Alternating Tread Ladder Details

Aluminum alternating tread stair is an alternative to a traditional ships stair.

Alternating tread ladder details.

As with all precision s products these stairs are built to project conditions and shipped to the job site completely assembled ready for installation. Precision ladders at series of aluminum alternating tread stairs were designed with tubular siderails to provide maximum structural integrity while keeping the overall stair weight to a minimum. Stair slope of either 56 or 68 degrees requires a smaller overall footprint than a standard stair. The unused half tread is removed to provide more tread depth for improved safety and comfort.

I ve done alternating tread stairs before also called ship ladders. Designed to be used as a stair with users facing the direction of travel when climbing up and down. But with an alternating tread stair the difference in height between the right and left treads is the unit rise using the guidelines of commercially built alternating tread stairs i try to get the unit rise between 6 1 2 in. Alternating tread ladder crossover 2 alternating tread ladders connected by a platform industrial stairway calculate space requirements at various heights and angles.

The steeper the angle the larger the rise. The idea behind them is your foot only uses half of the stair so you can cut the other half out to allow more step up room between treads that would otherwise overlap the space savings of a ladder but will full treads and a reasonable rise. Designed with tubular side rails to provide maximum structural integrity while keeping the overall stair weight to a minimum.