E4MCPF3 Jamb Build Up External Masonry Cavity Wall Masonry Outer Leaf Dense Concrete Block Inner Leaf λ ≤1.33 W/mK Partial Fill Insulation Window Jamb Architect downloads e4mcpf3_cad_file.dwg288.13 KB Registered Detail certificates e4mcpf3_certificate_0.pdf453.38 KB rcd_worksheet_71.pdf301.44 KB