Frequently Asked Questions

How do I know if my roof leak requires waterproofing or a full repair?

This depends on whether the issue is surface-level damage or a deeper system failure. On-site inspection is required to determine the root cause before any recommendation can be made.

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How long will my roof waterproofing last?

It typically lasts several years depending on the system used, roof condition, and maintenance. Properly applied systems are designed for long-term performance rather than temporary fixes.

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Will the waterproofing works disrupt daily activities at my property?

Most roof waterproofing works are carried out externally with minimal disruption. Some noise or limited access to roof areas may occur during the process.

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How is the cost of roof waterproofing and leakage repairs determined?

Cost is based on roof condition, severity of leakage, access difficulty, and required system. A proper site inspection is needed before final quotation.

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Will any hacking be needed or can I waterproof the current surface

Not always. It depends on whether existing layers are still viable or need removal to access the root issue. This will only be confirmed after inspection.

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What happens if it rains halfway through the waterproofing?

Works may be paused if rain affects safety or application quality. Waterproofing requires dry conditions for proper adhesion and curing.

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How do I trust that problems are not overstated?

We base recommendations on visible site conditions and water behaviour patterns, not assumptions. Clients are advised on all options so they can decide with clarity.

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Can I choose to only repair the affected area?

Yes, but this depends on the actual condition of the roof. In some cases, patch repairs may not solve underlying issues and could lead to recurring leaks.

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How do I tell if my roof needs urgent fixing?

If leaks are active during rainfall or spreading stains are visible, it should be addressed promptly. Delaying may lead to structural damage or worsening water ingress.

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Is there any guarantee or warranty for the work done?

Yes, warranty is provided depending on the system applied and scope of works. Coverage details will be clearly explained before commencement.

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What waterproofing systems or materials are used?

We use system-based waterproofing solutions selected according to roof type and condition. Materials are chosen for compatibility, durability, and long-term performance.

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How long does the whole process usually take?

Duration depends on roof size and condition, typically ranging from a few days to over a week. Weather conditions may also affect scheduling.

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My house only leaks during heavy rain, do I still need full waterproofing?

Intermittent leaks often indicate underlying system weaknesses, not just surface defects. Full assessment is needed to determine if partial repair is sufficient or not.

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How long before I need to worry about the same leak coming back?

If properly treated, recurrence should not happen within the warranty period under normal conditions. If leaks return early, it usually indicates an unresolved underlying cause.

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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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GJC Waterproofing

Pte Ltd

Team with 27 years of trusted waterproofing solutions in Singapore. System-based approach for lasting results.

© 2026 GJC Waterproofing Pte Ltd. All rights reserved.

Registered | UEN: 202618678D