- What it is
- Cement-based waterproofing coatings (flexible polymer-modified or crystalline) that bond to concrete and masonry.
- Best for
- Wet areas, concrete water tanks, swimming pools, basements (internal) and plant rooms.
- Key benefit
- Strong bond to damp concrete and a tile-ready surface.
- Finish
- Usually covered by tiles, screed or render
- Where we work
- Dubai, Abu Dhabi, Sharjah, Ajman, Umm Al Quwain, Ras Al Khaimah and Fujairah
- Next step
- Free site inspection and a written, itemised quotation
Cementitious waterproofing in Dubai for water-retaining and wet areas
ESA Technical Services LLC is a Dubai-based technical services company, established in 2006, specialising in GRP works, waterproofing, insulation and installation across the UAE. Cementitious waterproofing in Dubai is our go-to system for bathrooms, kitchens, pools and concrete water tanks.
Cementitious systems are chemically similar to the concrete they protect, so they bond strongly, even to damp substrates, and provide an excellent base for tile adhesives. For concrete water tanks, products approved for potable water contact are available, which is why these systems are common in UAE buildings.
What is cementitious waterproofing?
Cementitious waterproofing is a cement-based coating that forms a watertight layer on concrete or masonry. Polymer-modified (two-component) versions stay flexible and bridge fine cracks. Crystalline versions react with moisture and free lime in the concrete to form insoluble crystals that block capillaries within the concrete itself.
Flexible polymer-modified coatings suit wet areas, tanks and pools, where slight movement is expected and tiles go on top. Crystalline systems suit below-grade and water-retaining concrete, where they can be applied from the positive or negative side. Many products claim the ability to self-seal hairline cracks as moisture reactivates the crystals, within limits stated by the manufacturer.
When do you need cementitious waterproofing?
These are the signs and project triggers we see most often on UAE sites:
- Bathrooms and kitchens. Under tiles, in showers, around floor drains and pipe penetrations
- Concrete water tanks. Underground and rooftop concrete tanks for potable or fire water
- Swimming pools and water features. Before tiling, and when refurbishing leaking pools
- Basements (negative side). Internal waterproofing where the outside can't be reached
- Plant rooms and AC balconies. Areas with regular water on the floor
Our step-by-step cementitious waterproofing process
Substrate check
Concrete must be sound and clean. We remove laitance, oil, curing compounds and loose material, and check for leaks or active water.
Repair and preparation
Honeycombing and tie holes are repaired, and active leaks are plugged with fast-setting compounds. Coves are formed at wall-floor junctions.
Pre-wetting
The surface is dampened to saturated-surface-dry so the cementitious coating doesn't lose water and crack as it cures.
Reinforcing details
Corners, joints, drains and pipe penetrations receive reinforcing tape or fabric embedded in the first coat.
First coat
The coating is mixed to manufacturer's instructions and applied by brush, trowel or spray at the specified rate.
Second coat
Applied at right angles to the first once it has set, to build total thickness and eliminate pinholes.
Curing
The coating is protected from fast drying (sun, wind, heat) and cured as the data sheet specifies. This matters especially in UAE summers.
Flood or fill test
Wet areas are flood-tested and tanks or pools fill-tested before tiling or commissioning.
Technical specifications
Values below are typical ranges. Final specifications are confirmed per project from drawings, operating conditions and the manufacturer's technical data sheets.
| Parameter | Typical specification |
|---|---|
| System types | Two-component polymer-modified (flexible); crystalline (penetrating) |
| Typical thickness | Flexible systems often ~2–3 mm in 2 coats; crystalline per coverage rate |
| Crack bridging | Per manufacturer (flexible systems); crystalline self-sealing of hairline cracks within stated limits |
| Potable water | Use products approved for drinking-water contact |
| Reference standards | EN 1504-2 (surface protection), EN 14891 (under tiles), manufacturer data |
| Details | Reinforcing tape at corners, joints, drains and penetrations |
| Testing | Flood test (wet areas) typically 24–48 h; fill test for tanks/pools |
Materials and methods
- Polymer-modified cementitious coatings: two-component powder and liquid polymer systems
- Crystalline waterproofing: slurry coats or dry-shake treatments per manufacturer
- Waterproofing tapes and collars: for movement joints, corners and drains
- Plugging and repair mortars: fast-setting compounds for active leaks and defects
Benefits of cementitious waterproofing
Bonds to concrete
Chemically compatible with the substrate, giving a strong bond even to damp surfaces.
Tile-friendly
Provides a sound base for tile adhesives in bathrooms, pools and kitchens.
Suitable for water retention
Designed for tanks and pools that hold water constantly.
Negative-side option
Crystalline systems can be applied inside basements where the outside isn't accessible.
Low odour, water-based
Safe to apply indoors and in tanks, with no solvents or torches.
Economical
Cost-effective protection for large wet areas and tanks.
Applications across the UAE
| Sector | Typical application | Why it fits |
|---|---|---|
| Residential | Bathrooms, kitchens, balconies, villa pools | Tile-ready, reliable wet-area barrier |
| Hospitality | Pools, spas, kitchens | Handles constant water exposure |
| Commercial | Plant rooms, toilets, concrete water tanks | Durable under tiles and screeds |
| Infrastructure | Chambers, pits, water-retaining structures | Crystalline protection within concrete |
| Basements | Internal (negative-side) waterproofing | When external access is impossible |
Flexible cementitious vs crystalline
| Factor | Polymer-modified (flexible) | Crystalline |
|---|---|---|
| How it works | Forms a flexible surface film | Crystals grow within concrete pores |
| Crack movement | Bridges fine moving cracks | Seals static hairline cracks |
| Best for | Wet areas, pools, tanks under tiles | Basements, water-retaining concrete, negative side |
| Under tiles | Yes | Yes (per manufacturer) |
Quality control and safety
- Substrate preparation and pre-wetting checked
- Mixing ratios and pot life controlled per batch
- Thickness and coverage checked per coat
- Details (drains, corners, penetrations) inspected before second coat
- Curing protection in heat and wind
- Flood/fill test recorded before tiling
Why choose ESA for cementitious waterproofing
- Wet-area and tank specialists. Since 2006 across the UAE
- Potable-suitable options. Correct products for drinking-water tanks
- Detail-led. Drains and penetrations are where leaks start, so we reinforce them
- Tested before tiles. Leaks found before they're hidden
Cementitious Waterproofing: frequently asked questions
Can cementitious waterproofing be used in drinking water tanks?
Yes, if the product is approved for potable-water contact. We use suitable products and follow cure times before filling.
Is cementitious waterproofing flexible?
Polymer-modified two-component systems are flexible and bridge fine cracks. Crystalline and standard cementitious coatings are rigid, so they suit less movement-prone areas.
Can it stop a leaking basement from inside?
Crystalline and negative-side cementitious systems can waterproof from the inside, after active leaks are plugged. External membranes remain best for new construction.
How long before I can tile over it?
Usually after the coating has cured per the data sheet and the flood test is complete, often a few days. We'll confirm the timeline for your product.
Written by the ESA Technical Services teamLast updated: