General Information

Does Lapeyre Stair have a licensed engineer onsite?

An on-site, licensed engineer is a critical factor in streamlining the design and engineering process for customers. Stairs can be designed and fabricated more rapidly without compromising our quality and accuracy because Lapeyre Stair maintains a licensed engineer on staff.

Does Lapeyre Stair provide engineering stamps?

Lapeyre Stair provides engineering stamps in all 50 states.

Are replacement parts available?

Yes. Contact us to order replacement parts.

Alternating Tread Stairs

Do alternating tread stairs meet code for residential use?

Alternating tread stairs are manufactured for industrial applications. Homeowners interested in alternating tread stairs for residential use should check their local code requirements before ordering.

Do alternating tread stairs meet code for industrial use?

Yes, alternating tread stairs meet the requirements of major industrial building codes. View Our Code Compliance for more information.

Where can alternating tread stairs be used?

Alternating tread stairs can be used anywhere that a steep ladder or stair would be used. Common applications include mezzanines, rooftops, crossover systems, equipment access, and offshore vessels. Alternating tread stairs provide a safe means of forward facing descent. However, it is not possible to turn around and only one foot at a time can fit on a tread. These conditions make alternating tread stairs less suitable for those with mobility issues.

Can an alternating tread stair really be descended facing forward?

Absolutely. It may take a few trips up and down to get the hang of the unique tread as it will feel different. However, users generally adapt to the new system in a short time.

Stair Design Process

Does a sloping floor impact stair design?

When ordering, clients specify the vertical height (H) from the upper finished floor where the top landing will attach (A) to the lower finished floor where the foot of the stair will be secured (B). A sloping floor must be taken into account when taking measurements prior to ordering because it will impact stair design. One way to measure the vertical height at the point where the floor slopes is by using a string level.

What information does the design and engineering department require to reduce RFIs and create an accurate design expediently?
  • Architectural and structural drawings identified as "Ready for Construction"
  • 3D CAD BIM model
  • Addendums or sketches that have been produced since the release of the final construction set
What documents should be included in a basic set of Architectural Drawings?
  • Cover sheet or index drawing
  • Site plan
  • Architectural floor plans
  • Architectural reflected ceiling plans
  • Architectural building sections
  • Architectural wall sections
  • Architectural details
  • Enlarged plans
  • Architectural stair sections and details
What documents should be included in a basic set of Structural Drawings?
  • Foundation plans
  • Framing plans
  • Enlarged framing plans
  • Details
  • Addendums and sketches created after approval of the original design
What information should be included in the floor plan of the stair submitted with the drawing set?
  • Clear, overall dimensions from the inside face of the wall to the inside face of the opposite wall (1)
  • Structural grid lines and designations (Grid A, B, C or 1, 2, 3)
  • Direction of travel (Up or Down arrows)
  • Dimensions of each part of the stair
    • Width of treads (not clear between handrails) (2)
    • Width of clear space between guardrails (3)
    • Depth of landings (4)
  • Number of treads (5)
  • Landing and finished floor elevations (landing and floor heights)
  • Section Marker indicating where a section through the stair can be found (6)
  • Interaction between the handrail and adjacent walls, egress doors, etc. (7)
  • Indications of any special features of the stair and a reference to more information*
    • In this case, a structural column creates a “bump out” at the stair shaft (8)
Ex of Customer Floor Plan
What features should a stair section include?
  • Landing and finished floor elevations (landing and floor heights) (1)
  • Type of tread, type of riser (2)
  • Tread length and riser height (3)
  • Handrail and guardrail heights (4)
  • Handrail type, picket or panel type (5)
  • Handrail extension design (6)
  • Indication of handrail attachment to adjacent walls*
  • References to details explaining connections between the stringers and the landings (7)
  • Relationship between the Lapeyre product and the adjacent wall (8)
  • Depth of landings (9)
  • Stair supports (10)
  • Unusual conditions (11)
    • In this example, the flanges of the structural beam are wider than the wall, resulting in a "bump out" in the wall. In this case, the “bump out” does not affect the stair design. Other projects may have fire risers or other structural or mechanical elements that need to be considered.
Stair Section
Are there other details illustrating conditions specific to a project that are required?

Yes. Dimensions for the centerline of supporting beams to the edge of the slab(s) are vital to the proper design of a stair. Not having this information can lead to interruptions in the design or even the complete redesign of a stair, but it is missing in over 80% of submitted drawings.

In this example, the supporting beam (1) and the edge of the slab (2) are 7 ½" apart (3). These drawings are supplied by a steel fabricator.

Illustration Details

Special Note:The edge of the landing is not the same as the edge of the top nosing. Our stairs require an extra 1.5" from the edge of the slab at the nosing to fit.