INSULATION 39
WHERE CONSTRUCTION HAS STARTED, IT IS ANTICIPATED THAT REGULATIONS AT THAT TIME WILL APPLY. WHERE WORK HAS NOT YET COMMENCED, THE 2020 REGULATIONS WILL APPLY REGARDLESS OF WHEN THE PLANNING/BUILDING NOTICE WAS SUBMITTED
and implementation of the changes to ADL in the second half of 2020, how can housebuilders prepare? The first option is to do nothing and
react at the point of implementation, when software has been finalised and early ‘recipes to compliance’ are more fully formed. This doesn’t represent the most strategic policy however, and is likely to hinder land acquisition and planning in the interim. A second option would be to leap in headfirst, and default to the proposed
Appendix R reference values in SAP version 10.1 for the notional dwelling. Ahead of the final published version of SAP, this approach mitigates the risks of ‘wait and see,’ however it does potentially go well beyond the most cost-effective routes to compliance. It’s worth noting that the ‘notional dwelling’ in the current iteration of ADL uses an external wall U- value of 0.18 W/m2
K too, as does option
two within the consultation document. The third, most practical option, sits
between these approaches. That is for housebuilders and developers to speak to their suppliers and manufacturers to understand how existing solutions can deliver cost-effective compliance in line with the proposed changes. The efficacy of the building fabric
remains in the front line, and it is critical that the changes implemented assist in one of the consultation’s additional aims – namely reducing the performance gap. Systems that are and can be delivered by approved technicians, monitored and traced, therefore have an important role to play in achieving this goal. One thing that is clear is that the transi-
tional arrangements to ADL 2020 will be far shorter than previous documents, ensuring more occupiers benefit from the current energy efficiency standards sooner. Where construction has started, it is anticipated that regulations at that time will apply. Where work has not yet commenced, the 2020 regulations will apply regardless of when the planning/building notice was submitted. With different regulations likely to be applied on the same site, common construction details between ADL 2013 and 2020 offer the best route to smooth the transition and ensure quality. Ultimately, by building effective partner-
ships with their supply chain, developers and housebuilders can update and evolve existing specifications to meet the new standards without redesign, helping to minimise additional costs. This means the houses built will perform closer to design values, achieve cost-effective compliance, and place the industry on a sustainable path to the Future Homes Standard too.
James Hulbert is head of housing at Knauf Insulation
WWW.HBDONLINE.CO.UK
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