I know there have been a few threads on this but I'd appreciate some input on my particular problem with my garage.
My garage is build of single skin breeze blocks, two up and overs (locked shut), a single door and a roof made mainly of corrugated steel.
It's waterproof but in the winter, it has major condensation - presumably from the slightly warmer air in the garage condensing water onto the cold roof overnight. It pretty much rains inside when it's bad...
This isn't doing my bikes or anything else in there much good.
So what's the solution? I've read that ventilation will help but I can't believe that that will solve it - it's a large volume of air that'd going to hold water and it will always condense when in contact with the cold roof.
I've read about people insulating with Kingspan or similar - is that a good idea? It seems like it should be fairly simple and something I can do myself and not too expensive. If I did do that, should I leave an air gap or not? If I can leave a gap, it'll make fitting much easier as I can fit the insulation between the main beams and then seal any gaps with expanding foam.
This is how the roof's built:
basically, metal roof attached to thin beams (approx 2" deep) with the main beams you see going L->R in the pic doing the structural bit.
Suggestions very welcome before the "rain" starts this winter