Drybase BBA Tanking Slurry


Drybase BBA Tanking Slurry is a cementitious, ready-mixed surface waterproofer. The waterproofing function is achieved by a unique composition of cement, graded quartz sand and selected additives. It can be used against active and passive water pressures.

  • Above and below ground waterproofing
  • Efflorescence-free
  • Can be spray applied
  • Tested for resistance up to a 6 m head of water
  • Resists water pressure on concrete and masonry surfaces
  • For use both above and below ground
  • CE-marked and BBA-approved
Drybase BBA Tanking Slurry 25KG - Toner Dampproofing Supplies Ltd
Drybase BBA Tanking Slurry 70.56

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Drybase BBA Tanking Slurry

Creating a watertight and waterproof floor is not easy, especially in new buildings and older structures where water is always present. Installation and renovation projects involving basements, car parks, swimming pools and other below-ground structures, may require a high-performance tanking slurry that can stand up to water pressure and the elements.

Drybase BBA Tanking Slurry is a cementitious, pre-bagged BBA-approved surface waterproofer that may be used on both horizontal and vertical surfaces. It is a long-lasting, heat and frost resistant material that is suitable for use in all seasons and conditions. The waterproof formulation has been tested to resist water pressure for up to 7 bar (approx. 70m head).

Waterproofing With Drybase

Drybase BBA Tanking Slurry is a versatile multi-surface waterproofer that may be used on a wide range of surfaces, including but not limited to water retaining structures like swimming pools or reservoirs, below ground structures like basements, car parks, retaining walls & lift pits as well as simple damp-proofing above ground, Drybase Tanking Slurry is an effective multi-surface waterproofer.

No matter the size of the job, Drybase BBA Tanking Slurry prevents water penetration. It’s a well known vapour permeable waterproof barrier that allows for the natural transfer of moisture vapour.

Drybase BBA Tanking Slurry dries efflorescence free, making it ideal for use as a substrate around steel to prevent rebar corrosion.

It is easily applied by brush, trowel or render spray machine for flexibility and ease on the job.

Use On Small Or Big Jobs

Drybase BBA Tanking Slurry specialised formulation has been used in large-scale civil engineering works and commercial contractor basement waterproofing projects all around the UK, Ireland, Europe, America, Canada, Australia and other parts of the world.

Strong Bond

Drybase BBA Tanking Slurry should be applied with a trowel or sprayer in two coats. It may be used on clean, flush-pointed brickwork, rendered walls, and open-pore concrete substrates. Once applied, Drybase Tanking Slurry forms a tough coating for stronger adhesion to Drybase Universal Mortar and other concrete or masonry substrates.

The Drybase Tanking Slurry’s exceptional bonding capability makes it a great choice for both vertical and horizontal surfaces. Drybase can be used to tank foundations, retaining walls, and slabs. Drybase Universal Mortar may be used to repair any damage prior to application, while water leaks may be filled with Drybase Waterproof Plug.

BBA-Certified & Approved

Drybase Tanking Slurry is a certified to British Board of Agrément and has been proven to resist water and sulphates, as well as long-term performance of the structure it is used on. Drybase Tanking Slurry will resist against groundwater and sulfate-rich soil, which can cause significant structural damage.

Waterproofing & Tanking Solution for:

  • Basement and cellar waterproofing and refurbishment
  • Underground car parks
  • Retaining walls
  • Lift pits
  • Tanks, reservoirs and water treatment works
  • Fish ponds and water features
  • Above-ground walls

Additional information

Weight 25 kg
Dimensions 57 × 37 × 17 cm



Does not apply

Part Number




Effective Treatment

Damp Proofing, Waterproofing

Size(s) & Packaging

25 kg PE-lined paper bag


BBA, EN 1504-3:2005/ZA.1a


Grey Powder


Dry conditions at 5 °C to 35 °C.

Shelf Life

12 months


approx. 2.0 kg/l

Working time

approx. 45 min

Setting time

Approx. 5 – 6 h

Compressive strength

approx. 40 MPa

Bending tensile strength

Approx. 6 MPa

Chloride ion content

≤ 0.05 %

Adhesive bond

≥ 2.0 MPa

Coverage Calculator


Application for Drybase BBA Tanking Slurry:

Preparation: Concrete Substrates

The substrate to be treated must be sound and even, open pored, roughened and its surface free from voids, large cracks or ridges. Any adhesion reducing substances like bitumen, oil, grease, remains of paint or laitance must be removed by suitable means, such as sandblasting, scabbling etc. Construction joints and shrinkage cracks exceeding

0.3 mm should be routed out to a minimum depth of 20 mm. Shutter tie holes should be roughened. Water leaks must be stopped using Drybase® Waterproof Plug. Thoroughly moisten the substrate. It must be damp but not wet at the time of application. Any surface water on horizontal surfaces must be removed.

Preparation: Brick and Block-work Substrates

Any remaining plaster, render or other substances that could inhibit bonding must be removed back to the substrate. Gypsum, remains of wood or other foreign material should be removed by appropriate means. Loose mortar must be routed out and the substrate cleaned thoroughly.

Unless the substrate is particularly sound the application of
a render is recommended prior to application of Drybase Tanking Slurry. Onto the pre-wetted walls (to control suction) apply nominal 10 mm thick 3:1 sand:cement render (sand to BS 1199, Table 1). The render should be compacted onto the wall and left with an open textured finish, such as that left by a wood float.

Make localised repairs using Drybase Universal Mortar.

Thoroughly moisten the substrate. It must be damp but not wet at the time of application. Any surface water on horizontal surfaces must be removed.


Mix 25 kg of Drybase Tanking Slurry with 4–6 litres of tap water in a clean container for at least 3 minutes to a lump-free, homogeneous consistency. Use a mechanical mixer.


Drybase Tanking Slurry is applied with brush, trowel or suitable spray equipment.

A maximum of 2 mm (approx. 4 kg/m2) can be applied in one working cycle. Normally two coats are recommended. Please refer to relevant coverage rate. It is recommended to apply the next coat whilst the previous coat is still damp on the surface. The previous coat is textured by suitable means, (such as a soft brush) whilst still plastic to form a key.

The previous coat must not be damaged during application of the following coat. The waiting time before applying the second coat is usually between 2 – 4 hours depending on climatic conditions such as humidity, temperature, etc. To maintain workability of the material do not add water, simply re-stir the mixture.

Do not apply at temperatures below +5 °C, or to a frozen substrate.

Brush application

Can be used to ‘prime’ the surface. Ensure that all cavities in the substrate are filled and appropriate cover is achieved. It should be applied to a level surface to avoid insufficient coverage.

Trowel application

First a scratch coat is applied for maximum adhesion to the substrate, working from the bottom up. Ensure all cavities in the substrate are filled, to exclude any trapped air.

Spray application

Drybase Tanking Slurry can be sprayed typically using a nozzle with a diameter of 6 mm. Apply first coat of Drybase Tanking Slurry in a circular motion with spray nozzle at a 90° angle to the substrate. The material is flattened and keyed.

The final layer can be left as a spray finish or for further advice refer to ‘Plastering/Coating’ section.


Keep damp for at least 5 days and provide protection against extreme weather conditions (e.g. sun, wind, frost). The freshly treated surfaces should be protected from rain for a minimum period of 24 hours.

Plastering and Coating

Surfaces treated with Drybase cementitious products to be coated or painted should be left to cure for 4 weeks. When
a plaster or render finish is required, it is essential to apply a rough cast of sand and cement on the Drybase cementitious coat while it is still ‘green’.

On hardened surfaces apply an appropriate bonding agent before rendering, such as Drybase SBR (not PVA) Coatings on top of a Drybase treatment have to be alkali resistant.

Decorative coatings and paints should be water vapour permeable.


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