Damp Proofing

New conservatory - Damp coming up through concrete screed

Anonymous user 03/03/2024 - 3.09 PM

I had a new conservatory built a couple of months ago - dwarf walls on three sides and a full height wall on one side. A couple of days after the screed floor was laid, it rained heavily (remember the storms in late July??) and then damp patches began to appear on the floor. This now happens every time there is significant rain - sometimes the next day and sometimes maybe 2 days later... We mentioned to the builder beforehand that the back garden (where the conservatory is now) used to get very wet in the winter - often some standing water. The builder has suggested now that he may have dug deep enough to hit the water table, or that there may even be an underground spring! I'm not sure if either of these are the case though. However, he has said that the way to approach this problem is to remove the floor, tank the conservatory and then relay the floor. So - does this sound like the right approach, please? Also, my father-in-law has suggested we consult the building inspectors, but I'm not sure what it is they could do?? Many thanks in advance!!