Swisslab External Wall Insulation (EWI) from Alumasc has been used for the major refurbishment of Tarmac’s UK Headquarters in Wolverhampton.
The 1960’s building was constructed with a reinforced concrete skeletal frame and external infill cavity walls. Frost damage over the last 50 years had resulted in corrosion of the outer reinforcement steel, causing the existing roughcast render to crack.
Swisslab is a leading insulated render system for use on existing properties where the structure provides continuous support for insulation slabs. 2500m2 of Swisslab was installed on the Tarmac scheme, incorporating a high performance 1.5mm Silkolitt silicone render finish in cream along with Phenolic insulation boards.
50mm Phenolic boards were used on the main structure, narrowing to 20mm boards around the window reveals. The dated architectural style of the building made it difficult to bring it up to current thermal standards, however, with the use of Swisslab, the U-Values of the external walls has been reduced from 1.35w/m2K to 0.31W/m2K – an impressive reduction of 77%.
Peter Waring, Project Manager at Tarmac, was instrumental in the specification of the new external render works. He explains: “The design of the building involved the floor slabs finishing flush with the external layer of brickwork. This ruled out the possibility of using cavity wall insulation as it would have left the floor edges as cold bridging points, so we were looking for an EWI system that could be installed over the existing substrate. It was important that our chosen system provided a durable, weatherproof finish that would ultimately give the building a smooth, modern look, whilst also improving its thermal efficiency.”
Alumasc co-ordinated timed product deliveries to site in order that the building could remain functional, with its 500 residents in situ, while external works took place. Alumasc’s approved installer was Gaffney and Guinan Contractors of Coventry.
Swisslab is a BBA Approved and fully warranted system offering a life expectancy in excess of 30 years. It is weather resistant yet vapour permeable and can be faced with Alumasc’s range of M.R. Polymer modified renders for a traditional appearance, or Silicone or Mineral renders for a more contemporary look.
For literature, please call Alumasc on 0808 100 2008 or alternatively, visit www.alumascfacades.co.uk