- RC loadbearing wall
- Balustrade omitted for clarity
- In-situ floor slab
- Rc column
- Precast concrete spine beam
- In-situ RC landing
- Housing for spine beam
- Floor finish
- In-situ Rc landing
- Cantilever concrete or timber tread with 25mm overlap of tread below .
- Foot of spine beam housed in pocket cast in floor
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