Formwork for in-situ RC stairs
- Formwork will vary for the different types of RC stair but the basic principles for each format will remain constant .
- Stair profile is built off an adequately supported soffit of sheet material by using a cut string .
- Riser boards should have a splayed bottom edge :
- To enable complete trowelling of the tread surfaces
- To ensure that air is not trapped under the bottom edge of the riser board , thus causing voids .
- 2 can considered to provide the abutment support for the riser boards :
- A reverse-cut string
- A wall board with hangers
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