Drybase Universal Mortar


Drybase Universal Mortar is a cementitious, ready-mixed waterproofing and repair mortar. Drybase Universal Mortar is applied in layers of 6 to 12 mm thickness in one working cycle. This material is substantially resistant to abrasion and de-icing salt. Due to its composition, based on cement, graded quartz sand, and selected additives, Drybase Universal Mortar is waterproof. It is durable and resistant to frost after setting, and at the same time vapour permeable. Drybase Universal Mortar is tested for use in contact with drinking water.

  • Resistant to frost & de-icing salts
  • Repair & reprofile concrete, masonry & stone
  • For use against positive or negative water pressure
  • Suitable for contact with drinking water
  • Non-slump & high build
  • Suitable for horizontal and vertical surfaces

Available on back-order

Drybase Universal Mortar 25KG - Toner Dampproofing Supplies Ltd
Drybase Universal Mortar 81,24

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Drybase Universal Mortar

When repairing and waterproofing damaged concrete, masonry, or stonework, the mortar’s resistance is important. The stress applied to mortar by subsurface elements such as basements, swimming pools, and lift pits are even more intense.

Repair mortars are employed in some of the most demanding environments and weakest points of a building. You’ll need a mortar that can endure such an extreme condition.

Drybase Universal Mortar is a pre-blended cementitious waterproofing & repair mortar to maintain and renew the integrity of indoor and outdoor structures.

Repair & Waterproof Existing Structures

Drybase Universal Mortar’s cement and graded quartz sand-based composition makes it highly resistant to abrasion and frost, as well as waterproof.

It’s ideal for protecting key locations such as floor-to-wall junction fillet seals, concrete repairs, and shutter tie hole repairs. Reprofiling can be achieved through a layered application until the surface is smooth.

Single Coat Breathable Damp Proofing

Drybase Universal Mortar can be used as a single-coat tanking slurry and damp-proofing barrier. Drybase Universal Mortar will prevent wind-driven rain and outside water from causing penetrating damp.

The vapour permeability of a material is crucial for proper vapor passage, especially in damp and humid areas. The Drybase Universal Mortar is both vapour permeable and fully waterproof. In extreme environments like basements and tunnels, keep the humidity levels pleasant.

Additional information

Weight 25,4 kg
Dimensions 10 × 33 × 40 cm




Part Number




Effective Treatment


Size(s) & Packaging

25 kg PE-lined paper bag


EN 1504-3:2005/ZA.1a


Grey Powder


Store in a dry place

Shelf Life

12 months in unopened pack

Aggregate size dmax

2 mm


Approx. 2.1 kg/l

Compressive strength

approx. 40 MPa

Bending tensile strength

Approx. 6 MPa

Capillary absorption

0.08 kg/m2·h 0.5

Chloride ion content

≤ 0.05 %

Adhesive bond

≥ 2.0 MPa

Coverage Calculator


Application For Drybase Universal Mortar


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 with 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.

Brick and Blockwork 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 pointing must be routed out and the substrate cleaned thoroughly.

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.


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


Drybase Universal Mortar is applied with trowel or suitable spray equipment. Apply a minimum of 6 mm (approx. 12 kg/m2) and a maximum of 12 mm (approx. 24 kg/m2) in one working cycle. For small areas such as coves, fillets, local repairs and shutter tie holes Drybase® Universal Mortar may be applied in layer thicknesses exceeding the above value.

Pour Drybase Universal Mortar over horizontal surface, then compact and strike off. After initial hardening it can be trowelled or given a ‘brushed’ finish to provide a non-skid quality.

Apply Drybase Universal Mortar to vertical surfaces like normal render. If several coats are required it is recommended to apply the next coat whilst the previous coat is still damp at the surface.

The waiting time before applying the following coat depends on local climatic conditions such as humidity, temperature, etc. The previous coat must be textured by suitable means (such as a soft brush) whilst still plastic to form a key.

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.

Trowel Application

Apply a scratch coat first for maximum adhesion to the substrate. Ensure that all cavities in the substrate are filled in order to exclude any trapped air.

Spray Application

Drybase Universal Mortar can be applied with a suitable mortar spraying device. For maximum spray pattern it should be possible to adjust volume of product as well as air pressure and volume.

The nozzle diameter is approx. 10 mm. The first layer of Drybase Universal Mortar is applied in a circular motion with the spray nozzle held at a 90° angle to the substrate. The material is then flattened and trowelled or keyed for a further layer.


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


Surfaces treated with Drybase products which are to be coated or painted should be left to cure for 4 weeks. When a plaster or render finish is required on top of a Drybase treatment it is essential to apply a rough cast of sand and cement on the final Drybase coat while it is still tacky. On hardened Drybase surfaces apply an appropriate bonding agent, such as SBR before rendering. Coatings on top of a Drybase treatment have to be alkali resistant. Decorative coatings applied on the negative water pressure side should be water vapour permeable.

Datasheet & Downloads

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