Black or green stains are usually caused by algae, fungus, mold, or dirt buildup due to constant moisture exposure and Singapore’s humid weather conditions.

In some cases, yes. However, failing or incompatible systems may require removal before new application. At GJC Waterproofing, we do not engage in "predatory upselling" and "'rouge mechanic"

Paint bubbling or peeling is often caused by trapped moisture beneath the coating, poor surface preparation, or failed waterproofing systems rather than paint quality alone.

Yes. Even small cracks may allow rainwater to penetrate the wall surface over time, eventually leading to damp interior walls or ceiling damage.

The lifespan depends on the coating system used, wall condition, weather exposure, and maintenance practices. Different systems offer different durability levels.

Not necessarily. Some cracks are minor surface issues, while others may indicate deeper movement or waterproofing failure. Proper inspection helps determine the suitable repair approach.

Not every project requires full-building waterproofing or repainting. In some cases, localised repairs or treatment on selected walls may be sufficient, especially if the problem is isolated or detected early. However, the suitable approach depends on:

1. The extent of deterioration, whether moisture has spread beyond visible areas, the age and condition of existing coatings.
‍
2. If the surrounding walls are showing signs of weakening.

For example, isolated cracks or minor seepage may only require localised treatment,while widespread peeling paint, multiple leakage points, or aging coatings across several elevations may indicate broader waterproofing deterioration. During inspection, we will assess your property and only recommend what kind of restoration would provide better long-term protection while being cost efficienct.

Exterior painting focuses mainly on appearance and surface protection, while waterproofing systems are designed to reduce water penetration and protect the wall structure itself.

A standard residential or small commercial roof takes a couple of day to weeks depending heavily on the weather and systems used. Waterproofing requires dry surfaces to cure properly. Good news is that since all the work happens outside and on top of the building, your daily indoor routine will not be disrupted. The only thing you will notice is some minor foot traffic noise on the roof and the faint smell of coatings or primers during application. Some clients may prefer to stay clear of the property for a short period of time. Great time to go for a vacation!

We monitor local weather before commencing works. If rain is expected, we do not apply liquid coatings or open up vulnerable sections of the roof. If an unexpected shower hits, we always have heavy-duty, commercial-grade tarps ready to instantly tent and secure the workspace. Your interior will remain protected throughout the process.

We provide a warranty of up to 3 years, depending on systems and work done, on both our workmanship and materials. This means if the roof leaks again in the treated areas due to a failure in our application or material defect, we will come back and repair it at zero cost to you. Please note that warranties generally cover the specific areas we waterproofed, not new damage caused by major structural settling or external third-party modifications later on. Full coverage will be explained before total handover.

The lifespan depends on the coating system used, wall condition, weather exposure, and maintenance practices. Different systems offer different durability levels.

Effective waterproofing systems can significantly lower ongoing maintenance expenses by preventing frequent paint damage, minimising moisture-related repairs, and delaying the onset of wall deterioration. By creating a robust barrier against water intrusion, these systems help maintain the structural integrity and appearance of your property, ultimately saving on costly repairs and repainting.