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Alternating Tread Stairs
Alternating Tread Stairs

    Alternating Tread Stairs

    4.9 out of 5 stars4.9(7 reviews)

    This stair solves:

    • Alternating Tread Stairs (alternating tread ladders) for rooftop access, mezzanine access, or crossover obstacles
    • Four types of Alternating Tread Stairs (alternating tread ladders): walk-thru, to roof hatch access, to a platform, or crossover with a platform in the middle
    • Uses less floor space (footprint), if not feasible to use standard stair
    • Easier climb than a vertical ladder
    • Users can face the direction of travel for ascent or descent

    Reduce Costs and Increase Quality

    Reduce maintenance costs by using an aluminum stair which is naturally corrosion resistant with minimal ongoing maintenance or upkeep compared to steel stairs that corrode over time.  Reduce installation costs by using an aluminum stair which is a third the weight of steel, so it is easier to install, requiring less equipment.  Aluminum is high strength and is used in planes, cars, trucks, buses, trains, and buildings.  

    Reduce Risks

    With over 75 years of experience providing access solutions, we know the codes and are experts in this area.  Units are built to meet or exceed OSHA 1910 Subpart D design criteria.  Without the correct stair, there could be injury, liability, and loss of money, which puts companies' reputations and lives at stake.  

    Aesthetically Pleasing and Sustainable Material

    The standard aluminum mill finish will not rust or stain the surrounding structure.  Powder Coating is available to match the surroundings or stand out for safety. Clear Anodizing is available to increase corrosion, abrasion, and wear resistance.  In addition, aluminum is 100 percent recyclable and retains its properties indefinitely.  

    Key Details of Stair

    • Fully Welded construction used throughout
    • 10" x 1/4" aluminum flat bar center stringer
    • 3" x 2" x 1/8" aluminum tubing side stringers
    • Treads are bar grating both welded and bolted to the center stringer, welded to side stringers
    • 1000-pound load capacity
    • Handrails on both sides, 1-1/4" Sch 40 Aluminum Pipe
    • 68 or 56-degree pitch
    • Tread widths of 11-7/8" for walk-thru stairs and 9-7/8" for hatch access stairs
    • Tread depths of 9-13/16" for 68-degree stairs and 11" deep for 56-degree stairs
    • Ladder Safety Post available for roof hatch exit
    • 5 Year Warranty
    Specification
    • SECTION 05 51 33.23

      ALTERNATING TREAD STAIRS

      PART 1 GENERAL

      1.1 SECTION INCLUDES

      A. Aluminum Alternating Tread Stairs.

      1.2 RELATED SECTIONS

      A. Section 05 12 00 - Structural Steel Framing: Roof structure and opening support.

      B. Section 05 55 00 - Metal Stair Treads and Nosings: Miscellaneous metal supports.

      C. Section 06 10 00 - Rough Carpentry: Roof framing and opening support.

      D. Section 07 42 00 - Wall Panels: Roof curb flashing.

      1.3 REFERENCES

      A. OSHA 1910.25: Stairways.

      1.4 SUBMITTALS

      A. Submit under provisions of Section 01 30 00.

      B. Manufacturer's data sheets on each product to be used, including:

      1. Preparation instructions and recommendations.

      2. Storage and handling requirements and recommendations.

      C. Shop Drawings for Stairs:

      1. Plan and section of stair installation.

      1.5 DELIVERY, STORAGE, AND HANDLING

      A. Store products in manufacturer's unopened packaging until ready for installation.

      B. Store stair until installation inside under cover. If stored outside, under a tarp or suitable cover.

      1.6 WARRANTY

      A. Limited Warranty: Five years against defective material and workmanship, covering parts only, no labor or freight. Defective parts, if deemed so by the manufacturer, will be replaced at no charge, freight excluded, upon inspection at manufacturer's plant which warrants same.

      PART 2 PRODUCTS

      2.1 MANUFACTURERS

      A. Acceptable Manufacturer: Precision Ladders, LLC, which is located at: P. O. Box 2279; Morristown, TN 37816-2279; Toll Free Tel: 800-225-7814; Tel: 423-586-2265; Fax: 423-586-2091; Web: www.PrecisionLadders.com

      B. Requests for substitutions will be considered in accordance with provisions of Section 01 60 00.

      2.2 ALUMINUM ALTERNATING TREAD STAIR

      A. Aluminum Alternating Tread Stair and Components: Stair, mounting brackets and handrails on both sides.

      1. Model: Model AT -*** (***= vertical height in inches) Aluminum Alternating Tread Stair as manufactured by Precision Ladders, LLC.

      2. Capacity: Unit shall support a 1,000 lb (227 kg) total load without failure.

      3. Degree of Incline: 56 or 68 degrees.

      4. Performance Standard: Units designed and manufactured to meet or exceed OSHA 1910.25.

      B. Components:

      1. Stair Side Stringers: 3 inch by 2 inch by 1/8 inch (76 mm by 51 mm by 3 mm) extruded 6005-T5 aluminum tubing. Pitch: 56 or 68 degrees.

      2. Stair Center Stringer: 10 inch by 1/4 inch (254 mm by 6 mm) extruded 6005-T5 aluminum flat bar. Note: Neoprene trim adhered to front edge of center stringer to protect climber.

      3. Stair Treads: 1 inch aluminum Bar Grating, 9 13/16” (249 mm) deep by 9 7/8”(250 mm) wide on hatch-access models (11 7/8” (302 mm) wide on Walk-thru models).

      4. Stair Mounting Brackets: 6 inch by 1/4 inch (153 mm by 6 mm) aluminum flat bar

      5. Handrails: 1-1/4 inches (32 mm) Schedule 40, 6005-T5 aluminum pipe provided with internal aluminum fittings.

      6. Finishes:

      a. Standard: Mill finish on aluminum stair components.

      b. Optional Finishes

      1. Powder Coated

      2. Clear Anodized

      2.3 FABRICATION

      A. Completely fabricate stair ready for installation before shipment to the site.

      PART 3 EXECUTION

      3.1 EXAMINATION

      A. If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

      B. Examine materials upon arrival at site. Notify the carrier and manufacturer of any damage.

      3.2 INSTALLATION

      A. Install in accordance with approved submittals.

      3.3 PROTECTION

      A. Protect installed products until completion of project.

      B. Touch-up, repair or replace damaged products before Substantial Completion.

      END OF SECTION

    Technical specification
    • Unique ref.alternating-tread-stairs
    • Product familyStairs
    • Product groupAlternating Tread
    • TypeObject (single object)
    • Date of publishing2021-08-26
    • Edition number1
    Related
    • Material mainAluminum
    • Designed inUnited States
    • Manufactured inUnited States
    Classification
    • BIMobject CategoryConstruction - Stairs
    • IFC classificationStair
    • Uniclass 2015 CodeEF_35_10
    • Uniclass 2015 DescriptionStairs
    • CSI MasterFormat 2014 Code05 51 00
    • CSI MasterFormat 2014 TitleMetal Stairs
    • OmniClass Number23-17 23 17
    • OmniClass TitleStairs
    • CSI UniFormat II CodeC2010
    • CSI UniFormat II TitleStair Construction

    Region availability

    North America
    Anguilla
    Antigua and Barbuda
    Aruba
    Barbados
    Belize
    Bermuda
    British Virgin Islands
    Canada
    Caribbean Netherlands
    Cayman Islands
    Collectivity of Saint Martin
    Costa Rica
    Cuba
    Curaçao
    Dominica
    Dominican Republic
    El Salvador
    Greenland
    Grenada
    Guadeloupe
    Guatemala
    Haiti
    Honduras
    Jamaica
    Martinique
    Mexico
    Montserrat
    Nicaragua
    Panama
    Puerto Rico
    Saint Kitts and Nevis
    Saint Lucia
    Saint Pierre and Miquelon
    Saint Vincent and the Grenadines
    Saint-Barthélemy
    Sint Maarten
    The Bahamas
    Trinidad and Tobago
    Turks and Caicos Islands
    U.S. Virgin Islands
    United States