Often a symptom of serious damp ingress causing structural damage, plaster disintegration, and health hazards
Condensation is often mistaken as "just moisture on windows," but it's frequently a symptom of serious underlying issues that can cause catastrophic structural damage.
During thermal imaging surveys, we have observed readings that, when converted via surface moisture calculations, would be equivalent to approximately 250% of surface saturation (note: relative humidity is physically capped at 100%). These elevated values indicate the presence of liquid water or active moisture ingress, rather than simple condensation or superficial moisture accumulation, and are often misinterpreted by standard measurement methods.
Windows showing "simple condensation" often have litres of water accumulating on sills daily. This water migrates into walls, causing saturation far beyond surface level.
Constant wetting/drying cycles cause plaster to expand and contract, leading to cracking, spalling, and complete structural failure of internal finishes.
In winter, trapped water freezes and expands by 9%, creating micro-fractures in masonry that worsen each season, leading to irreversible structural damage.
Warm, moist air contacts cold surfaces (windows, walls). RH equivalent reaches 150-250%+ as surfaces drop below dew point.
Water doesn't stay on surfaces. It wicks into porous materials - plaster, brick, timber - through capillary action, often travelling meters from the original condensation point.
Water migrates downward due to gravity, saturating lower wall sections. This creates perfect conditions for:
Each wet/dry cycle weakens structural integrity. Freeze/thaw cycles in winter cause expansion damage. Within 2-3 years, what started as "simple condensation" requires major structural repairs.
Scenario: Single-glazed window in 1930s property
This volume of water is equivalent to multiple buckets annually, all migrating into your walls.
Ventilation helps, but often addresses symptoms, not causes. Here's what actually works:
Before any treatment, identify:
Our thermal imaging surveys provide these answers in minutes.
Ventilation must be correctly sized - our calculator helps.
Use our professional calculators to understand your condensation risks
These tools provide guidance, but professional diagnosis is essential for persistent condensation.
Persistent condensation often masks serious damp ingress. Our thermal imaging surveys reveal the truth in minutes.
Detect hidden moisture and cold spots
Pinpoint exact water migration paths
Actionable repair recommendations
Our surveys differentiate between simple condensation and serious damp ingress requiring structural repairs.
Proper diagnosis first. We carry out professional damp surveys to pinpoint the real cause of moisture problems — and give clear, practical fixes that suit your property.