Proteus Waterproofing

Cold Melt

Manufacturer: Proteus Waterproofing 

Materials: Polyurethane 

Cold Melt is a cold liquid-applied system consisting of:

  • Cold Melt Membrane — a two-part, liquid-applied polyurethane consisting of a resin component and a hardener
  • Cold Melt DPM — a two-part primer for use in preparing concrete substrates and polymer-modified sand/cement screeds with a moisture content greater than 75% relative humidity, prior to application of the carrier membrane
  • Pro-Prime SA — a single component primer for use in preparing timber and concrete substrates and polymermodified sand/cement screeds with a moisture content less than 75% relative humidity, prior to application of the carrier membrane
  • Pro-Carrier Membrane — a 0.6 mm thick, self-adhesive carrier membrane for use over primed substrates prior to application of Cold Melt Membrane
  • Pro-Grit 0.7 – 1.2 mm — kiln-dried quartz sand broadcast into wet Cold Melt DPM, to produce a mechanical key for sand/cement screeds and bedding mortars when used as an alkali protection layer.

BBA logo

Number: 16/5311
Issue date: 23/04/2019

Approved for use on

Green Roofs Inverted Roofs Protected Roofs Roof Gardens Zero Falls Buried Roofs 

For use as a protected waterproofing layer on zero fall roofsandflat roofs with limited or pedestrian access in the following specifications:

  • Inverted roofs
  • protected roofs, eg covered by pavers or other suitable protection, or
  • green roof and roof gardens



Precast concrete, concrete block timber decks and Proteus Pro-Therm Thermal Protection Board.


25 Years 

Cold Melt satisfies the requirements for a life of at least 25 years. In the opinion of the BBA, when fully protected and subjected to normal service conditions, the system will provide an effective barrier to the transmission of liquid water and water vapour for the design life of the roof in which it is incorporated.

In situations where maintenance or repair to the protection layer are necessary, the durability of the membrane may be reduced. In these circumstances, the Certificate holder should be consulted.

Installation Requirements

The system should only be installed by contractors who have been trained and approved by the Certificate holder.

Fire Safety

In the opinion of the BBA, a roof incorporating the system will be unrestricted under the national Building Regulations in the following circumstances:

  • a roof garden covered with a drainage layer of gravel 100 mm thick and a soil layer 300 mm thick
  • when protected by an inorganic covering (eg gravel or paving slabs) listed in the Annex of Commission Decision 2000/553/EC.

The designation of other specifications should be confirmed by: England and Wales — test or assessment in accordance with Approved Document B, Appendix A, clause A1 Scotland — test to conform to Mandatory Standard 2.8, clause 2.8.1(1)(2) (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). Northern Ireland — test or assessment by a UKAS-accredited laboratory, BRE or an independent consultant with appropriate experience.

In the opinion of the BBA, irrigated green roofs and roof gardens will also be unrestricted under the national Building Regulations.

If allowed to dry, plants used may allow the spread of flame across the roof. This must be taken into consideration when selecting suitable plants for the roof. Appropriate planting, irrigation and/or protection must be applied to ensure the overall fire-rating of the roof is not compromised.

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Proteus Waterproofing

21a Sirdar Road
Brook Road Industrial Estate

T : 01268 777871

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