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Sika Damp Proofing Slurry – Pallet Deals and Bulk Buy – Damp-Proofing and Waterproof Coating

Sika Pallet Deals and Bulk Buy

Sika Damp Proofing Slurry

Damp-proofing and Waterproof Coating

Sika Damp Proofing Slurry is a one part polymer modified cement based waterproof coating comprising of special cement based components and admixtures.  When mixed with water a slurry or mortar material is produced for direct application to a variety of construction substrates.

  • Low odour compared to bitumen coatings
  • Easy to use and apply
  • BBA approved
  • Brush, trowel or spray applied
  • Easy and fast mixing
  • Consistency can be varied to suit application method
  • Good adhesion
  • Excellent workability
  • Protects against water penetration
  • Conforms to BS 8102:2022 as a polymer-cement based waterproof coating for Type A shallow basement structures – Grades 1, 2 and 3


British Board of Agreement Certificate No. 00/3761 Conforms to the requirements of BS EN 1504-2:2004 Principles 1.3, 2.2 & 8.2, Annex ZA2 Table ZA.2

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£672.00£1,340.00 +VAT

£672.00 £708.00 +VAT
£1,008.00 £1,049.00 +VAT
£1,340.00 £1,393.00 +VAT

Sika Damp Proofing Slurry extended information

Sika Damp Proofing Slurry is used for:

  • Waterproof coating for tanking residential/domestic basements
  • Thin layer mortar or slurry coating/lining
  • For internal waterproofing/damp-proofing of basement and cellar walls and floors
  • For interior and exterior damp-proofing of basement walls in new buildings
  • For interior and exterior waterproofing of concrete, renders, brickwork and blockwork structures
  • Lining of water tanks, pools, planters etc


Sika Damp Proofing Slurry does not provide a traffickable finish. Protect with a levelling screed.
Sika Damp Proofing Slurry is not a decorative treatment and may display signs of “blooming” after rain or in damp weather conditions. This does not affect the performance of the coating.

Special attention is required to avoid puncturing the waterproof coating with fixings. These should be accommodated either by surface bonding with Sikadur Combiflex Adhesive, Sikadur 31 CF, Sikaflex 11FC or Sikaflex EBT.

Do not exceed maximum layer thickness.
Apply only to prepared, sound substrates.
Protect freshly applied material from freezing and rain.
Sika Damp Proofing Slurry will not bond to surfaces that have been treated previously with a water repellent.
It does not comply with DWI approvals.

Finishing plasters may take longer to set when applied over Sika® Damp Proofing Slurry.

Sika Damp Proofing Slurry Product Information

Chemical BasePortland cement selected aggregate and polymers
Packaging25 kg bags
Shelf Life6 months from date of production
Storage ConditionsMust be stored properly in undamaged and unopened original sealed packaging in dry and cool conditions.
Appearance / ColourCement grey
DensityFresh mortar density: ~ 2.1 kg/l (1.8 kg/litre powder)
Compressive Strength3 days~ 20 N/mm2(According to EN 196-1)
28 days~ 40 N/mm2(According to EN 196-1)
Modulus of Elasticity in Compression3 days~ 5 N/mm2(According to EN 196-1)
28 days~ 9 N/mm2(According to EN 196-1)
Tensile adhesion strength>1.5 N/mm2 (failure in substrate)
Permeability to Water Vapour3 MNsg-1

Sika Damp Proofing Slurry Application Information

ConsumptionDependent on the substrate roughness, surface profile and thickness of the layer applied.

As a guide, ~ 2.1 kg/m2/mm (excluding allowances for loss wastage, surface profile and porosity, etc.).

1 unit of 25 kg yields will cover approximately 6.5-7.0m2 @2.0mm thick- ness.
Layer Thickness1.0 mm min.
2.0 mm max.

For damp-proofing use minimum 2.0 mm thickness

For waterproofing use minimum 4.0mm thickness
Ambient Air Temperature+5°C min. / +35°C max.
Substrate Temperature+5°C min. / +35°C max.
Pot Life~ 30 minutes at +20°C
Waiting Time / OvercoatingApply 2nd coat within 24 hours of first coat.



The substrate must be structurally sound and free of all traces of contaminants, loose and friable particles, cement laitance, oils and grease etc.
The concrete “pull off” (tensile adhesive) strength must be > 1.0 N/mm2.

Substrate Preparation

Brickwork, masonry, blockwork:

The surface must be wire brushed, all mortar joints flush pointed, and the surface cleaned thoroughly to remove oils, grease, paint, bitumen or other surface contaminants. Note: glazed or smooth faced surfaces should be bush hammered or needle gunned. Soft/defective mortar joints should be raked out to a depth of 12mm and repointed using the Sika® Damp- proofing Slurry mortar mix.

Clean concrete surfaces by bush hammered, gtrit blasted or high-pressure water-jetting (400 bar) in order to remove all previous coatings, any traces of grease, rust, release agents, cement laitance and any other material which could reduce adhesion.
Water infiltration through the surface to be treated must be either diverted by drainage or concentrated at points which will be plugged. Sika Limited be consulted for advice on suitable materials.
Prefill all cavities, honeycombed concrete, etc, to provide an even surface, free from voids with Sika Damp-proofing Slurry mixed as a mortar (reduce water in mix to desired consistency).


Slurry application (brush): 4.5 – 4.7 L water per 25 kg bag
Mortar application (trowel): 4.0 – 4.25 L water per 25 kg bag

Spray application: 4.0 – 4.5 L water per 25 kg bag Mixing Time: ~ 3 minutes

Mixing Tools

Sika Damp Proofing Slurry Should be mechanically mixed using a forced action mixer or in a clean bucket using a drill and plaster paddle stirrer (max 500 rpm). A normal concrete mixer is NOT suitable.

Pour the required mix ratio of water into a mixing bucket and add Sika Damp Proofing Slurry slowly under continual mixing until a uniform lump free consistency is achieved (approx 3 minutes).


The substrate should be dampened thoroughly with no standing water before application.

Slurry Application:

Apply Sika® Damp Proofing Slurry in even layers using a flat fibre brush on vertical surfaces and a rubber squeegee or brush for horizontal surfaces and allow to stiffen (2-6 hours). Apply a second coat of Sika® Damp Proofing Slurry as soon as the first coat has hardened and within 24 hours at the same coverage rate.

Mortar Application:

Apply the first layer of Sika® Damp Proofing Slurry using a tooth trowel. Once the first coat has hardened, use a smooth edged trowel to apply the second coat.

Spray Application:

Use wet spray equipment to apply the first and second coats of Sika Damp Proofing Slurry ensuring the first coat has hardened sufficiently to prevent damage from the second spray application. Smooth second coat using brush or trowel.

For all applications apply second coat at 90o to the first coat.

Internal finishes:

Plasterboard for drylining can be bonded using plaster dabs, Sikaflex® 11FC or Sikaflex EBT. Timber battens can also be bonded with Sikaflex® 11FC or Sikaflex EBT. Finish plasters can be used. Do not pre-wet surface before applying plaster finishes. Do not use gypsum based plasters. Refer to plaster manufacturer for advice for use in damp-proofing works.


In damp internal conditions Sika Damp Proofing Slurry does not need curing. Ensure windows are closed to prevent drying winds. In external conditions when exposed to the sun and/or drying winds protect from drying out. Use polythene sheeting or other approved method.


Clean all tools and application equipment with clean water immediately after use. Hardened / cured material can only be removed mechanically.


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