Lapeyre Stair, Inc. - The "Alternating Tread" Stair
ATSpecs_R1.doc

SECTION 05512
ALTERNATING TREAD METAL STAIRS

This section is based on products manufactured by Lapeyre Stair, Inc.
5117 Toler Street, Harahan, LA 70123
Telephone: 1-800-535-7631 or 1-504-733-6009
FAX: 1-504 733-4393

The Lapeyre 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.

Specifications include stairs made of aluminum, powder coated carbon steel, galvanized steel, and stainless steel.

SECTION 05 51 33.23 - ALTERNATING TREAD STEEL STAIRS

PART 1 - GENERAL


1.1 RELATED DOCUMENTS:

Drawings and general provisions of Contract, including General and Supplementary Conditions and Division-1 Specification sections, apply to work of this section.

1.2 SUMMARY:

A. Provide all material, labor, equipment and services and perform all operations necessary or required for the work of this section, in accordance with the Drawings and Specifications, and including fabrication and installation of Alternating Tread Steel Stairs.

B. Related work specified elsewhere includes but is not limited to:

1. Conventional Metal Stairs in another Division 5 section
2. Metal Fabrications in another Division 5 section
3. Painting in Division 9

1.3 PERFORMANCE REQUIREMENTS:

A. Stair Treads: shall be capable of withstanding a single concentrated 1000 pound load without permanent deformation; or 100 pounds per square foot or 300 pounds on an area of 4 square inches without exceeding the allowable working stress of the material.

B. Handrail: shall be capable of withstanding a single concentrated load of 200 pounds or a uniform load of 50 pounds per linear foot applied in any direction at any point on the rail without exceeding the allowable working stress of the material.

C. Stair Stringers: shall be capable of withstanding a single concentrated load of 1000 pounds at any point on the stair without permanent deformation; or a uniform live loading of 100 pounds per square foot applied in a downward direction to all tread surfaces or a 300 pound load on an area of 4 square inches without exceeding the allowable working stress of the material.

1.4 CONSTRUCTION REQUIREMENTS:

A. Landings, Treads, and Mounting Base: shall be stamped and formed from single piece material. Stock shapes, hand forming, or welded remnants shall not be permitted. All stamped parts shall have integrally formed rigidizing bends and shall be spot welded to stringers of like material.

B. Welds: shall be a minimum of 8 welds per tread, and 12 welds each on the landing and mounting base. Each weld shall be quality controlled and be capable of withstanding a minimum of 2800 lbs. in shear.

C. Pedestrian Surfaces: shall be punched through with upset non-skid openings.

D. Riser Spacing: shall be equally spaced to within 3/16" for adjacent risers and to within 3/8" for any two non-adjacent risers on a stair.

E. Handrails: shall be contoured for body guidance and underarm support and shall be attached to the outside stringers and landings by bolting.

F. Landing Reinforcement: shall be with 1/4" steel angle notched and punched and factory welded to the landing at the points of a handrail attachment.

G. Rubber Foot Divider: shall be affixed to the central portion of the landing. A rubber bumper strip shall be attached or will be provided for field attaching to the central stringer.

1.5 DIMENSIONS:

A. Stair Angle: [56] or [68] degrees from horizontal as specified in the drawings.

B. Vertical Drop: the change in elevation, as shown in the drawings, between the upper finished floor surface where the top landing will be attached and the lower finished floor surface where the base of the stair will be secured.

1.6 SUBMITTALS:

Dimensional Prints: shall be submitted for approval prior to fabrication.


PART 2- PRODUCTS

2.1 ACCEPTABLE MANUFACTURER:

A. Lapeyre Stair, Inc.
220 Laitram Lane
Harahan, LA. 70123;
1-(800)-535-7631 or
1-(504)-733-6009.

B. Substitutions will not be considered.

2.2 MATERIALS:

A. Carbon Steel:
1. Treads: 13 Gauge 1010/15 HRPO per ASTM A569
2. Landing & Foot Stampings: 11 Gauge 1010/15 per ASTM A569
3. Stringers:
a. 2" x 1 3/4" x 11 Gauge 1010/15 per ASTM A569 for 56 degree stairs under 10 vertical feet and for 68 degree stairs under 12 vertical feet.
b. 3" x 1 3/4" x 11 Gauge 1010/15 for 56 degree stairs over 10 vertical feet and for 68 degree stairs over 12 vertical feet.
4. Handrails: 1 1/2" OD x 0.083" 1010/15 CS per ASTM A569 cold drawn, fully annealed tube per ASTM 513.

B. Stainless Steel:
1. Treads: 13 Gauge 304 SS
2. Landing & Foot Stampings: 11 Gauge 304 SS
3. Stringers:
a. 2" x 1 3/4" x 11 Gauge 304 SS for 56 degree stairs under 10 vertical feet and for 68 degree stairs under 12 vertical feet.
b. 3" x 1 3/4" x 11 Gauge 304 SS 56 degree for stairs over 10 vertical feet and for 68 degree stairs over 12 vertical feet.
4. Handrails: 1 1/2" OD x 0.065" 304 SS cold drawn, fully annealed tube per ASTM A513.

C. Miscellaneous Material:
1. Rubber Spine: Hollow neoprene
2. Rubber Foot Divider: Solid neoprene

2.3 FINISHES:

A. Carbon Steel:
1. Gray Primer: Powder Coat Baked Enamel or
2. Safety Yellow Paint: Powder Coat Baked Enamel or
3. Hot-Dip Galvanized: per ASTM A123

B. Stainless Steel:
Natural finish

2.4 FABRICATION:

General: Fabricate alternating tread steel stairs to conform with performance and construction requirements, and in accordance with approved shop drawings or dimensional prints. Fabricate and shop-assemble to greatest extent possible.

A. Carbon Steel: gas metal arc welded with treads spot welded to stringers and bolt-on handrails with included bolts using the specified materials.

B. Stainless Steel: gas tungsten arc welded and/or gas metal arc welded with treads spot welded to stringers and bolt-on handrails with included bolts using the specified materials.

PART 3- EXECUTION:

3.1 PREPARATIONS:

A. Coordination: Coordinate start and installation of steel alternating treads with all other related and adjacent work. Installation shall not start until the construction has progressed to the point that weather conditions and remaining construction operations will not damage stair installation.

B. Verification: Verify that dimensions and angle are correct and that substrate is in proper condition for stair installation. Do not proceed to install until all necessary corrections have been made.

3.2 INSTALLATION:

A. If bumper has not been installed at the factory, install the bumper in accordance with the manufacturer's instructions using glue supplied with the stair.

B. Prepare mounting holes.

C. Position stair with top tread at same elevation as upper finished floor or roof surface.

D. Secure stair with not less than 2 bolts or studs at top and with not less than 2 at bottom of stair.

E. Touch up with matching paint any chipped or abraded damage to factory finish or

F. Touch up any damage to galvanized surfaces using galvanized repair paint in accordance with ASTM A780.

3.3 CLEAN:
Leave work area clean and free of debris.


SECTION 05 51 33.23- ALTERNATING TREAD ALUMINUM STAIRS



PART 1- GENERAL

1.1 RELATED DOCUMENTS:

Drawings and general provisions of Contract, including General and Supplementary Conditions and Division-1 Specification sections, apply to work of this section.

1.2 SUMMARY:

A. Provide all material, labor, equipment and services and perform all operations necessary or required for the work of this section, in accordance with the Drawings and Specifications, and including fabrication and installation of Alternating Tread Aluminum Stairs.

B. Related work specified elsewhere includes but is not limited to:
1. Conventional Metal Stairs in another Division 5 section
2. Metal Fabrications in another Division 5 section

1.3 PERFORMANCE REQUIREMENTS:

A. Stair Treads: shall be capable of withstanding a single concentrated 1000 pound load without permanent deformation; or 100 pounds per square foot or 300 pounds on an area of 4 square inches without exceeding the design working stress of the material.

B. Handrail: shall be capable of withstanding a single concentrated load of 200 pounds or a uniform load of 50 pounds per linear foot applied in any direction at any point on the rail without exceeding the allowable working stress of the material.

C. Stair Stringers: shall be capable of withstanding a single concentrated load of 1000 pounds at any point on the stair without permanent deformation; or a uniform live loading of 100 pounds per square foot applied in a downward direction to all tread surfaces or a 300 pound load on an area of 4 square inches without exceeding the allowable working stress of the material.

1.4 CONSTRUCTION REQUIREMENTS:

A. Cast Aluminum Treads, Landings, and Mounting Base: shall be shielded metal arc welded to a single extruded box-like stringer.

B. Tread Castings: shall have integrally cast handrail support arms which are precision machined and welded to continuous aluminum handrails.

C. Pedestrian Surfaces: shall be cast with skid resistant surfaces and all treads shall have upturned integrally cast skid barriers.

D. Riser Spacing: shall be equally spaced to within 3/16" for adjacent and to within 3/8" for any two non-adjacent risers on a stair.

E. Handrails: shall be contoured for body guidance and underarm support, and shall have inclined hand side portions for free sliding of the hands unimpeded by the handrail supports.

F. Cast Aluminum Foot Divider: shall be an integral part of the landing and shall form a support for a rubber bumper strip.

1.5 DIMENSIONS:

A. Stair Angle: 68 degrees from horizontal

B. Vertical Drop: the change in elevation, as shown in the drawings, between the upper finished floor surface where the top landing will be attached and the lower finished floor surface where the foot of the stair will be secured.

1.6 SUBMITTALS:

Dimensional prints shall be submitted for approval prior to fabrication.


PART 2-PRODUCTS

2.1 ACCEPTABLE MANUFACTURER:

A. Lapeyre Stair, Inc.
220 Laitram Lane
Harahan, LA. 70123;
1-(800)-535-7631 or
1-(504)-733-6009.

B. Substitutions will not be considered.

2.2 MATERIALS:

A. Landings, Treads and Foot Castings: Aluminum alloy F356F

B. Handrails:
1. Aluminum Alloy 6063-T4
2. 1-1/2" Ф x 1/8" Tube

C. Central Stringer:
1. Aluminum Alloy 6063-T52
2. 1-3/4" x 4" x 1/8" Box Shape

D. Miscellaneous Materials:
1. Rubber Spine: Hollow neoprene strip
2. Bolts: ASTM A307, 1/2" diameter
3. Nuts: ASTM A563

2.3 FINISH:

Natural Finish

2.4 FABRICATION:

A. General: Fabricate alternating tread aluminum stairs to conform with performance and construction requirements, and in accordance with approved shop drawings or dimensional prints. Fabricate and shop-assemble to greatest extent possible.

B. Fabricate gas metal arc welded and/or gas tungsten arc welded alternating tread aluminum stairs using the specified materials.

PART 3- EXECUTION:

3.1 PREPARATIONS:

A. Coordination: Coordinate start and installation of aluminum alternating treads with all other related and adjacent work. Installation shall not start until the construction has progressed to the point that weather conditions and remaining construction operations will not damage stair installation.

B. Verification: Verify that dimensions and angle are correct and that
substrate is in proper condition for stair installation. Do not proceed
to install until all necessary corrections have been made.

3.2 INSTALLATION:

A. Prepare mounting holes.

B. Position stair with top tread at same elevation as upper finished floor or roof surface.

C. Secure stair with not less than 2 bolts or studs at top and with not less than 2 at bottom of stair.

3.3 CLEAN:

Leave work areas clean and free of debris.





SECTION 05 51 36- CROSSOVER AND LANDING PLATFORMS


PART 1- GENERAL

1.1 RELATED DOCUMENTS:

Drawings and general provisions of Contract, including General and Supplementary Conditions and Division-1 Specification sections, apply to work of this section.

1.2 SUMMARY:

A. Provide all material, labor, equipment and services and perform all operations necessary or required for the work of this section, in accordance with the Drawings and Specifications, and including fabrication and installation of crossover and landing platforms.

B. Related work specified elsewhere includes but is not limited to:

1. Section 05 51 33.23- Alternating Tread Steel Stairs
2. Section 05 51 33.23- Alternating Tread Aluminum Stairs
3. Conventional Metal Stairs in another Division 5 section
4. Metal Fabrications in another Division 5 section
5. Painting in Division 9

1.3 PERFORMANCE REQUIREMENTS:

A. Stair Treads: shall be capable of withstanding a single concentrated 1000 pound load without permanent deformation; or 100 pounds per square foot or 300 pounds on an area of 4 square inches without exceeding the design working stress of the material.

B. Handrail: shall be capable of withstanding a single concentrated load of 200 pounds or a uniform load of 50 pounds per linear foot applied in any direction at any point on the rail without exceeding the allowable working stress of the material.

C. Stair Stringers: shall be capable of withstanding a single concentrated load of 1000 pounds at any point on the stair without permanent deformation; or a uniform live loading of 100 pounds per square foot applied in a downward direction to all tread surfaces or a 300 pound load on an area of 4 square inches without exceeding the allowable working stress of the material.

1.4 CONSTRUCTION REQUIREMENTS:

A. Diamond Plate Trays: shall be single part units cut, formed, and punched using break and shearing equipment.

B. Mounting Brackets and Kickplates: shall be either formed or welded onto the trays.

C. Handrails: shall be attached to trays by bolting.


1.5 DIMENSIONS:

A. Platform: as specified in the drawings but in no case with a width less than the width of the connecting stair and with a length of at least 30" in the direction of travel.

B. Handrails: 42" nominal vertical height from upper surface of top rail to top surface of crossover or landing platform.

C. Toe Plate: 4" nominal vertical height from its top edge to top surface of crossover or landing platform.

1.6 SUBMITTALS:

Dimensional Prints: shall be submitted for approval prior to fabrication.


PART 2- PRODUCTS

2.1 ACCEPTABLE MANUFACTURER:

Lapeyre Stair, Inc.
220 Laitram Lane
Harahan, LA. 70123;
1-(800)-535-7631 or
1-(504)-733-6009.

2.2 MATERIALS:

A. Carbon Steel:

1. Platform: 1010/15 CS, 3/16" diamond safety plate
2. Handrails: 1-1/2" OD x 0.083" 1010/15 CS per ASTM A1011 cold drawn, fully annealed tube per ASTM 513.

B. Stainless Steel:

1. Platform: 304 SS, 3/16" diamond safety plate
2. Handrails: 1-1/2" OD x 0.065" 304 SS cold drawn, fully annealed tube per ASTM 513.

C. Aluminum:

1. Platform: Aluminum alloy F356F, 3/16" diamond safety plate
2. Handrails: 1-1/2" x 1/8" tube aluminum alloy 6063-T4

D. Miscellaneous Material:

Handrail clamps: Cast aluminum

2.3 FINISHES:

A. Carbon Steel:

1. Gray Primer: Powder Coat Baked Enamel or
2. Safety Yellow Paint: Powder Coat Baked Enamel or
3. Hot-Dip Galvanized: per ASTM A123

B. Stainless Steel:

Natural finish

C. Aluminum:

Natural finish

2.4 FABRICATION:

General: Fabricate crossover or landing platforms to conform with dimensions, performance, and construction requirements, and in accordance with approved shop drawings or dimensional prints.

A. Carbon Steel: cut, formed, and punched crossover or landing platforms with mounting brackets and kickplates possibly gas metal arc welded with bolt-on handrails using the specified materials.

B. Stainless Steel: cut, formed, and punched crossover or landing platforms with mounting brackets and kickplates possibly gas tungsten arc welded and/or gas metal arc welded with bolt-on handrails using the specified materials.

C. Aluminum: cut, formed, and punched crossover or landing platforms with mounting brackets and kickplates possibly gas tungsten arc welded and/or gas metal arc welded with bolt-on handrails using the specified materials.

PART 3- EXECUTION:

3.1 PREPARATIONS:

A. Coordination: Coordinate start and installation of crossover or landing platforms with all other related and adjacent work. Installation shall not start until the construction has progressed to the point that weather conditions and remaining construction operations will not damage platform installation.

B. Verification: Verify that dimensions are correct and that substrate is in proper condition for platform installation. Do not proceed to install until all necessary corrections have been made.

3.2 INSTALLATION:

*** CUSTOMER SUPPLIED BRACING/SUPPORT IS REQUIRED FOR ALL PLATFORMS.

A. Install crossover or landing platform with stair, securing with 2 bolts and handrail clamps.

B. Touch up with matching paint any chipped or abraded damage to factory finish or

C. Touch up any damage to galvanized surfaces using galvanized repair paint in accordance with ASTM A780.

3.3 CLEAN:

Leave work area clean and free of debris.

_RSB 12-9-2005