🏗️ Sub Service — Waterproofing

Slab Waterproofing
in Sri Lanka

Expert concrete slab waterproofing solutions for residential, commercial and industrial properties. Long-lasting, affordable, and certified — protecting your roof slab, terrace and overhead deck from water seepage permanently.

Flat Roofs Terraces & Decks Overhead Slabs New & Existing

Service Overview

Reliable Slab Waterproofing
Services in Sri Lanka

Looking for professional slab waterproofing services in Sri Lanka? We offer long-lasting, affordable, and expert concrete slab waterproofing solutions covering residential, commercial, and industrial properties across the island.

A leaking roof slab is one of the most common and damaging problems faced by Sri Lankan buildings. Our tropical climate — with monsoon rains exceeding 2,500mm annually — means that poorly waterproofed slabs degrade rapidly. Water penetrating the slab corrodes reinforcement steel, weakens concrete, causes ceiling damage, and drives up repair costs exponentially over time.

We apply certified Supercrete New Zealand cementitious and membrane waterproofing systems directly to the concrete slab surface, creating a permanent, seamless barrier that moves with the structure without cracking.

What We Waterproof

Slab Types We Cover

Flat roof slabs — the most common application in Sri Lankan buildings
Terrace and balcony decks — including tiled and untiled terraces
Overhead / suspended slabs — between floors where water tracks down
Podium slabs and car park decks
Green roofs and rooftop gardens — root-resistant membrane systems
Swimming pool surrounds and pool shells
Water tank roofs and retaining slabs

Our Process

How We Waterproof Your Slab

Free Site Inspection

Our certified specialist visits your property, assesses the slab condition, identifies existing leaks, and recommends the right system for your specific situation — at no cost.

Surface Preparation

We thoroughly clean and prepare the slab surface — removing all loose material, contamination and existing failed coatings to ensure maximum adhesion of the new system.

Crack Repair & Detailing

All cracks, joints, pipe penetrations and vulnerable areas are treated with appropriate repair mortars and reinforcement tape before the main application.

Waterproofing Application

The certified Supercrete NZ system is applied in the specified number of coats, at the correct thickness and coverage rate — exactly as the manufacturer requires for warranty validity.

Quality Check & Warranty

Once cured, we inspect the application and issue your 10-year written warranty certificate — your permanent protection document.

Product Systems

Certified Supercrete Systems
We Use for Slabs

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Duraproof SB 40

Single-part acrylic cementitious waterproof render. Ideal for concrete and masonry roof slabs.

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Duraflex Ultra

Titanium-modified, UV-stable 2-part flexible slurry. For movement-prone slabs and terraces.

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Duraflex 100

Highly flexible 2-part system with 100% elongation. UV resistant and foot-trafficable.

Common Questions

Slab Waterproofing FAQs

How do I know if my slab needs waterproofing?▼

Common signs include damp patches or water stains on ceilings, visible cracks in the slab, rust stains (from corroding rebar), peeling paint, and musty odors. Even if you don't see active leaking, old slabs may have degraded protective coatings that need renewal before damage begins.

Can you waterproof a slab that already has tiles?▼

In some cases, yes — injection systems and negative-side applications can work over tiled surfaces. However, for the most effective and long-lasting result on a flat roof, we recommend applying the waterproofing system directly to the concrete substrate before any final finishes are laid.

How long does the application take?▼

For a typical residential roof slab (100–200 sqm), the application takes 2–4 days including surface preparation and curing time. Larger commercial projects are scheduled according to access, weather conditions and client requirements.

Get Your Slab Waterproofed Today

Free inspection — certified application — 10-year written warranty. Call or WhatsApp us now.

🛡️ Free Slab Inspection 📞 Call Us Now 💬 WhatsApp

Slab Waterproofingin Sri Lanka

Reliable Slab WaterproofingServices in Sri Lanka