Our stairs are typically built with a 7:11 pitch to meet code. This is the maximum IBC code mandated pitch.
The minimum width between the closest handrail and guardrail per IBC codes is 36”, though most stairs are built 4′ wide for comfort.
Our stairs are lightweight and fast to setup. In the gallery there is a photo of a 6’ wide, 12’ high staircase. Two of these were installed by 5 carpenters in 13 minutes. No forklift required.
There is a proprietary connection between the upper and lower stair sections. Once the upper stair section is hooked onto the slots in the supporting beam, with the lower end sitting on the adjustable legs, the lower stair section is slid into place and the downward-facing tenon on the lower stair section slides into the upward-facing mortice in the upper stair. The weight of the stair and occupants holds the 2 sections together.
The adjustable feet on the legs are used to adjust the 2 sections so the stringers are straight.
We build open and closed tread stairs. The risers can be removable
Stringers are powder coated plate aluminum unless the design calls for a center stringer and floating treads.
Common tread and riser materials are plywood, finished hardwood and powder coated aluminum. Unfinished birch plywood is often used on stairs that are going to be carpeted and the area below enclosed.
We normally build landings as lightweight aluminum structures that require no assembly on site saving setup time and drayage.
We build curved aluminum staircases with wooden or aluminum treads. The minimum inside radius is twice the minimum width of the stairs and the minimum depth of the treads is 11” measured 12” in from the inside radius. They are always built in 2 halves to make setup easy, and minimize truck space.
Steel threaded inserts in the aluminum stringers provide durable attachment points for the guardrail/handrail.
Code requires that the guardrails be at least 42” above the nose of the stair treads with an additional safety handrail at 34-38”.
There are several standard methods of shipping the staircase halves and stair guardrail together. There are examples in the shipping section.
Slotted holes in the supporting beam allow the setup crew to fine tune the lateral location of the staircase.
We can supply lightweight stair enclosures.
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