LATEST ADVICE ISSUED TO HOMEOWNERS REGARDING PART L
Part L1 Conservation of fuel and power.
These regulations cover the energy efficiency of your new conservatory, if you are going to extend the new conservatory into your home without the benefit of external quality doors you will generally need to have a CO2 calculation carried out. This is in two parts, the first is concerned with a “Notional Extension” or conservatory which is an extension that has 25% of the floor area as glazing. This will produce a Notional CO2 figure expressed in kg/year.
The second part is the Proposed Extension, which has the required amount of glazing which can be significantly higher up to and including 80% glazing.
To compensate for the higher heat loss through the glazed walls and roof it will be necessary to improve the efficiency of the home and conservatory.
This can be done in a number of ways such as using high performance glazing, increasing the efficiency of the conservatory over and above that required by the building regulations.
Improving the efficiency of the existing home by:.
• Increasing loft insulation, wall insulation, floor insulation, improving the boiler efficiency and improving the efficiency of the doors and windows
• Siting of the conservatory can be beneficial, utilising a south facing elevation solar gain can be useful in improving the overall efficiency particularly with the use of solar control glazing.
Source: Clearview, January 2014, issue 146, p51