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3320 Concrete masonry (6)
3321 Hollow concrete blockwork (9)
Blockwork consisting of hollow concrete blocks laid in courses on a mortar bed to form structural and non-structural walls, including retaining walls, partitions, plinths, columns, etc.
3322 Concrete-filled hollow plastics blockwork (2)
Blockwork consisting of expanded polystyrene hollow plastics blocks, laid in courses with interlocking horizontal and butt vertical joints, with bar reinforcement and with interstices filled with concrete as required
3323 Solid concrete blockwork (2)
Blockwork constructed of solid concrete or aerated autoclaved concrete blocks, laid in courses to form structural walls
3324 Lightweight concrete blockwork (7)
Load bearing and non-load bearing light weight concrete blockwork, consisting of autoclaved aerated concrete, pumice or other light weight fillers, including laying and reinforcing.
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