Clad PFC Stringer
P1
design elements
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.
A 2
Timber top capping Shadow line Floor coverings (stone in this illustrative example)
Structural floor (concrete) surface
3
P1
Figure 2. Side elevation. Shadow line details are designed to interface with connecting void edge balustrade or (in the example shown) void edge capping.
12mm fixing plate
120 min
Figure 1. PFC clad with aligned timber panels incorporating shadow line detail. Isometric overview of flight to void-edge interface section.
60 min
60 min
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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M16 threaded rod chemset fixing to concrete
Clad PFC stringers 150
Figure 3. Detail A: Flight to void-edge concrete slab fixing.
150 Overall staircase width
Figure 4. Front elevation. Overall width of the flight is determined by the nominated traversable width and the clad stringer detail.
F indicated on dimensions denotes a nominal dimension that typically varies according to specific application, engineering requirements or client preferences.
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Engineered concrete treads with stone veneer and folded steel bottom cover plate
Tread rise
Clad PFC Stringer
design
Clad PFC Stringer
P1
3
design elements
Clad PFC Stringer
technical
Top timber capping
Inner timber panel in two sections
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.
10mm shadow line Inner MDF core in two sections
MDF core sections
Outer timber panel
10mm shadow line
Bottom timber capping M16 fixing to concrete
PFC member
5
Mitre return of top timber capping Void edge nosing
Routing in inner MDF and timber panels to accept common tread
Seam of butt joined panels
Routing in inner MDF and timber panels to accept bottom tread PFC to concrete connection by angle plate welded to PFC and chemset fixed to concrete
M16 threaded rod connections
6
B
Structural floor
Common treads
Bottom tread
Plaster line / bulkhead
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Surface of floor coverings
Rise
P1
Rise
Going
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.
Clad PFC Stringer
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 8. Detail B: Stone and folded metal tread style with concrete and steel structural support.
Stone tile tread surface finish
Stringer shadow line clear of tread nosing line
Stone edge trim
P1
Snap-in clip to attach bottom cover Steel reinforcing rod Custom folded steel plate with painted or powdercoated finish Solid concrete infill provides rigid support of stone tile
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design elements
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5
Clad PFC Stringer
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.
Bevelled edges of capping
Figure 10. Aligned timber panel窶田lad PFC construction summary.
PFC cutaway to place angle support bracket
Figure 11. PFC clad with vertical stepped timber box sections on lower flight and semi-sawtooth plaster sheeting on upper flight. Isometric overview.
MDF painted on outer face to enhance shadow line Fixings located to avoid interference with PFC and also to maintain appropriate separation and distance from concrete edge
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P1 6
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Mitre return
Clad PFC Stringer
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10 Latham strip Tread edge capping Riser edge capping Side plaster semisawtooth panel
F F
P1
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design elements
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Clad PFC Stringer
Random box section design creates the dominant design interest
Enclosed lower flight provides concealment of services and storage space
Raised floor extends the visual space of the staircase
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12 Rubber riser veneer
G
H
All box section edges mitred
G
Pine core
Overlapping butt-join
Painted MDF base
13
H
P1
B
13 C
A 14
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Raised floor
Base of stepped timber box sections
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Structural floor level
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.
140
M16 rod chemset fixing to concrete
Figure 14. Cut-away side elevation.
Clad PFC Stringer
0 20
Face of first composite riser assembly
Figure 15. Detail A: Concrete floor fixing of lower flight stringer. 15
15
P1 design elements
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Floor coverings
Figure 17. Tread and landing support mechanisms.
M16 rod chemset fixing to concrete
75
Landing joists Landing support tag (hidden)
Figure 18. Cutaway lower isometric view showing support methods for landing joists and upper flight plaster cladding.
57
Clad PFC Stringer
Figure 16. Detail B: Concrete void edge fixing to landing PFC stringer.
Horizontal PFC member
Fixing plate inset and welded to PFC stringer member
MDF sheeting to underside of PFC
Face of bulkhead plaster
16
Pine tread core fixed from underneath Landing / riser support tag
Risers aligned with box section verticals
Rise
Tag to stringer gusset
Vertical tags support landing joists
EQ
EQ
17
P1
D: PFC to landing joist connection tag
E
D
E: Slip battens for fixing plaster to PFC 18
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Intellectual property is copyright Š 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.
Clad PFC Stringer
About this document
compliance Arden 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 full compliance with the code can comply not applicable to this element
Code
Title
BCA
The Building Code of Australia
Applicability
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
P1
design note 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 elements
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