BluRoof Stormwater Management

Blue Roof with Green Roof


Alumasc BluRoof systems comprise a single source, fully warranted waterproofing and sustainable drainage solution designed to alleviate flood risk, or where ground-based attenuation systems are limited, by attenuating stormwater via controlled discharge over a 24-hour period at roof level. The key components include a geotextile filter fabric, geocellular void former, flow control outlets and overflow to ensure that the roof’s integrity is preserved. Our systems are designed to meet the individual requirements of every project for use across all building sectors for new-build roofing.

Key Features & Applications

Alumasc’s BBA approved BluRoof stormwater management system provides managed roof attenuation options for a range of roof build-ups:

Warm Roof Solutions 

  • The dual-reinforced BluRoof built-up high performance membrane is specified as a fully bonded system, with extended and high-pressure rolled laps for excellent watertight integrity.
  • The waterproofing layer has a mineral free surface which reduces the risk of blockages.

Inverted Roof Solutions 

  • For inverted roof applications, including green roofs and podia, Alumasc’s BluRoof monolithic membrane forms the waterproofing layer upon which Alumasc insulation, BluRoof separation layer, BluRoof VF50 void former and surface finish are applied.

Non-Insulated Solutions

  • For buried (non-insulated) systems such as podium applications, Alumasc’s BluRoof monolithic membrane provides a self-healing waterproofing solution that is free from laps.
  • The BluRoof VF50 void former and surfacing are then applied, as with the inverted roof solution.

Green Roof Solutions

  • A root-resistant version of the BluRoof bituminous membrane is available for compatibility with Alumasc’s Blackdown green roof systems.

Harmer BluRoof Drainage Outlet

  • Harmer BluRoof Outlets restrict the maximum permissible discharge of stormwater by the inclusion of a restriction device that is removable for maintenance and adaptable to future climate change.

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White House Works, Bold Road, Sutton, St Helens, Merseyside, WA9 4JG