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1998-06-10
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SECTION 05512
ALTERNATING TREAD METAL STAIRS
NOTE ** This section is based on products manufactured by
Lapeyre Stair, Inc., at the following address:
NOTE ** 220-R Laitram Lane, Harahan, LA 70123
NOTE ** Telephone: 1-800-535-7631 or 1-504-733-6009
NOTE ** FAX: 1-504 733-4393
NOTE **
NOTE ** The Lapeyre(R) Stair is a custom built, space-
saving industrial stair that meets OSHA
requirements for non-public access. The Lapeyre
Stair's alternating tread design provides greater
tread depth than vertical or ship's ladders while
taking up no more room than a ship's ladder.
University safety studies conclude that The Lapeyre
Stair is overwhelmingly safer than ship's ladders.
NOTE **
NOTE ** This section includes stairs made of aluminum,
galvanized steel, and stainless steel.
NOTE **
NOTE ** SECTION 05512 - ALTERNATING TREAD METAL STAIRS,
Copyright 1996, The Architect's Catalog, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Delete items below not required for project.
A. Prefabricated steel stairs with integral handrails.
B. Prefabricated steel platforms with integral handrails.
C. Prefabricated stainless steel stairs with integral
handrails.
D. Prefabricated stainless steel platforms with integral
handrails.
E. Prefabricated aluminum stairs with integral handrails.
F. Prefabricated aluminum platforms with integral handrails.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 05500 - Metal Fabrications: Miscellaneous
bracing and anchorage.
B. Section 05510 - Metal Stairs: Conventional prefabricated
metal stairs.
C. Section 09900 - Paints and Coatings.
1.3 REFERENCES
A. ASTM A 123 - Standard Specification for Zinc (Hot Dip
Galvanized) Coatings on Iron and Steel Products.
B. ASTM A 307 - Standard Specification for Carbon Steel
Bolts and Studs, 60,000 PSI Tensile Strength.
C. ASTM A 513 - Standard Specification for Electric-
Resistance-Welded Carbon and Alloy Steel Mechanical
Tubing.
D. ASTM A 563 - Standard Specification for Carbon and Alloy
Steel Nuts.
E. ASTM A 569/A 569M - Standard Specification for Steel,
Carbon (0.15 Maximum, Percent), Hot-Rolled Sheet and
Strip Commercial Quality.
F. ASTM A 780 - Standard Practice for Repair of Damaged and
Uncoated Areas of Hot-Dip Galvanized Coatings.
1.4 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Provide manufacturer's installation
instructions.
C. Shop Drawings: Submit dimensioned prints showing
critical dimensions, jointing and connections, and
fasteners provided by manufacturer.
PART 2 PRODUCTS
2.1 MANUFACTURER
A. Provide pre-engineered alternating tread metal stairs
fabricated by Lapeyre Stair, Inc., 220-R Laitram Lane,
Harahan, LA 70123. Telephone 1-800-535-7631 or 1-504-733-
6009. FAX 1-504-733-4393.
B. Substitutions will not be acceptable.
2.2 MANUFACTURED UNITS
A. Alternating Tread Stairs: Alternating treads with center
stringer.
NOTE ** Delete all but one of the following material
descriptions. If more than one stair of different
materials is required, edit these descriptions to
indicate which stairs are made of which material.
1. Material: Galvanized steel.
2. Material: Aluminum, natural finish.
3. Material: Stainless steel, natural finish.
NOTE ** Delete the following factory paint finish if not
required.
4. Finish: Manufacturer's standard safety yellow powder
coating.
5. Stair treads: Capable of withstanding a concentrated
1,000 pound load without deformation.
6. Risers spaced equally to within 3/16 inch for
adjacent risers and to within 3/8 inch for any two
non-adjacent risers.
7. Handrail: Capable of withstanding a load of 200
pounds applied in any direction at any point on the
rail.
8. Handrails contoured for body guidance and underarm
support.
NOTE ** Select at least one of the three angle requirements
below and delete the others.
9. Steel stair angle: 56 degrees from horizontal.
10. Steel stair angle: 68 degrees from horizontal.
11. Aluminum stair angle: 68 degrees from horizontal.
NOTE ** Delete one of the following vertical drop
descriptions. If not shown on the drawings enter a
specific distance in the blank.
12. Vertical Drop: Distance between upper finished floor
surface where top landing will be attached and lower
finished floor surface as indicated on Drawings.
13. Vertical Drop: Distance between upper finished floor
surface where top landing will be attached and lower
finished floor surface of ______________.
NOTE ** Edit the materials below to conform to project
requirements. Coordinate with material
description(s) included above.
B. Structural Steel Components: 1010/15, per ASTM A 569/A
569M, size and gage to meet performance requirements and
project dimensions.
1. Treads: 13 gage HRPO.
2. Stair Landings and Foot Stampings: 11 gage.
3. Stringers: 2 inch by 1-3/4 inch by 11 gage.
NOTE ** Select stringers above for 56 degree stairs under
10 vertical feet and 68 degree stairs under 12
vertical feet. Select stringers below for greater
vertical drops up to 20 feet maximum.
4. Stringers: 3 inch by 1-3/4 inch by 11 gage.
5. Platforms: CS, 3/16 inch diamond safety plate.
C. Steel Handrails: 1010/15 CS per ASTM A 569/A 569M, cold
drawn, fully annealed tube per ASTM A 513, 1-1/2 inches
OD by 0.083 inch.
D. Stainless Steel Structural Components: Type 304 SS, size
and gage to meet performance requirements.
1. Treads: 13 gage.
2. Landings and Foot Stampings: 11 gage.
3. Stringers: 2 inch by 1-3/4 inch by 11 gage.
NOTE ** Select stringers above for 56 degree stairs under
10 vertical feet and 68 degree stairs under 12
vertical feet. Select stringers below for greater
vertical drops up to 20 feet maximum.
4. Stringers: 3 inch by 1-3/4 inch by 11 gage.
5. Platforms: 3/16 inch diamond safety plate.
E. Stainless Steel Handrails: Type 304 SS cold drawn, fully
annealed tube per ASTM A 513, 1-1/2 inches OD by 0.065
inch.
F. Aluminum Landings, Treads, and Foot Castings: Aluminum
Alloy F356F.
G. Aluminum Stringer: Aluminum Alloy 6063-T52, box shape, 1-
3/4 inch by 4 inch by 1/8 inch.
H. Aluminum Handrails: Aluminum Alloy 6063-T4 Tube, 1-1/2
inches OD by 1/8 inch.
I. Aluminum Platforms: Aluminum Alloy 5086 (H112 or
equivalent), 1/4 inch diamond safety plate.
J. Aluminum Platform Handrail Clamps: Cast aluminum
(F356F).
K. Miscellaneous Materials:
1. Rubber spine: Hollow neoprene.
2. Rubber foot divider: Santoprene (Type 101-73).
3. Bolts: ASTM A 307.
4. Nuts: ASTM A 563.
2.3 FABRICATION
A. Fabricate components to comply with performance and
design requirements specified and in accordance with
approved shop drawings. Fabricate to minimize field
assembly.
B. Steel Stairs: Fabricate by gas metal arc welding, with
stamped steel treads spot-welded to stringers.
1. Provide custom-fabricated steel handrails for field
bolting to prefabricated stair unit.
2. Provide handrail design to accommodate field
conditions indicated on Drawings.
C. Stainless Steel Stairs: Fabricate by gas tungsten arc
welding or gas metal arc welding, with stamped steel
treads spot-welded to stringers.
1. Provide custom-fabricated stainless steel handrails
for field bolting to prefabricated stair unit.
2. Provide handrail design to accommodate field
conditions indicated on Drawings.
D. Aluminum Stairs: Provide all welded construction, using
gas metal arc welding or gas tungsten arc welding.
Fabricate using cast aluminum treads and cast aluminum
mounting plates; shop weld handrails to stair assembly.
E. Platforms: Provide cut, formed, and punched platforms
with mounting brackets and kickplates, configured and
sized as indicated on Drawings.
1. Steel construction: Fabricate using gas metal arc
welding.
2. Stainless steel construction: Fabricate using gas
tungsten arc welding or gas metal arc welding.
3. Aluminum construction: Fabricate using gas tungsten
arc welding or gas metal arc welding.
4. Handrails: Provide bolt-on handrails of same
material as platform construction.
F. Galvanizing: Hot-dip galvanize steel components in
accordance with ASTM A 123.
PART 3 EXECUTION
3.1 EXAMINATION
A. Verify that dimensions are correct and substrate is in
proper condition for installation of metal stair
components. Do not proceed with installation until
unsatisfactory conditions have been corrected.
3.2 PREPARATION
NOTE ** Delete the following paragraph if all stairs are
aluminum.
A. Install handrails to stair unit, using bolts furnished
with stair unit by manufacturer.
B. Prepare mounting holes, using drawings supplied by stair
manufacturer.
3.3 INSTALLATION
A. Position stair units with top tread at same elevation as
finished floor or roof surface.
B. Verify that stairs are properly aligned with building
construction, at correct angle, and free from distortion.
Secure in position using not fewer than two bolts or
studs at top and two at bottom.
C. Install crossover or landing platform with stair,
securing with two bolts and handrail clamps. Bolt
handrails in place.
D. Do not field cut or alter members.
3.4 ADJUST AND CLEAN
A. Touch up damage to galvanized surfaces using galvanizing
repair paint in accordance with ASTM A 780.
NOTE ** Delete paragraphs above and below if project
requires only aluminum or stainless steel stairs.
B. Touch up abraded areas on shop paint immediately after
erection, using matching paint.
C. Clean work area of debris associated with installation of
alternating tread metal stairs.
END OF SECTION