A £14.4m three-storey PFI Extra Care complex at Knowsley, Merseyside, is benefiting from a speedier build time using off-site manufacturing that integrates Isokorb structural thermal break units from Schöck with the Hollowcore system. Bluebell Park Extra Care Facility homes are being built for Knowsley Housing Trust, part of the First Ark Group and is their largest Extra Care development to date. There are two blocks. The first provides 101 single and two-bedroom Extra Care apartments for rental; and the second, 21 two-bedroom apartments available for purchase through an Older Persons Shared Ownership scheme.
Many of the apartments feature spacious balconies, so combatting thermal bridging is critical. Quite apart from heat loss, condensation can cause structural problems and worse, lead to mould growth, with possible implications for residents in the form of respiratory problems and dermatitis. One of the most effective countermeasures on the market is the Schöck Isokorb structural thermal break; and the type KS14, for concrete-to-steel connectivity is installed at Bluebell Park to meet the steel cantilever requirements. This is in conjunction with the Hollowcore floor system. The precasters broke out selected cores and cast reinforcement bars in their works and then fixed the KS14 units to a template which matched the broken out Hollowcore. The complete modules then supplied to site, dropped into position and the broken out Hollowcore filled with insitu concrete.
The Hollowcore has full length voids, so there is a huge weight saving over floor slabs of equivalent thickness and strength, resulting in transportation and material cost efficiencies. With the slab sizes on the project being typically 1200mm wide x 4m long, they are faster to install and provide an immediate working platform for following trades.
In addition to the Hollowcore benefits, the Isokorb type KS14 offers its own verifiable performance values as well. It provides BBA Certification, LABC Registration – and comfortably exceeds the requirements of BRE IP1/06 and Part L of the Building Regulations. Here the temperature factor used to indicate condensation risk (fRSI), must be greater than, or equal to, 0.75 for residential buildings, which is comfortably exceeded by incorporating the Schöck product into the design.
A comprehensive 236 page ‘Technical Guide’ is available, which displays in detail the complete range of thermal break applications for all construction types – concrete-to-concrete, concrete-to-steel, steel-to-steel and concrete-to-timber.
A new ‘Thermal Bridging Guide’ is also available free on request
Contact Schöck on 01865 290 890 or email: firstname.lastname@example.org