design element: a3 - treads
DESCRIPTION
This is a reference guide to standard treads used in the Arden Elements range.TRANSCRIPT
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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.
design
STT-1
Solid timber tread
CP 1
SST-1.ipt
165
rise
Nom
inal
250
Going
42Tr
ead
thic
knes
s
280
Tread width
R6
Gap between treads mustnot excede 125mm
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STT-2
Solid timber tread with non-slip strip
STTR-1
Solid timber tread with riser board
B
P 2 SST-2.ipt
160
Ris
e N
omin
al
275
Going
Gap between treads mustnot excede 125mm
Rebated non-slip strip
300
Tread width
R6
42Tr
ead
thic
knes
s
A
P 3 SST-3a.ipt
Rebated non-slip strip
Applied nosing bonded to treads.This reduces tread to tread gap
to less than 125mm.
End of nosingbevilled to treadfor open edged
stair design.
120
60
180
rise
Nom
inal
300
Tread width
32
19
STT-3
Solid timber tread with non-slip strip and applied nosing with bevelled ends for mono-stringer application
G
19
Riser th
ickness
P 4 SSTR-1.ipt
32
Tread thickness
180
rise
Nom
inal
Expressed Joint
270
Going
R6
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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.
technical
STTR-2
Solid timber tread with riser board and non-slip strip over nosing
E
270
Going
32
Tread
thickness
P 5 SSTR-2.iam
Rebated non-slip stripoverlaps nose to reduce wear.Strip also conceals screw heads.
Expressed Joint
180
rise
Nom
inal
19
Riser thickness
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J
P 6 SSTR-3.ipt
19
Riser th
ickness
270
Going
180
rise
Nom
inal
32
Tread
thickness
Rebated non-slip strip
STTR-3
Solid timber tread with riser board and non-slip strip back from nosing
STTR-4
Solid timber tread with raked riser board
STTR-5
Solid timber tread with riser board and applied nosing
H
P 7 SSTR-4.iam
Expressed Joint
Rebated non-slip stripoverlaps nose to reduce wear.Strip also conceals screw heads.
Raked riser
84.0°
270
Going
180
rise
Nom
inal
32
Tread
Thickness
19
Riser
Thickness
K
P 8 SSTR-5.ipt
270
Going
180
rise
Nom
inal
32
Trea
dth
ickn
ess
19
Riser
thickness
42
Nosing
depth
19
Nosing
thickness
Shown with returnnosing for exposed edge
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LTT-1
Laminated timber tread
LTT-2
Laminated timber tread with non-slip strip and resilient insert
LTT-3
Laminated timber tread with embedded support plate
L
P 9 LTT-1.ipt
275
Going
53
Tread
thickness
300
Tread width
173
rise
Nom
inal
MDF or ply core
Dress wood 19mm"picture frame" nosing
Dress wood veneertop and bottom
N
P 10 LTT-2a.ipt
Dress wood veneertop and bottom
MDF or ply core
Dress wood19mm "pictureframe" nosing
Rebated non-slip strip
250Going
170
rise
Nom
inal
Resilient insert forhigh traffic stairs
53
Tread
thickness
30
Overlap
P
P 11 LTT-3.ipt
180
Ris
e N
omin
al
270
Going
62
Trea
dth
ickn
ess
300
Tread width Full width steel supportplate connects tostringers on each side
3 piece tread is assembledaround steel tread plate
LTT-1
Laminated timber tread
LTT-2
Laminated timber tread with non-slip strip and resilient insert
LTT-3
Laminated timber tread with embedded support plate
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N
P 10 LTT-2a.ipt
Dress wood veneertop and bottom
MDF or ply core
Dress wood19mm "pictureframe" nosing
Rebated non-slip strip
250Going
170
rise
Nom
inal
Resilient insert forhigh traffic stairs
53
Tread
thickness
30
Overlap
R
P 12 LTT-4.ipt
3 piece tread is assembledaround steel tread plate
Full width steel supportplate connects tostringers on each side
270
Going
180
rise
Nom
inal
30
Overlap 62
Tread
thickness
Rebated non-slip strip
LTT-4
Laminated timber tread with embedded support plate and non-slip strip
LTT-5
Laminated timber tread with embedded SHS supports
LTT-6
Laminated timber tread with non-slip strip folded tread plate and full width resilient insert
T
P 13 LTT-5.iam
180
rise
Nom
inal
67
Trea
dth
ickn
ess
270
Going 360
Tread width
40mm SHS supports strengthentread and attach to stringer
MDF or ply core
Dress wood veneertop and bottom
Dress wood 19mm"picture frame" nosing
AE
P 14 LTT-6.ipt
270
Going
180
rise
Nom
inal
MDF or ply core
75
front of st
air
Visual th
ickness
Folded steel tread platetypically welded to steelstringer at sides
Resilient insert forhigh traffic stairs
Non-slip strip
Dress wood nosing bonded to core
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LTT-1
Laminated timber tread
LTT-2
Laminated timber tread with riser boards visual soffit with non-slip strip
LTTR-3
Laminated timber tread with riser boards non-visual soffit
LTTR-2
U
P 15 LTTR-1.ipt
180
rise
Nom
inal
270
Going
62
Tread
thickness
62
Riser
thickness
MDF orply core
Dress wood topveneer and riser
R6
Dress wood end cappingfor exposed edge stair
Dress wood bottom veneerfor stairs with visible underside
V
P 16 LTTR-2.ipt
180
rise
Nom
inal
270
Going
62
Tread
thickness
62
Riser
thickness
Dress wood end cappingfor exposed edge stair
Dress wood topveneer and riser
Dress wood bottom veneerfor stairs with visible underside
MDF orply core
Rebatednon-slip
strip
W
P 17 LTTR-3.ipt
180
rise
Nom
inal
MDF orply core
Dress wood topveneer and riser
270
Going
47
Tread
thickness
47
Riser
thickness
R6
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LTTR-4
Laminated timber tread with embedded support plate and non-slip strip
SBTT-1
Stack block tread interior
SBTT-2
Stack block tread exterior
Y
P 18 LTTR-4.ipt
180
rise
Nom
inal
Dress wood topveneer and riser
MDF or ply core
270
Going
47
Riser
thickness47
Tread
thickness
Rebated non-slip strip
AG
P 19 SBTT-1.ipt
180
rise
Nom
inal
Going 270
Rebatednon-slip strip
Steel stringer withtread & soffitsupport plates.
Soffit, treads and side returnscompletely enclose stringer
13
18
AB
P 20 SBTT-1.ipt
180
rise Nom
inal
270
Going
Shadow lines on returnsand riser boards visually
seperate treads to create"Stack Block" appearance
1017
0
10
Rebatednon-slip strip
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RST-1
Reconstituted stone tread welded steel support
RST-2
Reconstituted stone tread reinforced concrete support
CTT-1
Ceramic tile covered tread reinforced concrete support
AC
P 21 RST-1.ipt
180
rise
Nom
inal
300
Tread width
270
Going
Reconstituted stone tread
Non-slip ribs
Welded steel support plate
40
20
65
115
AD
P 22 RST-2.ipt
180
rise
Nom
inal
Non-slip ribs
Reconstitutedstone tread
Folded steel trough containsthe reinforced concrete
RebarReinforcedconcrete
270
Going
1.2mm zinc annealed steel snap cover soffit.
Powder coated to customer requirements
4094
AF
P 23 CTT-1.ipt
180
rise
Nom
inal
Folded steel troughpowder coated to suit
Non-slip stripRebar
Reinforcedconcrete
Ceramic Tiles
Grout
270
Going
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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. Please see specific product technical data sheets to check level of compliance with relevant codes and standards.
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
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