Exceptions: 1. This instruction recognized a newly developed alternating treat type stair not presently covered by existing OSHA standards. Specifications. Follow. Alternating-tread ladder stairs have three carriages, so I use the first carriage as a template to cut the bottom angle on the other two carriages. The theory is that, since you only step on any tread with one foot, you only need every other tread in succession, zig-zag-style, which allows construction of a steeper stair in a tight space. Meets OSHA Code 29CFR 1910.25(e). Stair riser heights and stair tread depths should be within the parameters of the code to avoid any potential trip hazards for inconsistencies. Recent editions of the International Building Code (which many states have adopted) limit alternating tread stairs in the following ways: 1009.10 Vertical rise. The following drawings are included: the working triangle; stringer detail and tread detail. … F. Background. Inconsistencies or variations in risers or treads could interfere with the rhythm of the individual using the stairs. 3. 3. 3. Stay safe and healthy. Scope. Alternating Tread Stairs Feature Alternating Steps To Offer A Shorter Span Than Traditional Step Ladders Portable stairs are made with welded steel for strength. Lapeyre Stair. Compatible with alternating tread stairs and industrial bolted access stairs. Alternating tread stairs include handrails and dual safety chains to provide operator safety.

Dismiss Visit. Lapeyre Stair. Alternating Tread Stairs engineered manufactured by Brazos Manufacturing of Whitney, TX (Dallas Ft Worth Area) This type of staircase allows a …

Purpose. Exceptions: 1. 1910.25(b)(9) When paragraph (b)(8) of this section allows the use of spiral, ship, or alternating tread-type stairs, they are installed, used, and maintained in accordance with manufacturer's instructions. Stair tread depths shall be 11 inches (279 mm) minimum. Recent editions of the International Building Code (which many states have adopted) limit alternating tread stairs in the following ways: 1009.10 Vertical rise. Formed steel steps have raised surfaces for improved traction. The stair shall be equipped with a handrail on each side to assist the user in climbing or descending the stair. 1.2 ADDITIONAL WORK INCLUDED IN THIS SECTION Some items of work are usually specified in sections other than 05 51 33.23. Alternating tread step designs offers a shorter span than traditional steps.

B. F. Background. The riser height shall be measured vertically between the leading edges of adjacent treads. The International Building Code (IBC) and NFPA-101 (Life Safety Code) use the term alternating tread device.) Assume you're referring to a so-called "ergonomic stair," with staggered treads. Alternating tread devices shall have a minimum tread depth of 5 inches (127 mm), a minimum projected tread depth of 8 1 / 2 inches (216 mm), a minimum tread width of 7 inches (178 mm) and a maximum riser height of 9 1 / 2 inches (241 mm). For one thing, they don't meet a lot of building codes.

We love alternating tread stairs because they are such great space savers; this photo shows the comparison. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 0.375 inch (9.5 mm). F. Background. Please practice hand-washing and social distancing, and check out our resources for adapting to these times. This instruction applies OSHA-wide. By the way, I consider every run of stairs greater than 45° and less than 75° to be a ladder stair. Ideal for crossovers, equipment access, intermediate landings and exit landings.

The Directorate of Safety Standards Programs will propose standards for the alternating tread type stair when the Subpart D Proposal is published in the Federal Register.

Single piece of formed metal creates the walking surface, kick plates, and stair mounting plates. The stair shall be equipped with a handrail on each side to assist the user in climbing or descending the stair. The Alternating Tread Type Stair • Information Date: 04/26/1982 • Standard Number: 1910.24: OSHA Instruction STD 1-1.11 APR 26, 1982 Office of Compliance Programming Subject: The alternating Tread Type Stair A. 2. A flight of stairs shall not have a vertical rise greater than 12 feet (3658 mm) between floor levels or landings. The Directorate of Safety Standards Programs will propose standards for the alternating tread type stair when the Subpart D Proposal is … The Directorate of Safety Standards Programs will propose standards for the alternating tread type stair when the Subpart D Proposal is published in the Federal Register. 1.2 ADDITIONAL WORK INCLUDED IN THIS SECTION Some items of work are usually specified in sections other than 05 51 33.23. Lapeyre Stair | Lapeyre Stair offers an innovative, expanding product line of stairs and platform components engineered to meet your assembly requirements. The stair shall be equipped with a handrail on each side to assist the user in climbing or descending the stair. Spiral, ship, or alternating tread-type stairs are used only when the employer can demonstrate that it is not feasible to provide standard stairs. They aren’t exactly common in the United States, probably due to the fact that they don’t meet the strict code requirements that most municipalities impose on stair construction.
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