P5PCFF2 Roof, Insulation At Rafter Level
Build Up
Party Masonry Cavity Wall
Separating Wall and Roof
2 x 100mm Aircrete Block (0.19W/m²K) Party (Separating) Wall
100mm cavity fully filled with insulation (0.044W/mK) density up to 40kg/m3
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
p5pcff2_cad_file.dwg72.32 KB
Registered Detail certificates
p5pcff2_certificate.pdf680.77 KB
rcd_worksheet_175.pdf340.6 KB