High deep scan reading to tiled solid floor
High mositure reading to skirting boards
Introduction
This report summarises the findings from a recent inspection of the kitchen and cloak room solid floor areas, with a particular focus on moisture readings and the effectiveness of the Damp Proof Membrane (DPM).
Observations
Elevated Radio Frequency Mode Readings: In certain areas of both the kitchen and cloak room, solid floors, the radio frequency mode readings were found to be elevated. This typically indicates a higher presence of moisture within the floor structure.
Low Pin Surface Readings: Conversely, the pin surface readings in these same areas were notably low. These readings generally reflect the moisture content at the surface of the floor covering, in this case, ceramic floor tiles.
Discussion
The disparity between elevated radio frequency readings and low pin surface readings suggests that moisture may be present deeper within the floor substrate, rather than at the surface. One plausible reason for these discrepancies could be the absence of a Damp Proof Membrane (DPM), or that the existing DPM is situated close to the surface of the floor. The DPM is designed to prevent moisture ingress, and its effectiveness is highly dependent on its correct placement within the floor build-up.
This indicates the absence of a Damp Proof Membrane (DPM) or if it is positioned close to the surface of the floor structure. This can lead to elevated sub-surface moisture levels while the surface remains relatively dry. The discrepancy in readings could also be attributed to hidden plumbing leaks, which should be investigated further.
It is possible that the tiled floor covering is serving as the DPM. In such cases, the damp proof course (DPC) in the wall may have been compromised, allowing moisture to travel upwards into the wall plaster. Over time, this could lead to the deterioration of skirting board and above plaster.
Recommendations
Further investigation should be undertaken to confirm the presence and location of the Damp Proof Membrane in the affected areas.
If the DPM is found to be absent or improperly installed, remedial measures should be considered to install or reposition the membrane to ensure adequate moisture protection.
Regular monitoring of moisture levels in these areas is advised to prevent potential long-term damage.
Consultation with a qualified damp proofing specialist may be beneficial to determine the most effective solution for these discrepancies.
Conclusion
The findings highlight a potential issue with moisture ingress in the kitchen and cloak room walls, likely related to the Damp Proof Membrane. Addressing this promptly will help maintain the integrity of the floor and walls and prevent further complications.
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Key factors contributing to Portsmouth’s damp problem: