Alumasc Roofing

Bluroof Monolithic Membrane 6125

Part of Hydrotech Monolithic Membrane 6125 roof waterproofing system

Manufacturer: Alumasc Roofing 

Materials: Hot Applied Polymer Modified Bitumen (Hot Melt) 

BluRoof Monolithic Membrane 6125 is a hot-applied, polymer-modified, rubberised bitumen-based membrane, including 30% recycled material content. The membrane is applied in two layers to provide a coating with a nominal thickness of 6 mm and is used in conjunction with a range of reinforcement membranes and protection sheets.

BBA logo

Number: 90/2431 PS3
Issue date: 24/10/2018

Approved for use on

Blue Roofs Zero Falls Buried Roofs 

BluRoof Monolithic Membrane 6125 is satisfactory for use as a waterproofing layer in blue roofs on zero falls, in combination with a storm water attenuation system(1), with the following specifications:

  • inverted roofs ballasted with paving slabs on supports with limited or pedestrian access
  • inverted green roofs with limited access
  • roof gardens

(1) The storm water attenuation system is outside the scope of the Certificate


Concrete Timber 

The system is suitable for use on in-situ concrete, precast concrete, concrete block and timber substrates. The substrates must comply with the relevant requirements of BS 6229 : 2018 and, where appropriate, NHBC Standards 2018, Chapter 7.1.


Design Life of the Roof 

The ballasted product will provide an effective barrier to the transmission of moisture for the service life of the roof in which it is incorporated.

The insulation board is rot resistant and, as long as the water flow-reducing layer remains undamaged, will have a life of at least 25 years under normal circumstances.

Under normal service conditions, the water flow-reducing layer will have a service life equivalent to that of the insulation in the inverted roof.

Care must be taken to ensure that the protection/ballast layer provides complete cover to the water flowreducing layer during the membrane service life to avoid UV degradation.

In situations where maintenance or repair of any of the components in the roof structure is necessary (eg the protection layer or insulation), the waterproof integrity of the membrane may be reduced. In these circumstances, the Certificate holder should be consulted.

An estimate cannot be given for the life of green roof and roof garden specifications owing to the nature of use. However, under normal circumstances, it should be significantly greater than for open coverings.

The membrane is resistant to the acidic and alkali conditions it is likely to encounter during its service life, as well as chemicals, such as liquid fertiliser, it may come into contact with.

Installation Requirements

The system should only be installed by contractors who have been trained and approved by the Certificate holder, from whom details can be obtained.

Fire Safety

The system, when used in protected specifications including an inorganic covering listed in the Annex of Commission Decision 2000/553/EC, can be considered to be unrestricted under the national Building Regulations.

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

Certified Products

The following products are also covered by the same certification:

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Alumasc Roofing

White House Works
Bold Road
St Helens

T : 01744 648 400

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