3221 Rammed earth construction - Formwork (0) Formwork for rammed earth construction 3222 Rammed earth construction - Reinforcement (0) Reinforcement of all types for rammed earth construction 3223 Rammed earth construction - Dpc's and underlays (0) Underlays and damp-proof courses to rammed earth construction 3224 Rammed earth construction (1) Earth, with or without cementitious construction or other admixtures, and reinforcement, placed and consolidated into formwork, including all accessories 3225 Rammed earth construction - Surface treatment (8) Surface treatment to rammed earth construction, either to produce a key for subsequent finishes or a finished surface