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Varnished wooden alternating-tread staircase standing in the workshop

Projects · Interior joinery

Alternating-tread staircase

A staircase with alternating treads to climb through a narrow opening.

Date
May 2026
Service
Interior joinery

The alternating treads of this staircase make it possible to climb through a narrow opening. The stringers were marked out and grooved in the workshop, the treads cut, then the whole staircase varnished and assembled before fitting.

Photos

In the making

  • A jig to machine the grooves of the stringers
  • A stringer marked out and grooved to hold the steps
  • Treads cut in the workshop
  • Two grooved stringers on trestles
  • Varnished treads drying
  • Varnished stringers ready for assembly
  • Varnished wooden alternating-tread staircase standing in the workshop

Finished

  • The staircase fitted in a narrow opening, seen from above

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