External Wall Waterproofing in Singapore
Wind-driven monsoon rain forces moisture through hairline cracks in external walls, showing up indoors as damp patches and peeling paint. We seal the wall from the outside with breathable, crack-bridging coatings.
Signs you need this
- Damp patches on internal walls after rain
- Paint bubbling or peeling on the inside face
- Visible cracks on the external façade
- Mould forming in the same spot repeatedly
- Musty smell along an external-facing wall
How we fix it properly
We inspect the façade for cracks and failed sealant, then route and fill structural cracks before coating. Window perimeters and movement joints are re-sealed because they are common entry points.
The wall is finished with a breathable, elastomeric waterproof coating that bridges fine cracks and repels rain while still letting trapped moisture escape — important for avoiding blistering.
For high-rise and commercial façades we work from gondolas or scaffolding with the appropriate safety controls, and can coordinate with MCST schedules.
Common causes we look for
- Hairline and structural cracks in the façade
- Porous or chalking external paint
- Failed sealant around windows and joints
- Capillary moisture rising through the wall
Our external wall process
- 1
Façade survey
Map cracks, joints and failed sealant.
- 2
Crack repair
Rout and fill cracks; re-seal window perimeters.
- 3
Priming
Clean and prime the substrate for adhesion.
- 4
Coating
Apply a breathable elastomeric waterproof coating.
- 5
Assessment
Confirm coverage and check internal walls dry out.
External Wall FAQs
Still unsure? A free assessment answers everything specific to your property.
Get a free, honest assessment
Tell us what you’re seeing — we’ll take it from there.
My inside wall is damp but the leak is outside — how do you fix it?
Rain penetrates the external face through cracks and porous paint, then shows up inside. The durable fix is to seal the wall from the outside, which is what we do, rather than only repainting the interior.
Will the coating change how my building looks?
Elastomeric coatings come in a range of colours and can closely match your existing façade. For MCST projects we provide samples for committee approval before proceeding.
Related services
All servicesRoof & Flat Roof Waterproofing
RC flat roofs, pitched roofs and gutters sealed against monsoon rain with membranes that handle full sun and standing water.
Water Leak Detection & Repair
Pinpoint hidden leaks with non-destructive tools before we lift a single tile — find the source, fix it once.
PU Grouting & Crack Injection
Polyurethane injection that fills and seals cracks from within the concrete — fast, targeted relief for active leaks.
Need external wall help today?
Book a free, no-obligation assessment or call our 24/7 line. Honest diagnosis, no unnecessary hacking.