Underwater Grouting.When most people admire a beautifully tiled swimming pool, whether at a luxury resort in the Maldives, a five-star hotel in Colombo, or a private residence, they rarely think about what is happening beneath the surface. They notice the sparkling water, the perfectly aligned tiles, and the overall appearance of the pool. What they do not see is the critical role that grout plays in holding the entire tiled system together.
Grout is often one of the most overlooked components of a swimming pool, yet it is one of the most important. It acts as a protective barrier between tiles, preventing water from penetrating beneath the tiled surface and safeguarding the adhesive layer that keeps every tile securely bonded to the pool structure. When grout begins to deteriorate, crack, erode, or disappear altogether, the consequences can be far more serious than most pool owners realise.
At Da Vinci Ceramics, we have spent years dealing with the challenges associated with deteriorated pool grout, particularly in commercial swimming pools and luxury resort environments where shutting down operations is simply not an option. Through years of experience and innovation, we have become pioneers in the field of underwater grouting, offering a highly specialised solution that allows pools to be restored without the need for draining them.
This unique service has transformed how swimming pool maintenance is carried out across Sri Lanka and the Maldives, allowing resorts, hotels, and homeowners to address grout failure while keeping their pools operational.
The Hidden Importance of Grout in a Swimming Pool
Most pool owners view grout as nothing more than the material that fills the spaces between tiles. While that may be true at a basic level, its function extends far beyond aesthetics.
Every tiled swimming pool operates as a system. The tile is only one component of that system. Beneath the tile lies an adhesive layer, beneath that lies the waterproofing system, and beneath that lies the structural shell of the pool itself. Each layer depends on the integrity of the layers above it to perform effectively.
Grout serves as the first line of defence against water intrusion. It helps seal the joints between tiles and significantly reduces the amount of water that can migrate beneath the tiled finish. In a constantly submerged environment such as a swimming pool, this role becomes incredibly important.
Unfortunately, grout is continuously exposed to harsh conditions. Pool chemicals, chlorinated water, saltwater systems, ultraviolet radiation, thermal expansion and contraction, mechanical cleaning equipment, and normal ageing all contribute to gradual deterioration over time. While the process may be slow, it is inevitable.
What begins as a minor crack or small section of missing grout can eventually develop into a significant maintenance issue if left unaddressed.
When Grout Starts to Fail
One of the biggest challenges with grout deterioration is that it often happens gradually. Pool owners may walk past the same area every day without noticing the subtle changes taking place beneath the water.
As grout ages, it can begin to lose density and strength. Small sections may become loose and wash away. Hairline cracks may develop within the joints. Certain areas may begin showing signs of chemical attack or erosion. Before long, gaps begin appearing between tiles. Many pool owners mistakenly believe that these gaps are simply cosmetic issues. The pool still holds water, the tiles still appear to be in place, and there may not be any obvious signs of damage.
However, beneath the surface, a much more serious problem may already be developing.
The moment grout begins disappearing from a joint, water gains access to areas that were never intended to be exposed. Every swimming pool contains enormous hydrostatic pressure, and water naturally seeks the path of least resistance. Open grout joints provide exactly that pathway.
The longer these joints remain unrepaired, the greater the likelihood of water infiltrating beneath the tiled surface.
This is where a seemingly small grout problem can evolve into a major repair project.
When water penetrates through failed grout joints, it begins reaching the adhesive layer that bonds the tile to the pool substrate. Adhesives are designed to perform under wet conditions, but prolonged exposure to water migration, chemical attack, and constant saturation can gradually affect their performance.
Over time, the adhesive bond may begin weakening.
Initially, there may be no visible signs. However, experienced pool specialists can often identify the early warning signals. Tiles may begin sounding hollow when tapped. Small areas of movement may develop underfoot. Corners of tiles may begin lifting slightly.
Eventually, complete debonding can occur.
Once tiles begin detaching from the substrate, the repair process becomes significantly more complicated and expensive. Instead of simply replacing grout, the affected area may require tile removal, adhesive replacement, substrate preparation, waterproofing repairs, and complete reinstatement of the tiled finish.
For a residential pool, this can become a costly inconvenience. For a hotel or resort, it can become a maintenance nightmare.
Guest complaints begin increasing. Safety concerns arise. Sections of the pool may need to be closed off. Maintenance costs escalate rapidly. What could have been addressed through proactive grout replacement can eventually develop into a major restoration project.
Historically, repairing grout meant draining the entire pool. While this may sound simple, the reality is far different.
Draining a commercial swimming pool is a significant undertaking. Thousands of litres of water must be removed. The pool then requires cleaning, repairs, refilling, chemical balancing, and recommissioning before guests can use it again.
For hotels and resorts, every day the pool remains closed represents a potential loss of revenue and a reduction in guest satisfaction. This challenge becomes even more pronounced in destinations such as the Maldives.
The Maldives operates almost entirely on tourism. Resorts function year-round, welcoming guests from around the world every day of the year. Many guests specifically choose properties based on the quality of their swimming pools and aquatic facilities.
Closing a major pool for repairs during peak occupancy periods is rarely an attractive option. As a result, resort operators increasingly seek solutions that allow essential maintenance to be carried out without disrupting operations.
For many resort operators, the cost of repairing deteriorated grout extends far beyond the actual repair works themselves. The true cost often lies in the operational disruption that accompanies traditional pool maintenance methods.
In destinations such as the Maldives, where resorts operate throughout the year and guest expectations are exceptionally high, swimming pools are not merely recreational facilities. They are often among the most photographed areas of the property and play a significant role in the overall guest experience.
A guest choosing between two luxury resorts may be influenced by many factors, but beautifully maintained swimming pools consistently rank among the most important amenities, particularly for families, honeymooners and leisure travellers.
When a pool must be drained for conventional grout repairs, the financial implications can quickly become substantial.
Recent hospitality industry data indicates that luxury resorts in the Maldives commonly achieve average daily room rates ranging from approximately USD 800 to well over USD 2,500 per night, while ultra-luxury properties frequently exceed USD 3,000 per night. Occupancy levels at many premium resorts can range between 60% and 85% throughout the year. Source- Let’s Invest in Maldives
Consider a hypothetical luxury resort with 100 villas operating at 75% occupancy and an average room rate of USD 1,200 per night.
This equates to approximately USD 90,000 in room revenue generated every single day.
While closing a pool may not immediately result in all guests cancelling their reservations, it can impact guest satisfaction scores, online reviews, repeat bookings, and future revenue opportunities. In highly competitive hospitality markets, even a temporary reduction in guest experience can have long-term financial consequences.
For resorts that market themselves around their pools, overwater villas, wellness experiences, and luxury leisure facilities, placing a major pool out of operation for several weeks can create a challenge that extends well beyond the engineering department.
This is one of the primary reasons underwater grouting has become increasingly popular throughout the Maldives. Instead of draining the pool, closing facilities, and inconveniencing guests, underwater grouting allows repairs to be completed while the pool remains filled with water and operational.
At Da Vinci Ceramics, our divers typically commence work after guest operating hours, allowing restoration activities to take place discreetly during the night. By the following morning, guests can continue enjoying the pool as usual.
“A traditional grout repair may cost a resort a few thousand dollars. Closing a signature pool during peak season can potentially impact tens of thousands of dollars in guest experience value and revenue opportunities.”
For many resort operators, the ability to eliminate downtime is often just as valuable as the repair itself. This is where underwater grouting has changed the game.
Underwater grouting is a highly specialised process that involves restoring deteriorated grout joints while the swimming pool remains completely filled with water.
Rather than draining the pool, skilled technicians work beneath the surface, carefully removing failed grout and replacing it with specially formulated underwater epoxy grout.
While the concept sounds straightforward, the reality is anything but simple.
Working underwater introduces an entirely new set of technical challenges. Visibility is often reduced. Material handling becomes more difficult. Surface preparation requires specialised techniques. Every movement must be controlled and deliberate.
Unlike conventional grouting carried out above water, underwater grouting combines elements of commercial diving, tile restoration, material science, and underwater construction.
This is not a service that can be performed by ordinary tile installers. It requires specialist knowledge, specialist equipment, and specialist personnel.
The Da Vinci Ceramics Difference
At Da Vinci Ceramics, underwater grouting is performed by our own team of trained divers who possess both diving expertise and technical knowledge of tile restoration systems.
This combination is crucial.
Many divers possess excellent underwater skills but lack the understanding of tile systems and grout performance. Conversely, many tile specialists understand grouting but have no experience operating underwater.
Successful underwater grouting requires both skill sets working together. Over the years, our team has refined procedures that allow grout replacement to be carried out efficiently while maintaining the highest standards of workmanship.
Every project begins with a detailed assessment of the existing pool condition. Areas of grout loss are identified, substrate conditions are evaluated, and the most appropriate repair methodology is developed.
This meticulous planning stage is often what separates a successful project from one that experiences premature failure.
One of the key factors that makes underwater grouting possible is the material itself.
Traditional cement-based grouts are simply not designed for underwater application. They lack the necessary performance characteristics required for long-term submerged repairs.
For this reason, Da Vinci Ceramics utilises a specially formulated epoxy grout manufactured in Sri Lanka specifically for underwater applications.
This advanced material has been developed to perform in fully submerged conditions while providing exceptional durability and chemical resistance.
Unlike conventional grouts, the epoxy formulation creates an extremely dense and impermeable joint. It exhibits excellent resistance to pool chemicals, chlorinated environments, and saltwater conditions. Most importantly, it can be applied directly underwater without compromising its performance characteristics.
The result is a long-lasting repair solution that restores the integrity of the tiled surface while eliminating the need for costly pool closures.
Many people are surprised to learn just how meticulous underwater grouting actually is.
Every joint must be carefully prepared before new grout is introduced. Existing loose material must be removed. Contaminants must be cleaned away. Joint depths must be assessed. Surface conditions must be verified. Only after these preparatory stages can grout application begin.
The grout must then be carefully worked into the joints to ensure complete filling and proper adhesion. Unlike conventional grouting, where installers can simply wipe excess material away, underwater conditions require significantly greater precision.
The newly installed grout must then be allowed to cure properly. In most cases, a minimum curing period of approximately 24 hours is required before the next stages of work can proceed.
Once curing is complete, excess grout residue must be carefully removed from the tile surface. Remarkably, all of this work takes place underwater.
The level of patience, concentration, and technical skill required cannot be overstated.
One of the greatest advantages of Da Vinci Ceramics’ underwater grouting service is our ability to work around resort operations.
Rather than disrupting guests during the day, our divers typically begin work after the pool has closed for the evening.
While guests enjoy dinner, entertainment, or retire to their villas for the night, our teams quietly begin carrying out underwater restoration works.
By the following morning, guests can continue enjoying the pool as usual. There is no need to drain the pool. There is no prolonged closure. There is no significant disruption to resort operations.
For luxury hospitality properties, this operational flexibility is often one of the most valuable aspects of the service.
Over the years, Da Vinci Ceramics has successfully completed underwater grouting and pool restoration works for numerous leading resorts throughout the Maldives
Our portfolio includes prestigious projects such as JA Manafaru Maldives, Cinnamon Dhonveli Maldives, Cinnamon Hakuraa Huraa Maldives, Kudafushi Maldives, LUX Maldives, along with several ongoing resort developments and refurbishment projects.
The confidence these properties place in our services reflects the reliability, technical expertise, and specialist knowledge that underpin every project we undertake.
In an industry where guest satisfaction is paramount and operational downtime is costly, underwater grouting has become an essential maintenance solution.
Swimming pools represent substantial investments. Whether they belong to a luxury resort, an international hotel chain, or a private homeowner, protecting that investment requires proactive maintenance and specialist expertise.
Grout deterioration may seem insignificant at first glance, but the consequences of ignoring it can be severe. Water infiltration, adhesive degradation, tile debonding, and extensive restoration costs can all stem from something as simple as missing grout. Underwater grouting provides a practical, efficient, and technically advanced solution to this problem.
At Da Vinci Ceramics, we are proud to have pioneered this specialised service, helping clients restore and protect their pools without the inconvenience of draining them.
The next time you admire a beautifully tiled swimming pool, remember that some of the most important work happens beneath the surface. And when it comes to protecting that investment, underwater grouting may very well be the difference between a minor repair today and a major restoration tomorrow.