Scotland: Section 6 Changes
Over the coming weeks we’ll be examining the upcoming changes to SAP and SBEM in more detail, which will hopefully give you a bit of a head start when these tougher regulations kick in come October 1st.
This week we’re travelling north of the border, and looking at the changes which are going to be imposed on Scotland when the new Section 6 goes live – this will also be on October 1st in line with the new SAP methodology and the new Part L.
The biggest change to Section 6 is the Target Emission Rate which is being tightened. Overall, the emission rate is being lowered by 25%, but this percentage will vary depending on the type of dwelling being built (so some houses will need a 30% reduction compared to current figures, some will only need 20%, but the national average will be 25%). This is known as the ‘Aggregate Method’ for calculating the Target Emission Rate and is being used by the new SBEM method in England and Wales.
Air Leakage Testing is another big change – but this isn’t coming into play just yet. Air tests are now commonplace at new developments in England and Wales; they are currently voluntary in Scotland. From May 2011, air tests will become compulsory for small dwellings, followed by all dwellings in October 2011 – around 5% of new houses will need to be tested.
Limiting U-Values are being reduced – walls will need to achieve an average U-Value of 0.25, ground floors will need to be 0.2, roofs 0.18 and glazing / rooflights 1.8 – these figures are lower than what is required in England and Wales.
To make things slightly more confusing, U-Values are different if you are planning a conversions project to create a new dwelling – the most noticeable change is a maximum U-Value of 1.6 for all windows, rooflights and external doors. Extension projects will fall under a third band of U-Values!
Thermal bridges are going to affect Scottish SAP Calculations more than ever before, assessors will need to look more closely at areas of a building where insulation overlaps. The Accredited Construction Scheme from the Energy Savings Trust gives more information about what building practices are required in order to comply with this section.
The minimum efficiency of heating systems is being increased – boilers running on mains gas, oil and LPG must be A-Rated for all new developments – oil combi’s can be B-Rated.
When it comes to lighting, three quarters of all internal light bulbs must be low-energy, and 100% in communal areas, such as stairwells of flats.
As this list of highlights shows, the new Section 6 is going through some substantial changes in a bid to reduce carbon emissions in Scotland. To find out how Energist can help you with future developments, call our Customer Service team on 08458 386 387.
