Automatic Super Simplex Disappearing StairAutomatic Super Simplex Disappearing Stair
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Automatic Super Simplex Disappearing Stair

This stair solves:

  • Automatic Super Simplex Disappearing Stairways (attic stairs or attic ladders) for roof hatch access, mezzanine access, or attic access
  • Three frame types to accommodate different ceiling types: deep angle frame, standard box frame, and deep box frame
  • Maximize floor space (disappears into ceiling when not in use)
  • Easier climb than a vertical ladder
  • Fully automatic, no manual assistance required

Increase The Quality of Climb for Your End-User

Built for the commercial and industrial end-user in mind by implementing deeper treads, wider clear width, and easier angle of climb.  The frame is built out of steel to ensure long-life durability.  The stair is built out of aluminum to reduce maintenance costs because it is naturally corrosion resistant with minimal ongoing maintenance or upkeep compared to steel stairs that corrode over time.  The aluminum stair is a third the weight of steel, so it is easier to install, requiring less equipment and any end-user can open and close.  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 ANSI A14.9 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 Materials

The standard aluminum components are mill finish and will not rust.  You can paint the door of the unit to match your surroundings.  In addition, aluminum is 100 percent recyclable and retains its properties indefinitely.  

Key Details of Stair

  • Fully automatic by electric motor and cables
  • Battery Backup so it will always work even if the power is out
  • 5" x 1" x 1/8" aluminum channel stringers, unit rated at 500 lbs
  • 5 3/16" x 1-1/4" x 1/8" aluminum channel treads, treads tested to 1000 lbs each
  • Treads are deeply serrated riveted to the stringer, rivets rated at 1100 lbs each
  • Handrail on the right side (at top)
  • 63-degree pitch
  • The opening width of 30" (fixed)
  • 1 Year Warranty
  • Operates from above or below ceiling level by push of a button
  • SECTION 11 33 00




    A. Automatic disappearing stairways.


    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.


    A. ANSI A14.9: Safety Requirements for Ceiling Mounted Disappearing Climbing Systems.


    A. Submit under provisions of Section 01300.

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

    1. Preparation instructions and recommendations.

    2. Storage and handling requirements and recommendations.

    3. Installation methods.

    C. Shop Drawings for Stairs:

    1. Plan and section of stair installation.

    2. Indicate rough opening dimensions for ceiling and/or roof openings.


    A. Store stairway until installation inside under cover in manufacturer's unopened packaging. If stored outside, under a tarp or suitable cover.

    1.6 WARRANTY

    A. Limited Warranty: One year against defective material and workmanship, covering parts only. Defective parts, as deemed by the manufacturer, will be replaced at no charge, freight excluded, upon inspection at manufacturer's plant.



    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:

    B. Requests for substitutions will be considered in accordance with provisions of Section 01600.


    A. Automatic Disappearing Stairway and Components: Stair, frame, stringers, treads, railing, motor and finishes.

    1. Model: Model S4*** (***=height in vertical inches) for stairs with ceiling heights of 8’-0” – 13’-6” (2438 mm – 4115 mm). Automatic Super Simplex Disappearing Stairway as manufactured by Precision Ladders, LLC.

    2. Capacity: Unit shall support a 500 lb (227 kg) total load without failure.

    3. Degree of Incline: 63 degrees.

    4. Performance Standard: Unit shall comply with ANSI A14.9; Commercial Type, for a rough opening of 30 inches (762 mm) and Residential Type, for a rough opening of 30 inches (762 mm).

    B. Components:

    1. Ceiling Opening:

    a. Ceiling height of 9’-9” (2972 mm) or less requires an opening of 30 inches by 54 inches (762 mm by 1372 mm).

    b. Ceiling heights from 9’-10” – 12’-0” (2997 mm by 3658 mm) require opening of 30 inches by 64 inches (762 mm by 1626 mm).

    c. Ceiling heights from 12’-1” – 13’-6” (3683 mm – 4115 mm) require opening of 30 inches by 72 inches (762 mm by 1829 mm).

    2. Stairway Stringer: 5 inch by 1 inch by 1/8 inch (127 mm by 25 mm by 3 mm) extruded 6005-T5 aluminum channel; tri-fold design; steel blade type hinges; adjustable feet with rubber rollers.

    3. Stairway Treads: 5 3/16 inch by 1-1/4 inch by 1/8 inch (132 mm by 32 mm by 3 mm) extruded 6005-T5 aluminum channel. Depth is 5-3/16 inches (132 mm). Deeply serrated top surface. Riser Height: 9-1/2 inches (241 mm). Clear Tread Width for Standard Width: 16-1/2 inches (419 mm).

    4. Railing: Aluminum tube, upper section only.

    5. Frame:

    a. If ceiling to floor (or roof deck) above is under 12 inches (305 mm), frame shall be 1/8 inch (3 mm) steel formed channel, box.

    b. When ceiling to floor (or roof deck) above is 12 inches (305 mm) or greater, the frame shall be 1/8 inch (3 mm) steel, 63 degrees (with built-in steps) on the hinge end, 90 degrees on the other end, custom depth to fill distance from ceiling to floor above. This custom frame will require a longer opening in the floor above than is required at the ceiling level.

    c. When exit is to a roof deck, the frame must be 39 inches (991 mm) deep.

    6. Door Panel:

    a. Standard (non-fire rated) door shall be constructed of 1/8 inch (3 mm) aluminum sheet attached to stairway frame with a steel piano hinge. Door overlaps bottom flange of frame.

    7. Hardware:

    a. Steel blade type hinge connecting stringer sections. Zinc plated and chromate sealed.

    b. Steel operating arms, both sides. Zinc coat with clear trivalent chromate.

    c. Double acting steel springs and cable, both sides.

    d. Rivets rated at 1,100 lb (499 kg) shear strength each.

    e. Steel section alignment clips at stringer section joints.

    f. Molded rubber guards at corners of aluminum door panel.

    8. Motor: 110 volt.

    9. Finishes: Mill finish on aluminum stairway components. Prime coat on frame.

    C. Accessories:

    1. Keyless Keypad Operation (Standard).

    2. Push Button Operation (Standard – to open from above).

    3. Battery Back-up (Standard).

    4. Emergency Release Cable (Standard). Ensure the cable is accessible from ground floor.


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



    A. Do not begin installation until rough opening and structural support have been properly prepared.

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

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


    A. Install in accordance with manufacturer's instructions and approved submittals.

    B. A 110-volt power source is required to power motor.


    A. Protect installed products until completion of project.

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


Technical specification
  • Unique ref.automatic-super-simplex
  • Collection setStairs
  • CollectionAutomatic Disappearing
  • TypeObject (single object)
  • Date of publishing2021-08-26
  • Edition number1
  • Material mainAluminium
  • Designed inUnited States
  • Manufactured inUnited States
  • BIMobject CategoryConstruction - Stairs
  • IFC classificationStair
  • Uniclass 1.4 CodeL4322
  • Uniclass 1.4 DescriptionStairs
  • Uniclass 2.0 CodeEE-30-10
  • Uniclass 2.0 DescriptionOn-Ground Stairs
  • Uniclass 2015 CodeEF_35_10
  • Uniclass 2015 DescriptionStairs
  • NBS Reference Code30-10
  • NBS Reference DescriptionOn-Ground Stairs
  • OmniClass Number23-17 23 17
  • CSI UniFormat II CodeC2010
  • CSI UniFormat II TitleStair Construction