulate the roof with Polystyrene blocks, which we intend to cover with plasterboard.
The sides of the shed have been insulated in the same way - although there is no metal on the sides it's just wood. The main difference being, that I have used a vis screen on the cold side of the polystyrene. There have also been vents cut in the sides of the panels towards the bottom.
The floor is currently just a concrete slab with flags in between. There is nothing over the top of it.
The sides of the shed are showing no signs of mold, however the roof is - behind the polystyrene blocks. I am guessing that this is due to moisture being trapped and a lack of ventilation. Does anyone have any ideas for a solution that we could use to avoid this? Or am I better off just taking the plasterboard and polystyrene off of the roof and forgetting trying to insulate it?