Advice
The standard set out in Approved Document Part L 2021 is a maximum air permeability of 8 m3 /(h·m2 ) @ 50Pa. However, the air test target will vary between different dwellings & is often lower than the maximum set out above in Part L. This is determined by the dwellings SAP Calculations. A better
Advice
The short answer is no! However, under the updated 2021 Part L Building Regulations, gas boilers must be accompanied by some form of renewable energy to meet compliance. This is most commonly solar PV. The solar PV requirement will depend on the fabric and heating specification of the dwelling. When carrying out the SAP calculations
Advice
Myth #1 – A 150mm cavity is required This is dependent on the insulation you are using. A better performing insulation will require a smaller thickness to meet compliance. For example, 90mm of a high-performance PIR board with a 10mm air gap can achieve the same results as 150mm wool insulation. Myth #2 – I
Recent Projects
THE BRIEFUK Building Compliance carried out L1B SAP calculations on a Barn Conversion to a Holiday unit. THE RESULTs TER = 17.61kg/m2TPER = 183.13kWh/m2TFEE = 97.73kWh/m2DER = 0.65kg/m2DPER = 52.58kWh/m2DFEE = 72.59kWh/m2 Guidance was given on gaining higher EPC scores – through heating systems and the use of renewable technologies.
Recent Projects
THE BRIEFUK Building Compliance were asked to undertake an L1B SAP assessment in Aberarth, Wales. THE RESULTs TER = 19.89kg/m2TPER = 205.72kWh/m2DER = 17.33kg/m2DPER = 179.53kWh/m2 Completed the calculations while offering advice on renewable technologies and heating systems to improve the EPC score.
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