ALLCOAT Damp Proof Paint

Used to form all liquid or vapour membranes required for waterproofing purposes

Damp Proof Paint

Industrial Wall Coating

5litre – £31

ALLCOAT Damp Proof Paint is a styrene butadiene based single pack waterproofing system. The product is supplied ready to use straight from the tub or pail. The consistency is similar to that of thick emulsion paint, the standard product being supplied as a black or white membrane coating. The membrane is flexible and elastic, resistant to light abrasion and UV light.

ALLCOAT Damp Proof Paint is water based and safe to apply onto damp substrates by brush, roller or spray. Membranes are typically touch dry in one hour.

Typical Uses

  • Waterproofing membrane giving high flexibility and good bonding
  • Under self smoothing floors or thin section floor screeds where the original membrane has been punctured
  • Waterproofing system for basement floors below ground level
  • Waterproofing or tanking to walls either alone or as part of a multilayer system
  • For roofs, will act as the principal waterproofing system or as part of a repair system
  • Under tiled areas as a secondary protection for wet areas
  • Silage and sewage tanks
  • Protection against Carbon Dioxide and Methane penetration


All contact surfaces must be sound, clean, smooth with a trowelled or brushed finish. Any masonry should be flush pointed and defects in existing surfaces made good. Remove any laitence, dust, loose material or surface water.


No priming is necessary. To assist the membrane in fully wetting out the substrate the background may be dampened. There should not be any standing water.


Stir well before use. The membrane may be applied by brush, roller or airless spray. If necessary the liquid compond may be diluted with a little water (max 5% by vol.) to reduce the viscosity. Care should be taken to ensure that the correct dry coat application thickness is achieved and that the drying time is not unacceptably extended. A minimum dry film thickness of 0.6mm is required to provide a vapour barrier. Typical coverage value, depending in substrate, is 1.1 litres/m². This should be applied in a minimum of two coats, each of 0.55 litres/m², in order to comply with CO102: 1973, Code of Practice for the protection of buildings against water from the ground.

For the dry film thickness to be 0.6mm, the wet film thickness needs to be 1.1mm. This will be achieved at a coverage rate of 1.1 litres/m² applied in two coats each of 0.55 litres/m² (1.2kg/m² applied in two coats each of 0.6kg/m²). For the application of a dry film thickness of greater than 0.33mm in a single coat it is
recommended that the membrane is applied by airless spray. Using airless spray, a single application dry coat thickness up to 1mm may be achieved.

When applying two or more coats it is recommended that subsequent coats be a differenct colour and are applied at right angles to the previous coat. Before applying a second coat it is necessary to allow the first coat to become touch dry, typically one hour. The second coat should be applied within 24 hours of applying the first coat. If applying a subsequent screed to ALLCOAT Damp Proof Paint, a third coat may be used as a primer for the screed.


No special curing is required. Application of the membrane should not be undertaken if rain is expected before the coating can dry. Do not apply in temperatures below 5ºC.


10 litres, 25 litres, 5 litres


Black, White

Specific gravity

1.1 @ 25ºC


2800 – 4300mPas

Resistance to pressurised water Penetration

0.6mm thick dry film of the membrane will resist a water pressure of 0.2N/mm² (equivalent to 20 metres head of water)

Water vapour permeability

0.6mm thick dry film of the membrane conditioned at room temperature for 7 days prior to test gave a water vapour permeability <4g/m²/24 hours at 25ºC/75%RH (BS 3177)

Carbon Dioxide permeability

On the basis that the carbon dioxide permeability of a coating is ten times less than its water vapour permeability, 0.6mm thick dry film of the membrane will have a carbon dioxide resistance of 100 metres of still air (Recommendation for anti CO2, coatings at least 50m)

Methane permeability

0.6mm thick dry film of the membrane conditioned until a steady state is achieved prior to test gave a gas transmission rate of 79mL/m²/24 hours at 23ºC/1 bar (BS 903)

Accelerated ageing

Ageing in “Xenotest” equipment showed that an exposure equivalent to two years of Arizona sunlight did not embrittle the film

ALLCOAT Damp Proof Paint TDS   ALLCOAT Damp Proof Paint TDS

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