Dampness can impact a property in various ways, each presenting distinct challenges and requiring tailored solutions. Correctly diagnosing the cause is essential to avoid unnecessary, expensive repairs due to mis-diagnosis. Common issues include:
Rising Dampness: Moisture rising from the ground through capillary action.
Penetrating Dampness: Water entering through walls due to defects or poor maintenance.
Salt Dampness: Damage caused by salts carried by moisture, for example around chimneys.
Condensation: Excess moisture in the air condensing on cold surfaces, leading to mould.
Mould: Fungal growth resulting from persistent damp conditions.
Plumbing and Drainage Defects: Issues with pipes and drainage systems causing damp problems.
Many homebuyers misunderstand the purpose of a "Home Buyer Survey," often assuming it provides a comprehensive inspection of the property. In reality, these surveys are designed to identify potential issues, assess the property's value, and recommend further inspections by specialist surveyors to accurately diagnose the cause, extent, and necessary repairs.
Limitations:
Damp testing in a ‘Home Buyer Surveys’ are typically limited to periodic checks using electrical moisture meters. These may register inaccurate results due to the limitations of their equipment and a lack of specialist knowledge.
Referral:
Where damp issues are suspected, valuation surveyors will usually recommend a specialist survey for a thorough investigation.
At Olympic Surveyors, our surveyors are equipped with the expertise and specialist tools to determine both the cause and extent of dampness, providing accurate recommendations for the necessary remedial actions.
If your property is showing signs of dampness, we offer a comprehensive survey to identify the underlying cause. After discussing your concerns, our survey may include:
Advanced Inspection Techniques:
We use a range of specialist tools, including moisture meters, thermal imaging, hygrometers, endoscopes, data loggers, chemical analysis, and drones, to accurately detect dampness and moisture issues.
Detailed Surveys:
We assess a variety of potential causes, including blocked wall cavities, water ingress points, defective pointing, drainage systems, and floor voids, investigating problems such as subfloor flooding and condensation.
Gravimetric Testing:
Gravimetric testing measures the moisture content of materials by weighing them in both their wet and dry states. This precise method is the most accurate way to determine moisture levels, involving sampling, drying, and reweighing materials to calculate moisture loss.
Chemical Salt Analysis:
Hygroscopic salt analysis helps diagnose severe dampness by identifying salts that absorb moisture from the air. Using chemical tests on wall samples, we distinguish between free moisture and moisture drawn in by hygroscopic salts, enabling us to pinpoint the source of the dampness and the specific salts responsible.
Our comprehensive inspection process involves several key steps:
External Inspection:
Examining the external structure to identify bridging of the damp proof course, blocked or leaking rainwater systems, blocked wall cavities, and water ingress points from defective pointing or omitted cavity trays. Tools include endoscopes, drones, and zoom photography.
Drainage System Check:
Evaluating the rain or foul water drainage system for leaking, waterlogging the ground or flooding floor and wall voids.
Floor Void Inspection:
Using crawler drones with video and photographic capabilities to detect subfloor flooding, leaking pipes, condensation, or blocked subfloor ventilation that could be misdiagnosed as dampness.
Physical Inspection:
Removing skirting boards to check for bridging of the damp proof course by plaster.
Diagnostic Testing:
Removing samples for gravimetric testing and chemical salt analysis to distinguish free and hygroscopic moisture content, helping to accurately pinpoint the cause of dampness.
Not all salts are problematic. It’s important to differentiate between harmless efflorescent salts—white crystals that form as part of the drying process—and harmful salts that result from prolonged damp conditions:
Harmful Salt Formation:
Salt deposits can form within or between layers of materials (known as crypto-efflorescence) when drying is restricted (e.g. by impervious paints). Over time, these salts accumulate within the masonry pores, generating pressure that can exceed the masonry's strength. This may lead to spalling and delamination.
For expert advice and tailored solutions to address dampness and salt damage in your property, contact Olympic Surveyors.
If you're experiencing damp issues or need a pre-purchase damp survey, contact Olympic Surveyors today. Our expertise ensures an accurate diagnosis and effective long-term solutions to protect your home or investment.
Specialist Surveyors with expertise in cavity wall assessments.
Multi-award-winning PCA members , regulated by RICS.
State-of-the-art diagnostic tools ensuring accurate results.
Tailored remedial solutions for long-term property protection.
If you suspect wall tie failure or structural movement, contact Olympic Construction Ltd for a professional wall tie inspection.Early detection and expert remediation ensure the stability and longevity of your
