
"The most common cause of widespread dampness in loft insulation is internal condensation in lofts - not necessarily a roof leak. This occurs when warm, moist air generated inside the house (from cooking, washing, etc.) escapes into the cold loft space."
"Condensation is almost always the root cause and poorly installed insulation can create this effect. That's why modern buildings tend to use warm roof construction or cavity walls rather than cold decks and hybrid roof systems."
Visible wetness in loft insulation appears as dark patches, mould and sagging and can reduce insulation effectiveness and increase energy bills. Two primary causes are internal condensation and roof leaks. Internal condensation happens when warm, moist air from cooking, washing and household activities escapes into a cold loft and condenses on insulation or the roof deck. Poorly installed insulation and inadequate ventilation worsen condensation issues. Roof leaks produce localized wet areas and structural damage. Effective responses include finding and repairing leaks, improving ventilation, installing vapour control layers or warm roof systems, and replacing saturated insulation.
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