After the heavy rain last week, the shop tenant contacted us about damp on the shop walls, especially evident along a wall which is a narrow alleyway between the shop and another building ( 3 feet wide). The damp is in patches, randomly dotted along the wall near ground level.
Externally, the wall is rendered and a cursory inspection indicates render down to ground level (bad?!). The alleyway is also flagged so water bounces onto the render (
![Confused :?](./images/smilies/icon_e_confused.gif)
![Confused :?](./images/smilies/icon_e_confused.gif)
The question I have - who is the appropriate trade to contact for a professional assessment of the problem(s).
(I think that the solution would be to remove the flags, lower the ground to below the render ( probably the render has blown anyway so likely needs re-render, at least in part), consider installation of a drainage system ( French drain) to channel water to the manhole drainage pit, modify the downpipe to drain into said manhole drainage and not onto it's solid cover ( ffs!). ) eventually re render with lime mortar. I've not considered installation of a chemical DPC and , to be honest, think that they are of dubious benefit other than to the installer ( just an opinion , happy to be told to the contrary)! Oh, and the internal walls have been painted with a non breathable paint onto which hot air is condensing onto a cold wall. )