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I'd guess more ventilation, rather than less - the damp is probably condensation from warm indoor air hitting cold external walls. Which would also suggest keeping the door shut and leaving it cold in there.
Undamaged modern bricks and mortar are pretty impermeable. Sealing them isn't going to do much.
NotThamesWater
We're into our new home and this is the garage. it's a single skin brick wall and the site manager said something about the walls possibly sweating in wet weather and leading to damp in the garage.
We've only been in a short time but it is certainly damp... several times I've felt condensation on the metal bikes and my TT bike is happily growing mould. I'd like to fix this, however at this point I'm not certain the water is coming in through the walls. The walls feel dry to the touch and my guess is that it's damp air coming in around the edges of the garage door? Does anyone have any solutions?
The site manager suggested applying weather seal to the outside, while someone else suggested some kind of latex paint for the inside?
It doesn't need to be perfect but presumably damp isn't ideal storage for bikes nor anything else we stash up in the rafters.
My ultimate aspiration (maybe wishful thinking) is that the garage can be used more as a gym/workshop than as a storage space.