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The P1 staircase design embraces a particularly broad range of visual styles, since it is defined by a structural PFC stringer frame entirely clad in other materials. As the photographs in this document demonstrate, architects and designers can let their imagination off the leash with respect to form and material types. High quality stone and polished timber inline cladding may be used to clad the PFC members with a sumptuous and graceful finish (see photo opposite). The photos on pages 5 and 9 illustrate how effective a creative approach to cladding can be, resulting in the generation of a ‘stacked block’ illusion.

Most balustrade types are suitable for use on the P1, but certain designs style do go together naturally, and the G1 and G2 (fully and semi- framed panel balustrade, respectively) work particularly well with P1. This is because the cladding required on the top face of the stringer members naturally serves as the bottom rail of the balustrade.

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Figure 1. PFC clad with aligned timber panels incorporating shadow line detail. Isometric overview of flight to void-edge interface section.

Figure 2. Side elevation. Shadow line details are designed to interface with connecting void edge balustrade or (in the example shown) void edge capping.

Figure 3. Detail A: Flight to void-edge concrete slab fixing.

Figure 4. Front elevation. Overall width of the flight is determined by the nominated traversable width and the clad stringer detail.

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F indicated on dimensions denotes a nominal dimension that typically varies according to specific application, engineering requirements or client preferences.

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Floor coverings(stone in this illustrative example)

Structural floor(concrete) surface

M16 threaded rod chemsetfixing to concrete

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Timber top capping

Overall staircase width

150 150Clad PFC stringers

Engineered concrete treads with stone veneerand folded steel bottom cover plate

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The main structural work of each flight is performed by two opposed PFC members. In U or L shaped staircases, cross bracing using minor members of a lighter gauge may be employed. Plates required for fixing to structural floor or wall faces are generally inset and welded to suit the PFC profile. Where continuing stringer members are joined, mitre welds are used, but right angle joins are commonly approached via a bolted connection.

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10mm shadow line

10mm shadow line

Bottom timber capping

Top timber capping

Outer timber panel

Inner timber panel intwo sections

Inner MDF core intwo sections

MDF core sections

PFC memberM16 fixing to concrete

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PFC to concrete connection byangle plate welded to PFCand chemset fixed to concrete

Routing in inner MDF and timberpanels to accept common tread

Routing in inner MDF and timberpanels to accept bottom tread

Void edge nosing

M16 threaded rod connections

Seam of butt joined panels

Mitre return of top timber capping

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Common treads

Bottom tread

Plaster line / bulkhead

Rise

Surface of floor coverings

Structural floor

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Stone tile tread surface finish

Stone edge trim

Stringer shadow line clear of tread nosing line

Custom folded steel plate withpainted or powdercoated finish

Snap-in clip to attachbottom cover

Solid concrete infill providesrigid support of stone tile

Steel reinforcing rod

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Figure 5. Clad PCF layers. The structural member is clad in MDF panels, with a final visual timber veneer that creates a shadow line detail on all four edges.

Figure 6. Lower isometric view of angle bracket fixing and inner cladding panels. Inner MDF and timber panels are built in upper and lower sections in order to wrap around the pre-installed tread plates.

Figure 7. Side elevation showing an illustrative example of a stone and folded metal tread style suitable for continuing a stone tile specification on flight treads. Most standard tread types can be used with the P1 clad PFC stringer.

Figure 8. Detail B: Stone and folded metal tread style with concrete and steel structural support.

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Figure 9. Inline angle bracket connection details. PFC is cut away in order to weld an in-line angle bracket that wraps around structural void edge.

Figure 10. Aligned timber panel–clad PFC construction summary.

Figure 11. PFC clad with vertical stepped timber box sections on lower flight and semi-sawtooth plaster sheeting on upper flight. Isometric overview.

PFC cutaway to placeangle support bracket

Fixings located to avoid interference with PFC and also to maintain appropriate

separation and distance from concrete edge

Bevelled edges of capping

Mitre return

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MDF painted on outer face toenhance shadow line

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Latham strip

Tread edge capping

Riser edge capping

Side plaster semi-sawtooth panel

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Enclosed lower flight provides concealment of services and storage space

Random box section design createsthe dominant design interest

Raised floor extends the visual space of the staircase12

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All box sectionedges mitred

Rubber riserveneer

Pine core

Overlapping butt-join

Painted MDF base13

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Structural floor level

Raised floor

Base of stepped timberbox sections

M16 rod chemsetfixing to concrete

Face of first compositeriser assembly

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Figure 12. Side elevation and plan. This design highlights one of the many ways in which structural PFC staircases can be clad in an original and striking manner, in order to play a specific role in the wider architectural design. Partial enclosure on the staircase puts the void beneath the lower flight to good use.

Figure 13. Isometric of lower flight showing stepped box section assembly and tread details.

Figure 14. Cut-away side elevation.

Figure 15. Detail A: Concrete floor fixing of lower flight stringer.

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E: Slip battens for fixingplaster to PFC

D: PFC to landing joistconnection tag E

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Tag to stringer gusset

Landing / riser support tagRisers aligned with

box section verticals

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Pine tread core fixedfrom underneath

Rise

Vertical tags supportlanding joists

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M16 rod chemsetfixing to concrete

Face of bulkhead plaster

MDF sheeting to underside of PFC

HorizontalPFC member

Landing support tag(hidden)

Fixing plate inset andwelded to PFCstringer member

Floor coverings

Landing joists

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Figure 16. Detail B: Concrete void edge fixing to landing PFC stringer.

Figure 17. Tread and landing support mechanisms.

Figure 18. Cutaway lower isometric view showing support methods for landing joists and upper flight plaster cladding.

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complianceArden is a BSA licensed contractor for carpentry, joinery, glass, glazing and aluminium as well as structural metal fabrication and erection. Arden supplies a Form 16 (Licensed Contractor) on all projects. In design and construct contracts, a Form 15 (Design Engineer) certification is supplied upon request. For products and services incorporating the P1 system, this table shows compliance with relevant codes and standards.

Key

Code Title Applicability

BCA The Building Code of Australia

AS NZS 1170.1-2002 Structural Design Actions – Permanent, imposed and other actions

AS 1288-2006 Glass in Buildings. Selection and installation.

AS NZS 1554.1-2004 Structural steel welding - Welding of steel structures

AS 1554.6-1994 Welding stainless steels for structural purposes

AS NZS 4586-2004 Slip resistance classification of new pedestrian surface materials

AS 1428.1-2009 Design for access and mobility

AS 1657-1992 Fixed platforms, walkways, stairways & ladders. Design, construction and installation

For all commercial applications, it is important that sufficient space for the stairwell cavity be allowed to satisfy Australian Standards and BCA requirements.

The footprint is primarily driven by the floor to floor rise, as well as the staircase configuration chosen. However, stringer and balustrade style design may increase the amount of space required. Allowing too small a cavity can restrict the design options of the staircase. Also, points at where the staircase interacts with other structures are best addressed early in the design cycle.

Consultation with Arden early on will help ensure that these design issues can be addressed in a cost-effective manner.

design note

About this document

Intellectual property is copyright © Archstairs Pty Ltd unless otherwise agreed in writing. All rights to the document are retained. Any use of the document by clients or third parties, unless specifically authorised by Archstairs Pty Ltd, are at their own risk and the user releases and indemnifies Archstairs Pty Ltd from and against all loss or damage arising from such use.

Key

full compliance with the codecan comply not applicable to this element

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