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Proster Pinless Moisture Meter
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Stormdry Masonry Waterproofing Cream
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Dryzone Anti Condensation Paint
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Problem Summary: Understanding the Damp Issue and Insulation Failure
The homeowners in the video are experiencing random damp patches inside their house, which at first glance do not seem severe. However, these patches could become a more serious mould issue if not addressed properly. The house in question has a modern cavity wall, and the problem is not due to a general lack of ventilation since there are already air vents in place for a wood burner and an open fire.
Upon closer inspection, the root cause appears to be poorly installed cavity wall insulation. The insulation was improperly injected, leaving gaps and voids. These voids create cold spots, attracting condensation and leading to damp patches. External factors, such as a wooden deck installed too high above the damp-proof course, also contribute to moisture exposure.
Thermal imaging and moisture level readings confirmed that the affected areas coincide with insulation voids rather than a structural damp problem. The house’s humidity levels are also relatively high (72% relative humidity instead of the recommended 60%), further exacerbating condensation formation. Unfortunately, the installer responsible for the insulation might no longer be available, making remediation difficult.
Step-by-Step Action Guide to Address the Issue
Step 1: Assess the Damage
• Identify damp patches inside the house.
• Check for peeling paint, mould growth, or water stains.
• Use a moisture meter or thermal camera to detect cold spots.
Step 2: Inspect the External Factors
• Examine the house’s exterior for possible moisture sources.
• Ensure that the damp-proof course is not compromised.
• Check if decks or patios are too high, allowing water to splash onto the wall.
Step 3: Test for Insulation Voids
• Locate previous drill holes where cavity wall insulation was injected.
• Remove small sections of bricks or use an endoscope to inspect the insulation.
• Identify areas where insulation is missing or poorly installed.
Step 4: Reduce Humidity Indoors
• Use dehumidifiers or ventilation fans to lower relative humidity.
• Ensure extractor fans in the kitchen and bathroom are functioning.
• Keep doors and windows open when possible to improve airflow.
Step 5: Apply Protective Treatments
• Use storm-proof water repellent on the affected exterior wall.
• Apply anti-condensation paint inside the house to minimize moisture absorption.
• Seal gaps around air bricks and openings with appropriate weatherproofing materials.
Step 6: Consider Professional Help
• If the insulation issue is severe, consult a damp specialist.
• Investigate if the original insulation installer offered a transferable warranty.
• In cases where insulation is missing, evaluate if reinstallation is viable.
By following these steps, homeowners can manage their damp issues effectively and prevent further moisture-related damage.
