Overview
This project involved treating persistent low level dampness in a 1930s property in Bolton-upon-Dearne. The home had been retrofitted with a damp proof membrane under a council grant scheme, using a magnesium based screed on top of the existing floor. Although this was intended to resolve damp issues, the installation created a new problem that caused surface moisture and staining for many years.
The Problem
Many properties of this era were constructed with concrete floors that did not include a damp proof membrane. When the council grants were issued decades later, contractors often installed a new membrane and screed but only removed the skirting boards, not the plaster. This created a bridge over the original physical damp proof course, allowing moisture to rise into the wall above it.
The same issue occurred in other homes where mastic asphalt screeds were installed, making this a common and long standing problem in properties of this age. In this case, the bridged DPC had caused low level damp patches throughout the ground floor, despite the newer floor system.
Our Solution
To correct the issue, we installed the Express Damp Proofing System which provides rapid and reliable protection for walls affected by a bridged course. We then applied a Dry Base liquid damp proof membrane to the surface of the screed. This combination ensures that moisture cannot pass into the finished surfaces, restoring the integrity of both the floor and the wall junction.
The Result
The property is now dry at low level with the damp staining fully resolved. By isolating the moisture source and reinstating a continuous barrier between the floor and walls, the system provides durable protection and prevents further bridging issues. The homeowner can now redecorate with confidence knowing the underlying problem has been properly addressed.
Need Help with a Similar Issue?
If your property has low level dampness or you suspect a bridged damp proof course, we can help. Visit our Damp Proofing page or contact us to arrange a professional assessment.
