Damp in buildings is caused by unwanted moisture entering or forming within the structure. This typically occurs through rising damp from the ground, lateral or penetrating damp through walls, leaks from roofs, decks or plumbing, or condensation caused by poor ventilation. In many cases, damp problems are made worse by failed waterproofing systems, poor drainage, or incorrect detailing that allows moisture to become trapped rather than managed.

No. While dry, warm weather can be helpful for certain external waterproofing and coating applications, most damp and waterproofing work can be carried out throughout the year. Internal treatments such as rising damp repairs, shower waterproofing, negative pressure tanking, and drainage installations are not season-dependent. Where weather conditions may affect curing or application, the correct systems, timing, and protection methods are used to ensure proper performance.

The type of damp is determined by where the moisture is coming from and how it behaves, not just by how it looks. Rising damp typically appears at low level and rises upward from the floor, penetrating or lateral damp enters through walls due to external moisture or pressure, and leaks from showers, roofs, decks, or plumbing are usually localised around specific areas. Condensation, on the other hand, is related to ventilation and temperature differences. Because different damp types can look similar, a proper inspection is often required to identify the true cause and select the correct treatment.

Not always. Mould can be caused by ongoing damp from water ingress, but it can also develop due to condensation, poor ventilation, or high indoor humidity, even when there is no structural damp problem. However, persistent or recurring mould — especially when accompanied by staining, peeling paint, or damp walls — often indicates an underlying moisture issue that should be properly investigated rather than treated with cleaning alone.

Damp usually returns when the underlying cause of moisture has not been correctly identified or resolved. Surface repairs such as painting, replastering, or sealing visible damage may improve appearance temporarily, but they do not stop moisture entering or moving through the structure. Damp can also persist if incompatible materials are used, drainage or pressure issues are ignored, or moisture is trapped rather than managed. Permanent solutions require correct diagnosis and a system designed to address the source of the moisture, not just the symptoms.

Damp proofing and waterproofing address different types of moisture problems. Damp proofing is used to control moisture moving through walls by capillary action or low-level ingress, such as rising damp, using systems like chemical damp-proof courses. Waterproofing, on the other hand, is designed to resist active water penetration and pressure, such as in showers, decks, roofs, basements, and retaining structures. Choosing the correct approach depends on how moisture is entering the structure, which is why proper diagnosis is essential before treatment begins.