carbon reduction requirements as a planning condition.

SAP 2012’s representation of energy use in domestic properties is based on different standard heating patterns for weekdays and weekends, but further studies demonstrate that this distinction does not necessarily bear out in real life. The probability of any difference is even less likely now that working from home has become much more widespread. In contrast, SAP 10 applies the same standard heating pattern for every day of the week. It will also introduce a more precise estimate of hot water demand, accounting for the number of showers and baths as well as shower types and flow rates (for example, electricity use from instantaneous electric showers will

now form part of assessments). SAP 2012’s extremely basic lighting assessment only accounts for the number of low energy fittings. SAP10 will involve more detail in line with the non-domestic methodology known as SBEM and will recognise the use of new lighting types which provide higher efficiency. It will account for the contribution of natural light, bringing window design into the assessment mix. A ‘reference lighting capacity’ calculation will be based on floor area and solar gains. If the lighting design falls outside of this reference lighting range (either above or below), the predicted lighting energy will be increased to account for ‘poor’ lighting or ‘surplus’ lighting.

SAP 10 will remove SAP 2012’s indicative options of low, medium and high to assess Thermal Mass Parameter (TMP) and instead will include a detailed calculation of a building’s actual TMP based on build material, construction, and kappa values which are referenced in BS EN ISO 13786. SAP 10 will also reduce the assumed amount of ventilation gained from open windows, with factors such as outside noise and security taken into consideration.

In SAP 10’s thermal bridging provisions, the Accredited Construction Details

VEKA is leading the way in the future of recycled PVCu


his month, VEKA plc has unveiled plans to grow usage of recycled material beyond its existing Infinity system. VEKA has been the industry leader in

recycling and sustainability throughout its history with the first VEKA recycling plant opening in Germany in 1993. In 2007, VEKA Recycling opened its doors, the UK’s first windows recycling plant. Last year, the company’s ongoing commitment to sustainability has seen VEKA Recycling invest £150k in six new silos to increase the storage capacity at its state-of-the-art Wellingborough recycling plant, the most advanced of its kind in Europe. VEKA plc led the way in recycling PVCu launching its Infinity profile in 2010 - a dedicated system with an environmental conscience that contains up to 80 per cent recycled material. The coming months will see VEKA start to

roll out recycled material across a number of its mainline profiles starting with cills and following with frame extensions with potential to expand further throughout the course of the year. VEKA has committed to a strong focus in driving further usage of recycled


PVCu in the coming years. Recycling has become a crucial part of

VEKA’s strategy and over the last five years more than 24,000 tonnes of PVCu has been diverted from landfill. Dawn Stockell, Marketing Director of VEKA

plc commented: “Recycling and sustainability are a core focus

as part of our overall CSR commitment and a key objective for both VEKA plc and the broader group. Our investment into future proofing our products has seen us increase our co-extrusion capability, replacing aging tools with co-extrusion tools allowing for greater use of recycled PVCu . Committed to driving increased usage of recycled compound, our partnership with growing sister company, VEKA Recycling, will ensure that together we continue to make best-in-class PVCu window systems that care about the environment and can continue to be recycled for years to come.” Simon Scholes, Managing Director of VEKA

Recycling added: “We’ve invested £15 million into the plant at

Wellingborough – ensuring we can continue to lead the way in recycled PVCu. Our products are as close to virgin polymer as is possible. To get

recycled PVCu of this quality takes some work and ultimately does not result in a more cost- effective material – in fact using recycled PVCu is cost neutral but carries an important ethical message. In the past, recycled products have often been seen as second best, however with today’s PVCu, along with our technology and skills, we can ensure that the recycled product is a better product – one that is suited to being reused time and time again. We can now put in a frame that will last another 40 years with just one window or door frame offering up to 350 years of usage. In fact, the recycled products that are going in now will only need to be recycled by my successor’s successor. Now that is a sustainable legacy to be proud of.”

01282 716611

(ACD) scheme used under SAP 2012 is no longer considered to be sufficiently accurate. Assessment will be based on other established sets of construction details, prompting a re-think of many design practices and encouraging more junction details to enable accurate calculation of psi values. Where no details of thermal bridging are provided, the default y-value used in assessments has been raised from 0.15 w/m2 w/m2

k to 0.2

k, entailing a stiffer penalty for developers who fail to consider heat loss through building junctions.


SAP 10 is a welcome update to the methodology, more accurately representing how buildings perform. Its role in encouraging more precision and detail in energy assessments will prove to be a very positive influence across residential construction.

As we tentatively approach a return to normality, SAP 10 is likely to return to the forefront of the industry’s thoughts. The need to understand and embrace its principles is now a much more pressing matter.

Harry Hinchliffe is energy consultant and BREEAM assessor at C80 Solutions

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