Waterproofing Contractor in Roodepoort | Roof & Slab Specialists

Flat Roofing Services Menu

Explore our full range of roofing solutions, from repairs to complete replacements, tailored to South African conditions.

✔ Flat Roof Waterproofing Services

Cementitious, acrylic, torch-on, or hybrid membrane systems tailored for flat concrete roofs. Includes slope correction and engineered drainage.

✔ Leak Detection Services

Advanced moisture tracking and roof leak investigations using real-world diagnostics. We pinpoint the origin before any repairs begin.

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✔ Roof Inspection Services

Engineer-approved roof assessments for structural integrity, moisture penetration, and storm damage, ideal for property owners, insurance claims, and resale readiness.

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At Environmental Pro Construction, we provide expert flat roof and slab waterproofing services in Roodepoort and greater West Rand. Our engineer-certified systems are specifically designed for South African weather extremes, offering long-lasting protection against moisture ingress, thermal movement, cracking, and substrate deterioration.

Whether you’re dealing with a residential slab, commercial flat roof, or exposed concrete balcony, we carefully match the right method to your structure. From torch-on bitumen and polyurethane systems to screed encapsulation, every solution is designed to protect your property from recurring damage, not just delay it.

We never apply surface coatings that simply hide the issue. Instead, we use membrane-based, deep-bonding waterproofing systems that integrate with the substrate to resist UV exposure, ponding water, and hot-cold expansion cycles common in Roodepoort’s climate. Every project includes qualified workmanship, SABS-compliant materials, and when needed, a Pr.Eng sign-off to ensure peace of mind and code compliance.

Reliable Roof & Slab Solutions

Our mission is simple: deliver low-maintenance, leak-free slab protection that stands the test of time.

Common Flat Roof Issues in Randburg

Ponding water due to poor screed fall

Cracked or failing membrane

Water seeping into ceilings or slab joints

Flat roofs often suffer from inadequate drainage caused by poorly executed screed slopes. This leads to ponding water that accelerates membrane degradation and increases the risk of roof leaks, especially after storms. Over time, standing water can weaken the slab surface and promote algae or structural wear beneath the waterproofing system.

Visible cracks at parapet wall junctions are a key failure point in aging slab waterproofing. When UV exposure and thermal movement degrade the membrane, water penetrates behind the system, leading to damp walls, blistering paint, and internal ceiling damage. These cracks often go unnoticed until water starts showing inside, which is why early detection is critical in mixed commercial-residential zones.

Here, water intrusion through slab joints caused widespread ceiling damage and rusting of steel elements inside the cavity. This is often the result of a failed membrane above or compromised expansion joints. Without proper slab encapsulation, these issues can spread, causing costly repairs for sectional title properties and body corporates.

Exposed rebar or concrete spalling

Blocked outlets or poorly sealed scuppers

Heat expansion and UV damage

This photo highlights UV-degraded membrane peeling away from a high-traffic flat roof. During hot summers, membranes can become brittle and shrink, especially on poorly insulated slabs. Without reflective coating or expansion detailing, such damage spreads rapidly across parapets and slab edges. Our high-performance waterproofing systems are designed with heat expansion tolerances and full UV resistance.

Here we found a drainage outlet (scupper) with a compromised seal and trapped debris. This creates backflow pressure under the membrane, often causing bubbling or lifting. In high-density commercial zones, blocked outlets are a recurring culprit behind interior flooding and damaged slab systems. EPC ensures that every outlet is checked, resealed, and detailed with full water-flow verification.

This slab shows visible signs of spalling, where waterproofing failure and prolonged moisture penetration caused the concrete cover to break off, exposing steel rebar to the elements. Once exposed, rebar begins to rust, expand, and break apart the concrete further. In older industrial and mixed-use areas, this type of slab deterioration is common where maintenance has been delayed or membranes are past their design life.

Leak Detection Services

Prevent damage before it spreads, engineer-trusted solutions for every leak.

Water intrusion is one of the most destructive, and costly, issues South African homeowners face. At Environmental Pro Construction, we go beyond surface patch-ups. Our leak detection services are engineered to identify the source accurately and resolve the issue with long-term structural integrity in mind.

✅ Advanced Leak Tracing

We don’t rely on guesswork. Our specialists use advanced diagnostic technology, including thermal moisture mapping, penetrative sensors, and internal seepage tracking, to pinpoint the exact leak source before any invasive work begins.

This ensures:

• No unnecessary slab removal

• Accurate root-cause identification

• Faster, more cost-effective repairs

Whether the leak originates under tiles, behind parapet walls, or within an old concrete slab, we uncover it with precision so you’re never paying for guesswork.

✅ Prompt Repair Execution

Once a leak is located, we don’t delay, we act. Our experienced crew mobilizes quickly to implement the most suitable engineer-backed repair strategy, sealing and rectifying the issue using SABS-compliant waterproofing systems tailored to the site condition.

We select the repair method based on:

• Substrate condition and material compatibility

• Whether the area is internal, exposed, or tiled

• Access and moisture level analysis

From under-slab repairs to parapet reseals or concealed roof cavity fixes, our focus is on long-term reliability, not surface patchwork. Every repair is done with full accountability, protecting both your structure and investment.

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✅ Engineer-Certified Inspections

Every advanced detection project includes a formal inspection report outlining the precise cause, condition, and risk level associated with the leak or structural concern. These reports are written in clear, professional language and backed by photos, findings, and repair recommendations.

For high-risk or insurance-sensitive properties, we offer an engineer-certified report (Pr.Eng) on request, ideal for:

• Structural warranty claims

• Real estate due diligence

• Legal disputes or insurance authorization

All findings are documented with integrity and traceability, giving you peace of mind, proof of due diligence, and a clear path forward for compliant repairs.

• Tile & metal roofs

• Flat concrete slab roofs

• Ceilings, cornices & structural joints

• Gutters, valleys, flashings & skylights

• Parapet walls and rooftop plumbing areas

✅We Detect Leaks In:

Flat Roof Waterproofing

Protect Your Slab from Leaks, UV Damage & Structural Deterioration

Flat concrete roofs are common across Gauteng’s homes, offices, and commercial buildings. but they're highly vulnerable to ponding water, UV degradation, and thermal stress. At Environmental Pro Construction, we install certified waterproofing systems tailored for local climate extremes and long-term resilience.

Specialized Flat Roof Systems We Offer:

✅ Torch-On Membrane Waterproofing (Bitumen-Based)

A dual-layer system applied with controlled heat to form a thick, seamless, and durable waterproof barrier. Commonly used on large flat roofs, concrete decks, and exposed slab rooftops.

✅ Liquid Rubber & Polyurethane Coatings

• Installed with Precision Heat Application – Using a gas torch, the bitumen membrane is bonded to the substrate layer by layer, forming a watertight seal over the surface.

• Reinforced and UV-Stabilized Finish – Mineral-surfaced membranes add durability and UV resistance, making them ideal for high-sun exposure and long-term rooftop protection.

• Engineered for Longevity – When correctly installed and maintained, this system offers reliable performance for 8–12 years or more, even in challenging Gauteng weather conditions.

Highly flexible, cold-applied systems suitable for irregular shapes, difficult penetrations, and areas with movement or vibration. These coatings offer excellent elongation and crack-bridging ability.

• Seamless Application on Any Geometry – Perfect for roofs with HVAC penetrations, balustrade bases, skylights, and tricky detailing that other systems struggle to seal.

• Extreme Flexibility & Crack Bridging – With elongation properties exceeding 400%, these coatings can stretch with thermal expansion and contraction, reducing the chance of future failure.

• Low-VOC, Cold-Applied & Durable – Installed without heat, they cure into a fully bonded membrane that resists water ponding, UV damage, and chemical exposure.

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Used for both positive and negative waterproofing on concrete slabs, balconies, tanking, and retaining structures.

✅ Acrylic Roof Coatings

• Blended On-Site with Specialized Additives – Mixed manually using spades or mechanical mixers, combining cement-based compounds with polymers or waterproofing agents for enhanced flexibility and adhesion.

• Applied by Hand or Steel Trowel – Spread and compacted manually over the prepared concrete surface, ensuring tight bonding and reduced porosity. Applied in layers depending on system type (e.g. slurry vs. render-grade).

• Forms a Crystalline Waterproof Barrier – Reacts chemically with moisture and cement particles to seal hairline cracks and create a breathable, watertight finish from both the positive (top) and negative (underside) side.

Flexible, UV-resistant coatings commonly used on non-critical flat roofs, concrete decks, or maintenance overlays.

• Applied by Roller or Brush in Multiple Layers – Typically installed in 2 to 3 coats, ensuring full coverage and consistent film thickness. Each layer is allowed to cure before the next is applied.

• Water-Based and Environmentally Friendly – Low-VOC and non-toxic, making it suitable for schools, clinics, and Eco-sensitive environments where solvent-based systems may not be ideal.

• Forms a Seamless, Flexible Skin – Bonds directly to concrete, plaster, or primed metal. Provides elongation to bridge minor cracks and withstand light movement, though not ideal for high-traffic or ponding areas.

✅ Cementitious Waterproofing Systems

✅ Sloped Screed & Drainage Correction

• Improves membrane performance by eliminating back-flow and pressure buildup at drainage points.

• Enables precise compatibility with box gutters, outlets, and drainage systems.

• Helps prevent internal damp migration caused by long-term surface saturation.

• Engineered slope designs ensure proper drainage flow, especially critical for flat or low-pitch roofs.

• Each slope is calculated to redirect water away from critical joints, reducing the risk of pooling or seepage.

• Ideal for older slabs or poorly pitched surfaces where water stagnation has caused long-term damage.

Water pooling shortens lifespan. We install screeds to improve gradient and reduce pressure on waterproofing systems.

Engineer-Certified Systems

For larger commercial installations or critical residential repairs, we provide detailed waterproofing reports, signed off by a professional structural engineer (Pr.Eng) when needed. Full SANS 10400 compliance guaranteed.

✅ Common Applications:

• Residential flat concrete roofs

• Exposed balconies & verandas

• Rooftop parking decks

• Warehouses & commercial blocks

• Parapet junctions & slab-wall transitions

What Our Flat Roof & Slab Waterproofing Covers

Every slab presents its own set of challenges. That’s why our approach is tailored, whether it's a simple patch-up or a full re-waterproofing with drainage correction, EPC delivers engineered solutions that meet SANS 10400 compliance and withstand South Africa’s harshest conditions.

Here’s what our flat roof and slab waterproofing service typically includes:

• Membrane Removal & Reapplication – Stripping off aged or damaged waterproofing and reapplying high-performance torch-on or liquid membrane systems, depending on slab structure and traffic exposure.

• Sloped Screed Rebuilding – Correcting poor falls that cause water pooling and slab saturation. Our screeds are built to SABS fall regulations for effective drainage to scuppers or outlets.

• Joint & Crack Sealing – Injecting or sealing slab cracks and construction joints using flexible polyurethane or epoxy-based systems that resist movement and water ingress.

• Outlet & Scupper Reconfiguration – Repairing or replacing blocked outlets and poorly placed scuppers that often cause membrane failure and standing water.

• Surface Encapsulation – Protecting exposed concrete surfaces with UV-resistant coatings and breathable moisture barriers to extend service life and reduce maintenance.

• Thermal Movement Detailing – Accommodating expansion and contraction in concrete slabs through proper membrane detailing, especially at wall junctions, parapets, and corner joints.

• Insulated Slab Waterproofing (Optional) – For habitable or commercial roofs, we offer insulation board integration beneath membranes to reduce heat transfer and improve energy efficiency.

All systems are installed with engineer oversight and available with a written report for compliance or body corporate assurance.

All systems are installed with engineer oversight and available with a written report for compliance or body corporate assurance.

What Really Affects Flat Roof & Slab Waterproofing Costs in Roodepoort

Older homes, commercial buildings, and sectional title properties in Roodepoort often include aging slabs, failing torch-on membranes, or non-compliant detailing, each of which requires a different approach and level of expertise.

Common Factors That Influence Waterproofing & Slab Repair Pricing

Waterproofing a flat roof or exposed slab isn’t a one-size-fits-all task, the cost depends on slab condition, existing failures, and specialist waterproofing methods required. Whether you're dealing with deteriorated membranes, exposed rebar, or poor drainage design, EPC breaks down the real factors that influence pricing, so you can make clear, informed decisions with no surprises.

Concrete flat slabs, inverted slabs, and lightweight screeded roofs each require different systems. Some can be repaired with direct membrane overlays; others may need mechanical prep, priming, or total reinforcement.

✅ Extent of Moisture Damage:

Surface cracks are manageable, but if there’s deep ingress into slab joints, ceiling cavities, or steel reinforcement, costs increase due to the need for drying, patching, or re-encapsulation.

✅ Fall, Drainage & Access Challenges:

Water pooling is often due to poor screed falls or blocked scuppers, which may require sloped screeding, sump creation, or core drilling. Complex access or confined flat roofs will impact setup time and equipment use.

✅ Specialist Systems Involved:

Some projects require torch-on bitumen, polyurethane coatings, root barriers, or engineer-specified membranes. Costs vary depending on system compatibility and longevity expectations.

✅ Property Age & Structural Risks:

Older properties may show spalling concrete, UV-degraded surfaces, or lack of expansion joint sealing, all of which require more than just surface treatment to ensure long-term integrity.

✅ Roof or Slab Type:

⭐️⭐️⭐️⭐️⭐️ Candice Marx – Randburg

“After dealing with three different contractors who couldn’t sort out my roof issues, I came across EPC. Their team were professional, knew exactly what they were doing, and got the job done properly. No shortcuts, no excuses, just solid workmanship.
They handled everything seamlessly and kept me in the loop the whole time. If you need a reliable contractor, I’d definitely recommend them.

What Homeowners Say About Our Roof Repair Work

⭐⭐⭐⭐⭐ Ethel Kotze – Randburg

A big thank you to Frankie for the fantastic renovation work at our home. He really knows his craft and guided us perfectly, even as we made several changes from our original plan. His expertise and attention to detail made the whole project smooth, and we couldn’t be happier with the results. Highly recommend!

⭐⭐⭐⭐⭐ Santie Van Niekerk – Roodepoort

I would like to say thank you to Frankie and his team! As an elderly woman residing alone, I was distressed when my roof began leaking at quite a few places during the heavy rains. My daughter recommended EPC, and from my initial call, they were attentive and understanding. They scheduled an inspection, clearly explained the necessary repairs, and ensured I was comfortable throughout the process. Their professionalism and care have given me peace of mind, and I highly recommend EPC to others in need of roofing services.

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We’re proud to serve homeowners across Krugersdorp, Noordheuwel, Monument, and Rangeview, plus surrounding areas like Randburg and Roodepoort. These reviews reflect the real experiences of clients who trust us for honest pricing, engineer-certified solutions, and no-nonsense repairs.

Typical Slab Waterproofing Costs in Roodepoort

Every slab is different, and so is the system required to protect it. At Environmental Pro Construction, we assess each roof’s structure, slope, exposure, and surface condition before proposing a waterproofing method that’s engineered to last.

Here’s what our Roodepoort clients can typically expect:

✅ Torch-On Membrane System

R295–R315 per m²

• Ideal for sound slabs with proper fall

• UV-stabilized mineral finish

• Gas-based application with full lap sealing

✅ Torch-On with Screed Fall Correction or Primer Treatment

R345–R395 per m²

• Includes lightweight slope screeding or substrate binding

• Used when ponding, blistering, or poor falls exist

✅ Structural Repair + Multi-Layer Reinforced System

From R425 per m²

• For aged slabs with spalling, cracks, or exposed steel

• May include concrete sealing, joint reinforcement, and secondary membrane layers

✅ Polyurethane or Acrylic Waterproofing (Flexible Systems)

From R350 per m²

• Applied where torch-on is unsuitable (e.g. over occupied areas or detail-heavy slabs)

• Fast-curing, UV-stable, and traffic-resistant

• Excellent for balconies, podium slabs, and parapet junctions

We only recommend systems that are compatible with the substrate and long-term use case. If we wouldn't use it on our own property, we won't offer it.

Pricing reflects full system integrity, not patch-based jobs or diluted coatings.

💡 Why Property Owners Choose Environmental Pro Construction

When it comes to flat roof and slab waterproofing, trust isn’t optional, it’s everything. At Environmental Pro Construction (EPC), we don’t rely on surface-level solutions or shortcuts. Every project is approached with technical precision, full compliance with SANS 10400 building law, and professional engineer oversight to ensure your roof performs under pressure, not just today, but for years to come.

This is why property owners, sectional title bodies, and commercial clients across Roodepoort and the West Rand rely on us to safeguard their investments.

• ✔ Engineer-Guided Repairs

  
  All complex repair work is carried out under the oversight of a certified engineer where required, ensuring SANS 10400 compliance, structural safety, and legal peace of mind.

• ✔ Transparent Pricing – No Hidden Costs

  
  We issue detailed quotes upfront with clear scope and pricing. You’ll never find surprise charges, unnecessary up-sells, or vague invoices.

• ✔ Fast Turnaround, Clean Workmanship

  
  We respond fast, work neatly, and respect your property. Our goal is minimal disruption with maximum results, every time.

• ✔ Leak Detection Experts

  
  From thermal moisture scans to roof inspections, we identify the actual source of the problem, not just where the water shows up. That’s how we prevent repeat issues.

• ✔ Guaranteed Work Backed by Local References

  
  We stand behind our repairs. You’ll receive workmanship guarantees, documented photos, and references from local property owners we’ve helped.

This is roofing repair done right, the first time.

Let us restore your roof’s performance and your confidence in it.

Areas We Serve for Flat Roof Repairs

Whether you're dealing with an older concrete slab in Discovery, ponding water in Constantia Kloof, or structural deterioration in Florida Hills, our team delivers precision-built roofing solutions that comply with South African codes and hold up under real-world pressure.

• Florida & Florida Hills

• Helderkruin

• Weltevreden Park

• Constantia Kloof

• Discovery

• Wilropark

• Horison View

• Kloofendal

• Roodekrans

• Surrounding areas in the West Rand

We specialize in comprehensive flat roof repairs and waterproofing across Roodepoort, backed by engineer supervision, formal SLAs, and a proven track record of long-term performance, trusted by both residential and commercial clients.

At Environmental Pro Construction, we provide engineer-certified flat roof and slab repairs throughout Roodepoort and surrounding West Rand suburbs. Our systems are SABS-compliant and built to withstand Gauteng’s harshest conditions, from seasonal thunderstorms to intense summer heat.

Areas We Serve for Flat Roof & Slab Repairs in Roodepoort:

Contact Us for Roofing Solutions

Have a question or need a certified roof inspection?

Our team is ready to help with clear answers, structural expertise, and quick turnaround.

🤔 Frequently Asked Questions – Slab & Flat Roof Waterproofing in Roodepoort

1. Why are flat roofs and slabs so prone to leaks?

Unlike pitched roofs, flat concrete slabs and low-slope roofs don’t drain water quickly. This leads to standing water, hairline cracks, and waterproofing breakdown, especially after heavy summer storms or temperature shifts. Without proper membranes and drainage, leaks are inevitable.

2. What is the best waterproofing method for a concrete slab?

We recommend a torch-on bitumen membrane or liquid-applied rubberized system, depending on slope, exposure, and substrate condition. Each slab is unique, so we assess for UV, temperature expansion, and historical damage before recommending the right solution.

3. How long does flat roof waterproofing last?

Our systems last between 5 and 20 years, depending on the material and maintenance.

• Torch-on membrane: 10–20 years

• Liquid polyurethane: 5–10 years

• Cementitious slurry (for balconies or screed): 5–8 years

All systems come with a workmanship and material warranty, backed by engineering when required.

4. How much does flat roof waterproofing cost in Roodepoort or Randburg?

Pricing varies, but expect:

• From R2,800 to R5,000 per 10m² for torch-on or liquid systems

• Complex slab repairs or re-pitching: case-by-case

All quotes include surface prep, priming, material, and labour. No hidden fees, ever.

5. Do you provide waterproofing certificates or compliance documents?

Yes, all major flat roof or slab waterproofing jobs are backed by an engineer-issued report or compliance sign-off, if requested. Ideal for insurance, resale, or municipal compliance.

6. How do I know if my waterproofing has failed?

Signs of failure include:

• Visible bubbling or blistering of the surface

• Ceiling stains and moisture seepage

• Soft or crumbling spots on the slab

• Hairline cracks or lifting membrane edges

💡 We offer free slab inspections to detect early signs before damage worsens.

7. Do you waterproof under floor screeds or tiles?

Yes. We offer pre-tile waterproofing for balconies, terraces, and concrete decks, ensuring long-term protection even beneath tiled or screeded finishes.

8. How soon can work begin after I accept a waterproofing quote?

Typically within 2 to 3 working days, weather permitting. In emergencies, we offer same-day sealing or temporary waterproofing to prevent damage before full application.

🔄 Related Roofing & Waterproofing Services

• Roof Repairs for Leaks & Slab Cracks in West Rand

• Full Roof Replacements for Aged Flat Roofs

• Roof Maintenance Plans to Extend Waterproofing Lifespan

• Our Flat Roof & Balcony Waterproofing Projects