Damp patches and water stains inside flats most often originate from perished joints and sealant on the facade. The fix is not repainting the interior but removing and rebuilding the facade joint; otherwise the problem returns within months.
The most common mistake with water ingress is treating the symptom as the source. Painting over the stain on an internal wall hides it but does not stop the moisture; a few months later the paint blisters again.
Signs the water is coming from the facade
- The stain sharpens after rainy days and fades in dry weather
- Damp concentrates at window edges or along the line between facade panels
- Several flats on the same vertical report the same problem
- Plumbing has been checked and no leak was found
- The issue appears only in flats on one particular elevation
The correct sequence
- The facade is inspected on rope and the condition of joints and sealant examined close up.
- The perished joint is removed completely. Running new sealant over the old does not work, because the new material will not bond to the old surface.
- The surface is cleaned and allowed to dry fully.
- New sealant suited to the cladding is applied.
What affects joint life
On curtain walling, joint life depends on the product used and on sun exposure. South-facing elevations weather noticeably faster under ultraviolet light. In buildings exposed to sea air, salt accelerates the process further.
Why rope access suits this work
Joint renewal is usually needed on specific lines rather than across the whole facade. Erecting scaffolding is uneconomical for such localised work; on rope, only the affected areas are accessed.
Frequently asked questions
How can I tell whether damp is coming from the facade?
If the stain sharpens after rain, concentrates at window edges or panel lines, appears in several flats on the same vertical, and plumbing checks found nothing, the source is most likely the facade.
Can new sealant be applied over the old?
No. New material will not bond to the old surface. The perished joint must be removed completely, the surface cleaned and dried, and new sealant applied.
Does joint renewal need scaffolding?
Usually not. It is normally required on specific lines rather than the whole facade, and rope access reaches only the areas that need work.