Originally Posted by
rocky_robin
You say it's damp, but where is the damp at?
The floor wet, or is the bricks wet to touch?
Did you build the garage, or was it part of the house when built?
There could be DPC or DPM missing, therefore you could be fighting a loosing battle.
Ventilation is key to reducing the dampness inside.
There is different routes that you could take, i.e. sticking polysterene (spelling!) on the walls, then plyboarding over it. Sticking insulation above too. That is cheap to do.
Do this before heating, or else your just as well opening the garage door with the heater on!
i was just about to say about the probable lack of a damp proof membrane and damp proof course in your garage. if its newly built, its likely that neither were installed because afaik it is not a requirement in the building regs for a garage to have either of these things!!
if its not got either, then your dampness is more than likely coming from the floor! is there a cavity in the walls or is it single brick built?
there is things that you can do to sort the dampness but a dehumidifier may be the cheapest option!!