056 RCI 0717

RCI July 2017

INSULATION Spacetherm mitigates thermal bridging Gold’s the answer for St William’s College Icopal says that its Monarfloor Bridgestop acoustic isolation system is an ideal solution for housebuilders looking to take advantage of the £1.2bn Starter Homes Land Fund and develop brownfield sites. The system is said to offer superior acoustic performance for separating party cavity walls on raft foundations or continual slab, reducing costs by more than 18%. Monarfloor Bridgestop is reportedly the only acoustic isolation system for party walls available that can be used in conjunction with raft foundations or continual slab. It is said to isolate both masonry leafs from each other, reducing flanking transmission, and preventing an acoustic bridge by the collection of mortar at the base of the cavity. Whilst specified within Robust Details E-WM-19 & A2, Monarfloor Bridgestop can also be used within intermediate floors where there is a continual slab or to isolate steel or other building elements. Lee Nichols, product development & business manager at Icopal, commented: “With a drive for more houses to be built on brownfield sites, Monarfloor Bridgestop is proving to be an ideal solution. It offers the architect increased flexibility to design continual slabs at ground and intermediate party floor levels, resulting in significant cost savings of 18% from reduced materials, handling and waste.” The Monarfloor Bridgestop System kit comprises a roll of Bridgestop Membrane, two rolls of Bridgestop Quilt and 40 x Bridgestop Ties to cover 8 linear meters. When used with a gas or radon barrier, the system will ensure the integrity of the barrier by preventing possible damage from mortar droppings. www.monarfloor.co.uk 056 JULY 2017 RCIMAG.COM Zink Copper Stainless 01992 801927 www.almhm.co.uk Monarfloor Bridgestop ideal for uplift Keeping cosy with Kingspan Kooltherm Kingspan Kooltherm K5 External Wall Board has been specified as part of a large-scale whole building retrofit system installed on a social housing development in Solihull, dramatically reducing its energy requirements. Grandy’s Croft, a low-rise block, was upgraded to meet the demanding EnerPHit Standard using a wrap-around large scale (OWLS) retrofit solution: the Beattie Passive TCosy. Funded by Innovate UK through their ‘Scaling-up Retrofit Competition’, the pilot project was a collaboration between Solihull Community Housing, system designers and installers, Beattie Passive, Passivhaus consultants and project managers, Encraft. The all-in-one retrofit solution was installed around the existing building to create an insulated envelope, limiting thermal bridges. Kingspan Kooltherm K5 External Wall Board was selected as a key component of the system. Ron Beattie, managing director of Beattie Passive, explained: “Using the Kingspan Kooltherm K5 External Wall Board within our retrofit system has helped us to achieve U-values of just 0.099 W/m².K for the walls and an airtightness test result of 0.93 air changes per hour (ach) @ 50 Pa. These calculations mean that the Retrofit system easily meets Enerphit Standards.” It is anticipated that tenants’ energy bills will be reduced by 85%, from £1,064 per flat to just £166 per year. www.kingspaninsulation.co.uk The Problem: How to insulate a historic building with uneven rafters and existing ceilings below without raising the roof and without condensation risk. St William’s College is a jettied timber-framed Grade 1 listed building with magnificent medieval halls within. Dating from 1465, it was originally home to the Chantry priests. St William’s has had many owners and different uses since then – even housing the Royal Printing Press during the Civil War. However, with only 1F felt and no insulation, the energy costs were prohibitive. Re-roofing offered the chance to insulate but it was essential to preserve as much of the fabric and structure of the original building as possible. With lath and plaster ceilings, a vapour barrier could not be installed; the roof could not be raised and the rafters were extremely uneven. TLX Gold was used and draped over the rafters, acting as both breather membrane and insulation, with 20-50mm PIR board used between the rafters where they were sufficiently deep to accommodate it. There was no need to counter batten, and calculations indicated that there should be no condensation risk. Finished off with lead work by Mark Winters, the building should head into its next 700 years warm and dry. The Solution: BBA Approved TLX Gold, the 2-in-1 insulating breather membrane, provides a thermal upgrade in limited rafter depth without condensation risk. www.tlxinsulation.co.uk Spacetherm Wallboard has been supplied by A. Proctor Group to mitigate thermal bridging for the historic Electricity House building in Bristol, which was recently converted into luxury flats. Used in this instance as a Window Reveal Board, Spacetherm Wallboard was developed to prevent thermal bridging through a component or element of a structure. Spacetherm Wallboard is said to be a high performance laminate, which consists of Spacetherm Aerogel insulation blanket bonded to plasterboard, and is ideal for use in applications where low U-values are required, and space is at a premium. Planning requirements stipulated that the original window opening aperture sizes had to be maintained, and to alleviate thermal bridging on the existing window reveals, a thin insulation solution was crucial. Spacetherm is said to offer superior thermal performance, which enabled the contractor to insulate the existing window reveals with just 17.5mm overall thickness, whilst still providing a high performing thermal conductivity of only 0.015 W/mK. The company says that Spacetherm is engineered for unsurpassed thermal performance in space-critical applications and offers exceptional thermal conductivity, plus breathability allied to hydrophobic characteristics. Spacetherm Blanket is said to be an ideal choice for timber or steel frame structures and on request can be cut to a variety of widths and sizes to suit different applications. In addition, it can also be bonded to a wide range of boards and substrates. The company says its flexibility and ease of use, combined with exceptional thermal performance qualities, which can be retained for up to 50 years, make it a preferred choice for many architects and specifiers. www.proctorgroup.com Kingspan Kooltherm K5 External Wall Board has been used as the insulation layer on an off-site, wrap-around large scale retrofit solution


RCI July 2017
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