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My (garden) shed often has a damp floor - brick paviors over a concrete base and no damp course - trimming a bit off the top and bottom of the doors improved things no end. Ground water still finds its way in, especially after rain, but the floor dries fairly quickly without obvious condensation elsewhere.
I think ventilation at both high and low level is the thing, given that water runs downwards (gravity) and humid air rises (less dense than dry air?)
Modifying the doors looks achievable - can you cut them evenly so no-one else will notice? Say 5-10mm off the top and bottom?
I've currently got a shed outside the flat I'm renting made of bricks and with wooden doors. Security wise these aren't great but there are solid metal poles inside to attach the bikes to with U locks which is what I've been doing to date.
My problem however is that the shed seems to get pretty humid through what I think could be condensation as humidity seems to be coming from the ground and not leaking through the roof. After speaking about it with my dad he seems to think it's due to having little to no air going in and out.
Has anyone previously had experienced with a similar problem? Here's a couple of pictures of what it looks like:
It would be great if I could fix this issue to avoid bikes potentially rusting or deteriorating as I don't have space inside the flat to store three bikes.