P5MCFF2 Separating wall and roof with insulation at rafter level
Build Up
Party Masonry Cavity Wall
Separating Wall and Roof
2 x Leaves Dense Blockwork Party (Separating) Wall
Cavity fully filled with insulation
150mm insulation (λ = 0.044W/mK) between the rafters
50mm (λ =0.022W/mK) below the rafters
This LABC Registered Construction Detail is only valid for use with building work intended to follow the guidance in the following:
England
- Approved Document L1A and L2A (2013 edition incorporating amendments up to and including 2016)
- Approved Document L1B (2010 edition incorporating amendments up to and including 2018)
- Approved Document L2B (2010 edition incorporating amendments up to and including 2016)
NOTE: This LABC Registered Construction Detail should not be used for Approved Document L Volume 1 and 2 (2021 edition) or any subsequent amendments.
Wales
- Approved Document L1A, L1B, L2A and L2B (2014 edition incorporating amendments up to and including 2016)
NOTE: This LABC Registered Construction Detail should not be used for Approved Document L Volume 1 and 2 (2022 edition) or any subsequent amendments.
Architect downloads
p5mcff2_cad_file.dwg226.81 KB
Registered Detail certificates
p5mcff2_certificate_0.pdf452.49 KB
rcd_worksheet_59.pdf301.44 KB