We have a relatively small bathroom with no windows. The bathtub is against
an external wall. Every time it rains heavily there's an odor in the room.
It's not really bad but it's mildly unpleasant and because of the rain, I
assume it's dampness. During a dry spell I soaked the ground outside the
house where the bathroom is, and the smell returned.
What could be wrong? The house is only four years old and this has been
going on since we moved in just after it was built. The bathroom has
carpet, which we plan on replacing soon with tile. Might the builders not
have 'sealed' under the bath or something along those lines? If the wax
seal on the toilet is not in right, could this explain it?