Appendix 3 – Treads
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design elements
Appendix 3 – Treads
design This is a reference guide to standard treads used in the Arden Elements range. Many custom staircases will demand their own unique tread design. Also, new developments in architectural flooring materials and slip-resistant strips naturally ensure that tread specifications are in a continual state of evolution. This appendix can be used in conjunction with other Arden technical data sheets to aid in the specification process. Most tread designs listed here are specified to work with other Arden staircase or stringer elements. It is our hope that it may be used by architects to help with preliminary tread specification early in the design process. As with all aspects of staircase design, tread specifications may need to be altered to meet site-specific requirements.
Gap between treads must not excede 125mm
A3
R6
Go T re
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in g
25
w id ad
0
th
28
0
Tread thickness 42
Solid timber tread
Nominal rise 165
STT-1
STT-2
Nominal Rise 160
Solid timber tread with non-slip strip
R6
P3 SST-3a.ipt
Go T
in g
d rea
27
w id
Tread thickness 42
Rebated non-slip strip
5
th
30
0
STT-3
19
32
End of nosing bevilled to tread for open edged stair design.
60
Rebated non-slip strip
T re
ad
wi
30 d th
P4 SSTR-1.ipt
0
STTR-1
R6
Expressed Joint
0
Nominal rise 180
27
Solid timber tread with riser board
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in g
Solid timber tread with non-slip strip and applied nosing with bevelled ends for mono-stringer application
120
Nominal rise 180
Applied nosing bonded to treads. This reduces tread to tread gap to less than 125mm.
Go
Appendix 3 – Treads
G Gap between treads must not excede 125mm
T re
th i er R is
ck n
ess
19
th i ad
ckn
e ss
32
A
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Appendix 3 – Treads
technical Several standard solid timber tread (STT) specifications are shown, some incorporating slip-resistant strips and/or applied nosings. Solid timber treads with risers (STTR) also show options for either vertical or raked riser boards. Laminated timber treads (LTT) involve a composite construction and may be selected for greater thickness or stability. Alternatively they may be required due to the specification of rubber or vinyl on the top surface, and/or to allow for the incorporation of structural steel supports that are fixed to stringers. Some of these designs incorporate applied edge trim as well as nosings. Laminated timber treads with risers (LTTR) may be designed with the bottom faces of the treads to be visual or non-visual. The stack block tread (SBT) is a special design that represents a method of cladding a stringer in order to create an illusion of stacked blocks. The diagrams showing reconstituted stone treads (RST) and ceramic tile covered treads (CTT) illustrate typical ways of approaching this kind of floor surface on treads.
STTR-2
Expressed Joint
Solid timber tread with riser board and non-slip strip over nosing Go
in g
27
0
Nominal rise 180
A3 Ri
th i ser
ck n
ess
19
ad Tre ess ck n th i 32
Rebated non-slip strip overlaps nose to reduce wear. Strip also conceals screw heads.
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Solid timber tread with riser board and non-slip strip back from nosing
in g
27
0
Nominal rise 180
Go
R is
er
ck th i
ne
ss
19
P7 SSTR-4.iam
ad Tre ess ck n th i 32
Appendix 3 – Treads
STTR-3
Rebated non-slip strip
STTR-4 Expressed Joint
Solid timber tread with raked riser board
Raked riser .0 °
Nom inal rise 180
84
Go
in g
27
0
P8 SSTR-5.ipt
ad T ren e ss ic k T h 32 s r se es R i ick n h T 19
Rebated non-slip strip overlaps nose to reduce wear. Strip also conceals screw heads.
STTR-5
27
0
g s in s No knes c th i 19
Tread thickness 32
in g
A3
Go
Nom inal rise 180
Shown with return nosing for exposed edge
Solid timber tread with riser board and applied nosing
g s in N o th p de 42
er s R is k n e s c th i 19
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Laminated timber tread
Dress wood 19mm "picture frame" nosing Dress wood veneer top and bottom
Nominal rise 173
Appendix 3 – Treads
LTT-1
ad Tre ess ck n th i 5 3
Go Tre
LTT-2 Laminated timber tread with non-slip strip and resilient insert
in g
27
w id ad
5
th
30
0
MDF or ply core
Resilient insert for high traffic stairs Rebated non-slip strip Dress wood 19mm "picture frame" nosing Nominal rise 170
ad T re e ss n k c th i 53
Ov
in g Go 0 5 2
e rl
ap
30
Dress wood veneer top and bottom MDF or ply core
LTT-3 3 piece tread is assembled around steel tread plate
Tread thickness 62
A3
Nominal Rise 180
Laminated timber tread with embedded support plate
Go T re
6
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27
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h id t
30
0
Full width steel support plate connects to stringers on each side
Laminated timber tread with embedded support plate and non-slip strip Nominal rise 180
3 piece tread is assembled around steel tread plate
P 10 LTT-2a.ipt
O
Go
in g
27
0
P 13 LTT-5.iam
d rea s 0T n e s p 3h ick a l r t 62 ve
Appendix 3 – Treads
LTT-4
Full width steel support plate connects to stringers on each side
Rebated non-slip strip
LTT-5
Dress wood 19mm "picture frame" nosing
Laminated timber tread with embedded SHS supports
Nominal rise 180
Dress wood veneer top and bottom
Tread thickness 67
P 14 LTT-6.ipt
Go
in g T
27
d re a
0 w id
th
36
0
MDF or ply core
40mm SHS supports strengthen tread and attach to stringer
LTT-6
Dress wood nosing bonded to core
Laminated timber tread with non-slip strip folded tread plate and full width resilient insert
Resilient insert for high traffic stairs Non-slip strip
R
Nominal rise 180
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ess ckn 5 t h i a ir 7 l ua st V is t o f n fr o
Go
in g
27
0
MDF or ply core
Folded steel tread plate typically welded to steel stringer at sides
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Laminated timber tread
Dress wood end capping for exposed edge stair
Nominal rise 180
Appendix 3 – Treads
LTT-1
Dress wood top veneer and riser Go
in g
27
0
MDF or ply core
R6
ad T re e ss kn c i th 62
er R is e s s kn c i th 6 2
Dress wood bottom veneer for stairs with visible underside
LTTR-2 LTT-2 Laminated timber tread with riser boards visual soffit with non-slip strip
Dress wood end capping for exposed edge stair
Rebated non-slip strip
Nominal rise 180
Dress wood top veneer and riser
Go
in g
27
0
MDF or ply core
ad T re e ss kn c i th 6 2
er R is e s s ckn th i 6 2
Dress wood bottom veneer for stairs with visible underside
LTTR-3 Laminated timber tread with riser boards non-visual soffit
Dress wood top veneer and riser
A3
Go
in g
27
0
Nominal rise 180
R6
ad Tre ess ck n th i 4 7 er R is e s s ck n th i 47
MDF or ply core
8
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in g
Nominal rise 180
Go
Laminated timber tread with embedded support plate and non-slip strip
0 27
er R is e s s ck n th i 47
P 19 SBTT-1.ipt
ad T re e ss kn c i th 4 7
Appendix 3 – Treads
LTTR-4 Dress wood top veneer and riser
Rebated non-slip strip MDF or ply core
SBTT-1
Rebated non-slip strip
Stack block tread interior
Nominal rise 180
18
Going 270
Steel stringer with tread & soffit support plates. 13
P 20 SBTT-1.ipt
Soffit, treads and side returns completely enclose stringer
SBTT-2 Stack block tread exterior 27
0
170
10 Nom inal rise 180
in g
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10
Go
Rebated non-slip strip
Shadow lines on returns and riser boards visually seperate treads to create "Stack Block" appearance
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AF
Reconstituted stone tread welded steel support
Reconstituted stone tread
Go
27
0
w id
th
in g
65
115
Nominal rise 180
Non-slip ribs
20
Appendix 3 – Treads
RST-1
40
T
d re a
30
0
Welded steel support plate
RST-2 Reconstituted stone tread reinforced concrete support
1.2mm zinc annealed steel snap cover soffit. Powder coated to customer requirements
Go
in g
27
0
40
94
Nominal rise 180
Reconstituted stone tread
Reinforced Rebar concrete Non-slip ribs Folded steel trough contains the reinforced concrete
CTT-1 Ceramic tile covered tread reinforced concrete support Go
in g
27
0
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Grout
Nominal rise 180
Ceramic Tiles
Reinforced Rebar concrete Non-slip strip Folded steel trough powder coated to suit
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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.
Appendix 3 – Treads
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. Please see specific product technical data sheets to check level of compliance with relevant codes and standards.
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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.
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