Largest Passive House Project in Europe set to utilise Alumasc Flat Roof System

Due to the EuroPHit project, a series of buildings from across Europe are to be retrofitted to Passive House Standards, this will include a mixture of residential and non-residential buildings using Passive House Components.

This EU project is to take place over the next 10 years and will lead to extensive improvements to the buildings such as economic efficiency, climate protection and repairs of any existing structural damage. In a large number of EnerPHit projects there has been up to a 90% reduction of heating energy demand.

Image Source: ECD Architects

Wilmcote House, Portsmouth consists of three 11 storey blocks that provides over 100 homes located in the central Portsea Island area of Portsmouth and owned by Portsmouth City Council. Built in 1968, this retrofit project would need to utilise the highest quality materials available to meet the Government’s economic targets and achieve the required 90% reduction in energy costs. The lifespan of the building, once refurbished, will also increase by another 50 years. Alumasc Roofing Systems has been selected to provide the refurbishment solution for over 1500m² of existing flat roof. The design brief is for the flat roof areas to be overclad using exterior grade plywood mounted on a lightweight steel framework, upon which the waterproofing system is to be installed. To achieve the goals of Portsmouth City Council from both a lifespan and environmental perspective, Alumasc have combined the qualities of the Derbigum and Hydrotech waterproofing systems to great effect. Hydrotech, a self-healing monolithic membrane with an unsurpassed track record of zero product failures in 50 years, will be installed to the newly laid plywood deck, and finished with the Derbigum Olivine, a CO₂ neutralising, high performance flat roof membrane.

Image Source: ECD Architects

The natural olivine (magnesium iron silicate) granules cause a chemical reaction in CO₂ in rainwater which converts it to harmless silicon dioxide (SiO₂, i.e. sand), magnesium carbonate (MgCO₃, i.e inorganic salt) and water. One square metre of Derbigum Olivine will neutralise approx. 1.75kg of CO₂, making it the optimum flat roof waterproofing choice for green specifiers. The roofing aspect of the project is to be conducted over 3 stages, one block at a time; stage one is due to commence in May 2015, second stage November 2015 and the final, third stage to be carried out in February 2016. The highly efficient and eco-friendly benefits of Derbigum Olivine combined with the guaranteed lifetime performance of Hydrotech made this the winning combination for the Wilmcote House project. This combined system offer also came with a market leading, comprehensive warranty package. The roofing aspect of the project is to be conducted over 3 stages, one block at a time, stage one is due to commence in May 2015, second stage November 2015 and the final, third stage to be carried out in February 2016. Other areas of the refurbishment also include new External Wall Insulation, various heating systems and highly efficient window systems.

For further information or if you would like to discuss Alumasc Roofing Systems for your projects call Greg Bourne on 07720 883 632 or email: bourneg@alumasc-exteriors.co.uk

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