Fabric Energy Efficiency for Part L 2013
The consultation proposals for Part L 2013 standards relating to new homes include the recommendation that they should comply with a mandatory minimum fabric ‘performance’ standard (Target Energy Efficiency, TFEE) in addition to the mandatory carbon emissions
standard (Target CO2 Emission Rate, TER). This is a change from the current requirements, where the Approved Document includes a set of elemental backstops for the building fabric as guidance only.
The consultation proposes that the minimum fabric performance standard should be based on the methodology of the Fabric Energy Efficiency Standard as put forward by a Zero Carbon Hub Task Group in 2009 and subsequently adopted for Ene2 of the Code for Sustainable
Homes (CSH) in November 2010.
The consultation gives two possible levels at which to set the fabric standard, referred to as ‘Interim FEE’ and ‘Full FEES’. No preference is expressed as to which standard should be set. The specifics of these levels and the Fabric Energy Efficiency (FEE) methodology as a whole are discussed later in this document, as is the interaction between the possible fabric standards and the preferred CO2 emissions standard for 2013.
The FEE is a performance standard and hence the specification required to meet any particular level will vary depending on the design of a particular dwelling type. To aid consideration and responses by consultees to the Part L 2013 proposals, this report gives example specifications for four illustrative dwelling types in achieving the ‘Interim FEE’ and ‘Full FEES’ levels.