Purposeful Consolidation: Stair Case Study Houses (III)
Text: Peter Popp
Stair Case Study House 05 Situation:
The top two storeys of an upper-middle-class house in the Art Nouveau style needed to be joined together into a generously-sized maisonette flat.
At first glance the new stairs make the impression of an ordinary double-flight half-turn staircase. However, a closer look shows that the lower part broadens into two staggered sections, thus opening up the oak staircase to the entrance to the flat.
Architect stairs: Gerd Streng
Location: 20148 Hamburg-Rotherbaum, Germany
Cost stairs: Euro 40,000
A classical detached house from 1937 was to undergo an energy efficiency upgrade as well as adaptation to the spatial requirements of a family of four.
In a purposeful intervention, it was possible to integrate a new staircase into the corridor of the upper floor and thus provide access to the previously unused pitched attic. The attic, which originally could only be reached by a ladder, now accommodates a light-flooded room that increases the house's net floor space from about 100 m² to approx. 116 m².
The new, single-flight staircase has been precisely incorporated into the ceiling opening for the former ladder. Space constraints determined the new staircase's dimensioning in that enough clear passage width had to be left for reaching the bathroom and bedrooms in the 1.30 m-wide corridor.
The stringer inclined at a 5° angle is the key to meeting all requirements. On the one hand the angle ensures a maximum clear passage width in the corridor; on the other, it resolves the difference in width between the starting step and the ceiling opening. The bend at the ninth step marks the start of the turn towards the opening into the attic. A handrail solution at the side offers six openings arranged vertically to be of the right height for all ages between small children and adults.
Four rooflights provide the attic with a base level of light, and an additional large rooflight above the staircase opening lets in daylight, thus enabling views up into the attic from almost three storeys below.
With the exception of the pointed gable walls, all the attic surfaces are clad in moisture-resistant oriented strand board, including the reveals of the five roof windows, the skirting boards and the apex trim. In combination with the GRP panels, the quality installation and workmanship of the seemingly "cheap" material lends the attic room a unique atmosphere.
Architect: Gerd Streng
Location: 22525 Hamburg-Langenfelde, Germany
total Euro 65,000
stairs Euro 5,500 More projects on this topic in DETAIL 4/2014 "Stairs, Ramps, Lifts"