Published 2026-04-25
Internal damp stains, ceiling marks and peeling internal paint usually point to a facade water-ingress problem outside, not an internal waterproofing problem. This brief sets out how we diagnose and treat facade water ingress from rope access.
Diagnose first
Before applying anything, we map the failure pattern. Water-ingress paths in Singapore high-rise facades typically include:
- Hairline and structural cracks in concrete or render
- Failed weather sealant at joints and panel edges
- Failed perimeter sealant at windows and curtain wall
- Blocked or missing weep holes
- Defective copings, capping, drips and parapets
- Bellow or interface details between dissimilar materials
A water test on selected zones can confirm the failing path before remedial work starts.
Treat at the source
Treatment varies by substrate:
- Concrete cracks: chase and fill with elastomeric sealant; for active or wet cracks, a polyurethane injection may be needed.
- Render: remove drummy areas back to sound substrate, prime, patch and recoat.
- Sealant joints: cut out, clean to bond surfaces, prime and reseal with the appropriate sealant.
- Window perimeters: rework perimeter sealant and check sub-frame waterproofing.
Warranty notes
Warranty wording depends on substrate condition, materials selected and access. We provide warranty terms in the proposal — including what is covered (e.g. workmanship of the sealant joints we install) and what is excluded (e.g. structural movement that opens new cracks elsewhere).
See the facade waterproofing service page for typical scope, or facade repair and maintenance if your building also needs concrete or render works.