68 INSULATION CIBSE guidance provides a simplified
equation for calculating ‘sol-air’ pressure but this does not account for wind, which can significantly affect the level of moisture entering the building through the brick work – driving rain and splash back as opposed to rain alone – so, ideally, dynamic hypothermal modelling is the best way of assessing risk. It is also beneficial to understand the climate context of the location, combining knowledge of wind, rain and temperatures with average peak sol-air temperatures and clear sky month climate data.
HYGROSCOPIC Woodfibre insulation has naturally hygroscopic properties, reducing the potential for humidity within the building fabric
While context and modelling will enable a thorough assessment of project-specific risk, specifiers should begin from a standpoint of viewing reverse condensation as a possibility for any unvented brick or masonry wall build up, and consider it a certainty for projects in the south east and other areas with high levels of driving rain. There are several things that can be done to mitigate that risk, including reducing air temperature absorption with lighter colours on external wall surfaces and protecting the facade from rain and splash back. It’s also important, however, to consider the properties of the specified insulation and whether, when considered holistically as part
Living with quiet
One of the most unusual locations for Troldtekt acoustic ceiling tiles has to be found inside a fascinating new house in Sai Kung, Hong Kong. This remarkable and exciting project by Millimeter Interior Design has transformed an impractical and cramped split level into a four-storey home incorporating a large living room, family room, four bedrooms, den, open roof top sitting area and a unique approach to garaging! The design is minimalist to the extreme with a simple but beautiful and ambient simplicity. The full ground floor stretches from the entrance out to the backyard deck. A cleverly designed sunken kitchen creates a clutter-free experience while perfectly fitting out all the essentials. The dining table is hidden at the floor level and can be elevated when required to further enhance space usage. With so many hard surfaces, reverberated sound is controlled by the use of Troldtekt acoustic ceiling panels throughout the main living space and interior garage. The benefits of 100 per cent Troldtekt natural wood wool panels include high sound absorption, high durability, natural breathability, low cost life cycle performance and sustainability.
www.troldtekt.co.uk 10 years of sustainability compliance
EAL Consult is proud to announce its new collaboration with Mclaren Construction, London’s design team working on projects by providing thermal bridging calculations, forensic SAP calculations and delivering training on
building sustainability. This year the team of award winning energy and sustainability specialists celebrate 10 years of delivering Part L Pre and Post Construction Sustainability Compliance Reports, BREEAM, SAP, SBEM, BRUKL, Thermal Bridging Calculations, Y and U-Value Calculations, Daylight/Sunlight/Overshadowing Reports, Training and Consultancy.
www.ealconsult.com Research links insulation to natural light
A new whitepaper from Kingspan Insulation has revealed that insulation specification can have a significant impact of daylight levels within a building. The enhanced thermal performance of Kingspan Kooltherm K15 Rainscreen Board allowed each U-value to be achieved with reduced external wall and reveal depths. The research showed this had a
significant impact on daylight levels. Kingspan Kooltherm K15 Rainscreen Board can therefore provide a thin solution which allows buildings to meet or exceed the minimum daylighting requirements in BS 8206-2: 2008 more efficiently than mineral fibre insulation.
01544 387 384
www.kingspaninsulation.co.uk
Effective insulation helps to improve building comfort and reduce bills
of the wall build-up, the insulation could actually aid controlled moisture transfer. For example, woodfibre insulation has naturally hygroscopic properties, reducing the potential for humidity within the building fabric. Where these properties are maximised in a woodfibre insulation that actively exploits capillary conductivity, the risk of reverse condensation and associated damage can be significantly reduced.
Balancing risk
As with any area of specification, neither the VCL nor the insulation specified should be considered in isolation but as part of a full wall build up. Similarly, higher standards of thermal performance must be balanced against the impact of increased indoor/ outdoor temperature ranges on the building physics with steps taken to design mitigation into the specification.
Andy Mitchell is sales director at NBT
WWW.ARCHITECTSDATAFILE.CO.UK
ADF JULY 2018
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