The Schöck Isokorb – An effective alternative to wrapped parapets

Located near Highgate in North London, the Chester Balmore project consists of three elegant brick-clad blocks, housing 53 super-insulated one, two and three-bedroom flats.   The development is designed to achieve Code for Sustainable Homes Level 4 and the virtually airtight envelope is constructed using reinforced concrete and blockwork. Including an EPS filled 250mm cavity, the walls are half a metre thick and the windows triple glazed.

Preventing thermal bridging along the parapets is critical for such a high performance development, because parapets, as with balconies, can allow conductive materials to transfer energy through the thermal barrier.  Conventionally, in the majority of cases, the method of insulating parapets and parapet walls is to wrap the perimeter of the wall with an insulation barrier.  However, the Schöck Isokorb type A offers a cost-effective and more thermally efficient alternative.  Its 60mm insulation thickness results in low psi-values and therefore significantly reduces heat loss – and there is no wrapping required.  It permits a more sophisticated construction opportunity for greater freedom of design and allows flexible distance between elements according to load requirements.  An added benefit being there is no risk of any additional thermal bridging through balustrade fixings.   Other key factors are durability and water impermeability.   The Isokorb type A solution does not require maintenance and there is no risk of expensive restoration due to waterproofing problems.  Whereas wrapped components can be likened to an insulated flat roof, with many of the associated problems.   They are prone to damage and almost inevitable repair and maintenance outlay, particularly where railings or covers pierce the insulating layer.   With thermally separated parapets, railings and covers can be attached directly into the concrete.   The Isokorb type A provides BBA Certification and LABC Registration and meets full compliance with the relevant UK building regulations.  In addition, there is also compliance with the Government Standard Assessment Procedure, SAP 2012, concerning CO2 emissions from buildings and respectively heat losses through non-repeating thermal bridges.

For your free copy of the comprehensive 236 page ‘Technical Guide’ and / or a copy of the new Schöck ‘Thermal Bridging Guide’ contact the company on:

01865 290 890; email: design(Replace this parenthesis with the @ sign)schoeck.co.uk or visit the company website.