In Bangladesh, roof leakage is not just a seasonal nuisance—it is one of the most persistent and costly building failures. A single leak can trigger a chain reaction: damp ceilings, peeling paint, electrical risk, mold growth, corrosion of reinforcement, and eventually structural distress. While most owners treat leaks as “a repair problem,” the bigger truth is this: roof leakage is usually a design + detailing + system selection failure—and the cost of repeated repairs almost always exceeds the cost of doing prevention properly.

At the center of the Bangladesh rooftop story is a traditional practice known locally as “Jol Chad”—a method that many people believe “does the waterproofing.” In reality, Jol Chad is primarily a slope/insulation layer and it becomes waterproof only when executed and maintained perfectly, which is rare in real‑world conditions. 

 

Why roof leakage is so common

Flat RCC roofs dominate Bangladesh construction. Unlike sloped roofs where water runs off quickly, flat roofs are exposed to ponding water, thermal movement, and long wet cycles, making them highly vulnerable to seepage and crack‑based leakage. Traditional roof systems also suffer from weak detailing around:

• rainwater outlets and khals
• parapet wall junctions
• pipe penetrations and sleeve cutouts
• construction joints and cold joints 

When water stagnates and finds micro‑cracks, it enters the slab, causing dampness and progressive damage. Traditional brickbat-based methods were developed to address this—but they don’t always match today’s building usage, load demands, and maintenance realities. 

 

The Bangladesh “Jol Chad” practice: what it is and why it became popular

Jol Chad is widely used in Bangladesh as a rooftop treatment to create slope and thermal comfort, traditionally achieved using brick pieces laid in pattern followed by screeding. The objective is to provide:

• a fall/slope to drain, so water does not stagnate; and
• some thermal insulation, because brick and mortar layers reduce direct heat transfer

In the broader South Asian construction ecosystem, this approach is also known as Brick Bat Coba, described as laying brickbats on the roof and grouting with mortar while forming slope to drain rainwater. 

So yes—Jol Chad has a rational logic: create slope + add insulation. But the key mistake is assuming the Jol Chad layer itself is “the waterproofing.” That assumption is where many buildings start failing.

 

Why Jol Chad is now an “archaic waterproofing expectation” (and its major cons) 

Jol Chad is heavily workmanship‑dependent and introduces structural and maintenance drawbacks—especially in Bangladesh’s climate and rooftop usage patterns:

 

1) It adds significant dead load to the roof

Brickbat coba methods are widely noted to add unwanted/extra load when used as terrace waterproofing. 

In today’s buildings—where roofs may already carry tanks, solar supports, service equipment, and frequent foot traffic—extra dead load becomes a real design and durability concern.  

 

2) It is difficult to repair properly once it fails

Traditional guidance notes that brickbat waterproofing becomes hard to repair—often requiring redoing large areas when water penetrates the system. 

That means owners get trapped in a cycle: leak → patch → leak again → partial removal → rework. 

 

3) It relies on perfect slope, perfect compaction, and perfect curing 

Brickbat systems require careful preparation, correct slope formation, proper curing and protection layers to succeed. 

In real buildings, slopes often get compromised (by later works, settlement, clogging of drains), and curing is not consistently controlled, increasing cracking risk. 

 

4) It can hold moisture and create hidden seepage pathways

If water penetrates the topping and reaches porous layers, it can migrate laterally before showing inside, making leak detection difficult and expanding damage footprint. Traditional descriptions emphasize the layered nature of these systems (brickbats + mortar + protective coat), which can become vulnerable if not sealed and detailed correctly.  

 

5) It confuses “insulation/slope” with “waterproofing”

Even modern commentary on Jol‑Chad frames it strongly as heat insulation + slope-to-drain, not inherently as a high‑performance waterproofing membrane.  
That’s why, in practice, many roofs with Jol Chad still leak—because insulation layers do not automatically become waterproof barriers.

 

Cost of repair vs. cost of prevention: the math most owners ignore

Reactive repair 

• Leak appears → local patching → repainting interior ceiling 
• Repeat every monsoon
• Increasing damage area and increasing repair frequency
• Indirect costs: tenant complaints, production disruption, damaged inventory, electrical risk

This approach is deceptively “cheap” in year one, but expensive over 5–10 years because it never fixes the system. 

Preventive waterproofing 

• Treat the roof as a system: substrate repair + proper waterproofing membrane + detailing + protection/topcoat
• Control ponding and ensure drains function
• Build predictable maintenance cycles rather than emergency fixes 

Even traditional sources acknowledge that roof leakage can come from porous concrete, cracks, and joints, and that waterproofing should be treated as a proper barrier system—not a casual topping.

Bottom line: Prevention is not “extra cost.” It is a risk-control investment that avoids repeated interior repair costs and operational disruption.

The modern, reliable alternative: membrane-based waterproofing systems

Unlike brickbat slope systems, modern waterproofing relies on a continuous membrane that bridges micro‑cracks and resists water ingress. International manufacturers describe roof waterproofing as a “system” involving membranes + accessories + detailing, and emphasize that waterproofing should be applied on a sloping substrate to ensure durability.  

Common membrane categories used on roofs include:

• Acrylic waterproofing (water-based, UV-stable, easier application)
• PU (polyurethane) liquid membranes (high elasticity, crack-bridging, durable)
• Cementitious waterproofing (cement + polymer, good bonding to concrete, often under protective layers/tiles)  

Each has its place depending on exposure, ponding risk, movement, and service traffic.

How Asian Paints solves this problem in Bangladesh 

Asian Paints positions itself not as a “product supplier,” but as a partner in moving buildings away from Jol Chad-era leakage cycles to system-based roof protection. This is especially relevant in Bangladesh, where Jol Chad is still commonly expected to perform waterproofing by itself.  

1) When you need a practical, UV-stable exposed roof solution: Acrylic Waterproofing

For many exposed RCC roofs—especially where ease of application and UV stability matter—acrylic waterproofing membranes provide a seamless protective coating suitable for sun-exposed terraces and rooftops when applied in multiple coats. Comparative discussions describe acrylic waterproofing as liquid-applied by brush/roller/spray and forming a seamless membrane after drying, typically built up in multiple coats. 

Why it fits Bangladesh roofs:

• Easier application logistics than dismantling Jol Chad layers 
• UV resistance suitable for exposed roofs 
• Faster adoption for retrofit projects with limited shutdown windows

2) When crack-bridging and long-term elasticity are critical: PU Waterproofing

PU liquid membranes are widely recognized for superior flexibility and durability compared to many other options, making them effective where structural movement and crack bridging are expected.  

Why it fits roofs that keep cracking after Jol Chad:

• Elastomeric membrane behavior helps accommodate 
• Seamless system reduces weak joints that often fail in traditional methods 

3) When you want robust bonding to concrete (often under screed/tiles): Cementitious Waterproofing 

Cementitious systems are described as cement-and-polymer-based coatings that adhere effectively to concrete and masonry, frequently used where compatibility with cement-based substrates is important. 

Why it fits buildings transitioning from traditional construction practices:

• Familiar cement chemistry + improved performance through 
• Suitable under protective screeds or finishes where required 

A simple decision guide 

If your roof has frequent ponding, repeated cracking, or high leakage history: 
→ prioritize PU waterproofing for crack-bridging and durability

If your roof is exposed and you want a practical, UV-stable solution with easier application: 
→ consider Acrylic waterproofing systems

If your roof will be protected with screed/tiles or needs cement-compatible solutions: 
→ use Cementitious waterproofing with correct detailing and protection

And in all cases: waterproofing must be treated as a system, not a single layer—because weak points are almost always at joints, outlets, and penetrations. 

 

Conclusion: Stop paying for the same leak every year

Jol Chad (brickbat + screed) became popular because it helped create slope and thermal comfort, but treating it as “the waterproofing” is an outdated expectation that often leads to repeat failures—especially under Bangladesh’s rainfall and maintenance realities.

The smarter path is to keep what works (slope and drainage discipline) and upgrade what fails (waterproofing layer) using membrane-based systems. Asian Paints enables this shift through acrylic, PU, cementitious and integrated roof waterproofing systems, supported by a system approach that focuses on durability, correct detailing, and lifecycle value—not just patch repairs.

Because the cheapest leak is the one you prevent—not the one you repair repeatedly.