Trusted Since 1999 · Singapore
Roof Waterproofing Systems Built to Last,
Not Temporary Fixes
Team with 27 years of experience, transparent pricing,
48-hour inspection
response. We solve the root cause, not just the symptoms.
Team With 27 Years Experience
48-Hour Response
Up to 3 Years Warranty
Common Problems
Signs Your Property Needs Professional Waterproofing
These issues don't resolve on their own. Without proper diagnosis, they lead to structural damage, mould growth, and higher long-term costs.
Persistent Roof Leakage
Bubbling & Peeling Paint
When paint bubbles or peels on walls and ceilings, moisture is trapped beneath the surface. Repainting without addressing the source only delays the inevitable problem.
Recurring Repairs
If you've had the same area patched multiple times, the root cause hasn't been addressed. Surface-level fixes create a costly cycle of repeated work.
Our Services
Comprehensive Waterproofing Solutions
Every project starts with proper diagnosis.
We recommend only what's needed, no unnecessary work.
Clay Tile Roof Waterproofing
Complete membrane system beneath clay tiles with flashing and drainage integration for lasting protection.
RC Roof Waterproofing
Multi-layer waterproofing system for reinforced concrete flat roofs, including primer, membrane, and protective screed.
Roof Leakage Repair
Targeted leak detection and repair using injection grouting, membrane patching, or full re-waterproofing as needed.
Exterior Wall Waterproofing & Painting
Surface preparation, crack repair, and elastomeric coating application to prevent water ingress through walls.
Property Maintenance & Restoration
Exterior washing to roof refurbishing and gutter maintenance, enhancing the condition of your property.
Inspection Service & Assessment
Thorough assessment of your property's waterproofing condition with a detailed report and recommendations.
Why GJC
What Sets Us Apart From Other Contractors
In an industry where shortcuts are common, we pride ourselves on high-quality execution and full transparency throughout the project.
Transparent Material Tracking
Every material used is documented with brand, batch, and quantity. You see exactly what goes into your property. No substitutions, no shortcuts.
No Hidden Practices
We explain our process upfront, provide written quotations with clear breakdowns, and welcome your on-site presence during works.
System-Based Approach
We don't do surface-only patches. Our waterproofing is a complete system, from substrate preparation through to protective layers and drainage integration.
Our Process
A Structured Approach to Every Project
From first call to final handover, every step is planned, documented, and transparent.
Step 1
Inspection
On-site assessment within 48 hours to identify the source and extent of the issue.
Step 2
Diagnosis
Root cause analysis to determine why the problem occurred, not just where.
Step 3
Recommendation
Step 4
Execution
Professional installation by our trained crew with documented material tracking.
Step 5
Warranty
Up to 3 years warranty with post-completion inspection and maintenance guidance.
Recent Projects
Experience On The Field
Real projects, real outcomes. Each case represents our system-based approach in action.
Siglap
Bungalow Roof Restoration
Clay Tile Roof Waterproofing
Complete clay tile removal, membrane
installation, and retiling for a 38-year-old bungalow with persistent leakage.
Duration
24 days
Warranty
3 years
Geylang
Commercial RC Roof System
RC Roof Waterproofing
Full waterproofing system for a 3-storey
commercial building including drainage repair
and protective screed layer.
Duration
18 days
Warranty
3 years
Upper Neram
External Wall Restoration
Exterior Wall Waterproofing
Complete restoration for an aging property, washing and repainting of exterior walls and roof as well as other minor repairs.
Duration
12 days
Warranty
2 years
Our Warranty
Protection That Lasts Beyond the Project
Every completed project includes a written warranty covering workmanship and materials. Warranty terms vary depending on the system and scope.
Up to 3 Years Coverage
Depending on the waterproofing system applied and project scope.
Written Documentation
Formal warranty certificate with scope, terms, and claim process.
Post-Completion Support
Complimentary follow-up inspection within the warranty period.
Get in touch today
Send us a message
1. Every property condition is different, which is why proper on-site inspection is required before recommending the appropriate solution.
2. Final advice and quotation will only be provided after assessment of the affected area and underlying issue.
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