DIFF Subgroup
E04C 2/44 Full Title
Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels (materials or manufacture, see the relevant subclasses, e.g. B27N, D21J; made in situ E04B; specially designed for insulation or other protection E04B1/62; load-carrying floor structures E04B5/02, E04B5/16; roofs consisting of self-supporting slabs E04B7/20; roof or like covering elements E04D3/00; for lining or finishing E04F13/00)
CPC subdivides this area 4x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.