The suitable system depends on roof condition, exposure level, movement, drainage conditions, and expected lifespan.

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"

No. Paint may temporarily improve appearance but does not resolve active waterproofing failure.

Periodic inspections every few years are recommended, especially for older roofs or after severe storms.

Poor drainage slope, blocked drains, or uneven surfaces may trap water after rainfall.

Roof leaks are tricky because water rarely travels in a straight line; a leak showing up in a living room ceiling might originate a few meters from the roof. We don't guess. We perform a thorough physical inspection checking for cracked membranes, damaged flashing, or blocked drainage. If the source isn't obvious, we use diagnostic methods like thermal imaging (infrared cameras that detect trapped moisture under the surface) or conduct a water ponding test to isolate and confirm the exact entry point before we touch anything.

It depends entirely on the age and overall condition of your current waterproofing layer. If the roof is relatively new and suffered localised damage, we will suggest a targeted patch which is both completely fine and cost-effective. However, if the existing membrane is the causation, patching the affected areas is a temporary bandage. The water will simply find the next weakest point in time to come. We will give you an honest assessment after our inspection.

Not necessarily. Whenever possible, we look for non-destructive methods. Hacking is loud, messy, expensive, and often completely unnecessary if the underlying structure is physically sound. At GJC Waterproofing, we offers highly reliable, non-destructive alternatives that save you time and money, unless the water leak has gone ignored for so long that the internal steel rebar has rusted, expanded, and caused chunks of the concrete ceiling to crack and fall away. The structure has to be treated before rebuilding it. Other signs include:

Hollow or Popping Tiles: The tiles on your roof terrace are lifting, cracking, tenting, or sound completely hollow when tapped, the tile adhesive has failed. Applying a coating over structurally unstable tiles will fail, so they must be hacked away to reach a solid base.
‍Severely Waterlogged Substrates: If a thermal moisture scan reveals that water has completely saturated the insulation or screed layers beneath the surface across a massive area, trapping that moisture under a new coating will cause intense blistering. The wet sections must be cut out or completely hacked to let the structure dry.

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. In the event of a total replacement of the membrane or hacking, 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.

With proper application and professional materials, a quality roof waterproofing system should easily last 10 to 15 years. To maximize that lifespan, we highly recommend a quick annual inspection to clear debris from gutters and drains, ensuring water does not pool continuously on the membrane.

In inter-terraces and semi-detached properties, roofs are physically joined. Frequently, a leak showing up on your attic ceiling is actually caused by broken clay tiles or a failed concrete membrane on your neighbor's side of the property line. Water simply tracks laterally along the shared beams. Here is how we help you resolve this smoothly:
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1. Non-Invasive Diagnostic Evidence: We use thermal imaging cameras and moisture meters to map out the water path. This gives you clear, undeniable visual proof to show your neighbor exactly where the water is entering.
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2. Joint-Repair Solutions: We highly recommend speaking with your neighbor about doing a joint repair. Fixing both sides of the shared ridge or party wall flashing simultaneously is the only way to guarantee a permanent seal.

3. Isolating Your Boundary: If your neighbor is uncooperative or delaying repairs, we can apply specialized boundary-isolation flashing and high-build vertical barriers along your property line to shield your home independently as much as structurally possible.