Damp Proofing

Newly plastered room. One corner still wet near external drainpipe.

Anonymous user 28/02/2024 - 3.17 PM

We've had our living room skimmed, the plaster everywhere has now dried out well except one corner where the plaster has become solid but is cold/damp to the touch. We thought maybe it's just the plaster taking a long time to dry, it's been a week now and the corner hasn't changed much at all. On the exterior side of the wall is a down drainpipe. Is it likely some form of damp that isn't letting the plaster dry properly? If it is some sort of damp, is it a quick/easy fix? Hoping its just a case of chipping off the new plaster, applying some sort of damp proofing to the brick and replastering? If it's a long and messy job, we may just have to hide it over christmas and tackle it in the new year. Is there any temporary fix for it just so it looks presentable for a month or so? Is checking for damp something the plasterer should have done? Is that something they will need to correct? Or will I need to pay for a damp specialist to fix the problem area then pay the plaster extra to replaster over it again? Any advice would be great.