Damp in garage wall

[Marineboy]

To the OP, something I asked in my first post and has been repeated, have you checked your gutters?

Yes thanks, gutter working as it should.

 

[MikeJhn]

Where does the guttering discharge too?

 

[Marineboy]

Where does the guttering discharge too?

It joins onto the one on the long side which discharges into a water butt. No issues there.

 

[MikeJhn]

Does the water butt have an overflow, if so where too, as i said previously most damp issues are not rising damp, but an external source.