Accredited Construction Details for Part L

Accredited Construction Details (ACD’s) have been developed to assist the construction industry achieve the performance standards required to demonstrate compliance with the energy efficiency requirements (Part L) of the Building Regulations.

The details and introductory section focus on the issues of insulation continuity (minimising cold bridging) and airtightness.  They are not intended to provide any detailed guidance on other performance aspects such as vapour control, ventilation, etc which must also be considered by the design and construction team.

The details contain checklists which should be used by the Designer, Constructor and Building Control Body to demonstrate compliance.

The details have been grouped by generic construction type.  It is strongly recommended that the introductory section is read in conjunction with the particular set of ACD’s in order to better understand the principles underpinning the details  themselves.

• Section 1 - Introduction and general theory of insulation continuity and air tightness (PDF 1.23 Mb)

• Section 2 - Indicative detail drawings: