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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
-