Damp room under stairs

[themoo]

I would be grateful for any advice on how to handle this. It's an unventilated little cubby hole under stairs and the damp gets bad as you can see from the black mould which I cleaned off a couple of months back.

It gets flooded when the rain is really bad, but I've put sandbags up which helps hugely. However this does seem to make the damp even worse! I've got a dehumidifier in at the moment.

The porch outside has an air brick in it so if I put something like that in will that do the trick?

I would really like to sort it out.

Thank you!

 

[endecotp]

It's an unventilated little cubby hole under stairs

Those are external stairs, right?

Does it open into the porch, or into the inside of the house?

It may be unrealistic to expect it to be dry.

 

[themoo]

Thanks for your reply. Yes, they are. It opens into the porch. I was wondering if a ventilation thing / airbrick like the one in the porch might help.

 

[endecotp]

If it were mine, I'd probably only try to store wet / outside things in there, e.g. that mop, wellies, gardening things etc.

I suppose a vent might help a bit, but the surfaces are always going to be cold so any moisture is inevitably going to condense.

Taking the door off, so it is just an alcove in the porch, would also increase air circulation.