Most alternating tread ladder stairs have the same number of treads on each side which isn t absolutely necessary and i suspect it s based more on aesthetics than on construction or comfort.
Alternating tread device vs ships ladder.
Available in steel.
But for the purposes of this answer let s assume that the stair does have the same number of treads on both sides.
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The riser height is reduced and the run is longer than a typical ship ladder but the steps alternate.
Aluminum ship ladder with platform.
Precision s aluminum alternating tread stair is an alternative to a traditional ships stair.
Alternating tread ladders available in a variety of sizes.
Aluminum crossover ships ladder footprint 2 ships ladders connected by a platform alternating tread ladder calculate space requirements at various heights and angles.
Easy assembly and quick ship available.
The angle of the ladder is usually 60 70 and the design should use the shallowest angle possible within this range.
These stairs allow the user to descend face forward giving a clear view of the floor below.
Let s look at how osha defines stairways alternating tread stairs ship stairs ship ladders and fixed ladders to understand the difference.
The width of ship ladders is usually 24 and the tread depth is 6.
How do these devices differ from each other.
This is an alternating tread stair.
This stair saves space and you can go down face forward.
The dimensions of ship ladders vary based on available space so they are always custom fabricated.
Since the treads alternate this stair is not considered to be as safe as a standard ship ladder or spiral stair.
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All alternating tread ladders have a 350 pound capacity.
Alternating tread ladder with platform.
Alternating tread ladder crossover 2 alternating tread ladders connected by a platform industrial.
Ships ladders ship stairs ship ladder stairs alternating tread stairs fixed ladders are all terms that can get confused and sometimes used interchangeably.