Stair Landing Stair

Applications where the floor-to-floor level is above 12’-0” height, building codes require that a single stair have a mid-level landing within the stair run. The S-L-S (or Stair-Landing-Stair) design is actually three pieces cast as one pour (two stairs with an integral mid-level landing). The S-L-S stair requires support at the head and foot. The S-L-S design offers quick erection and access and helps to reduce the number of bearing locations thereby reducing the cost of the framing package to the customer.

Half Z

This design is a modification of the Open Zee stair. There is only one integral landing (whether a head or a foot) typically at the intermediate level. It is common to have 3 pieces per level (per tower) to erect in this version. Each stair has an integral landing portion that is connected together to create a full landing. In most cases, it’s the floor landing that is a separate slab (hence, 3 pieces to erect per level). In this version, the integral landing bears on the end wall.

J-Shaped Stairs

The J-Shaped design is similar to the L-Shaped stair and offers a full width integral landing. This stair style has a return on one end of the full with landing which is used as a structural pad for the next ascending stair. The integral landing edge of the J-Shaped stair requires “end wall” or “side wall” support.

L-Shaped Stairs

L-Shaped Stairs (named by how they look in “plan” view) are common in precast structures and include a full width integral landing on one end (either the head or the foot) of a stair. This stair style is often preferred if the owner or designer wants to avoid a joint down the middle of the landings. Fully incorporated, the L-Shaped stair design uses only two units per level. The ascending stair jumping off the landing uses a welded connection at the foot.

Open Zee

Open Zee is a common design in precast structures such as parking garages. This stair style features integral landings on both the head and the foot; this means there are only two pieces to erect per level, per tower. Stairs range from 8”-12” thickness and require “end wall” support. The Open Zee design is ideal for blast-resistant applications and design situations that require stairs with low deflection (i.e. cantilevered landings or curtain wall attachment).

Punch Through (or Drop Through)

The Punch-Through design is commonly used in precast structures and features a single run unit that sits in a void in the floor area (between the stems)of a double tee flooring system. Punch-Through Stairs are supported by tube steel anchored into the double tee. This stair tower system is often an economical choice for one or more towers in your precast structure.

Separate Stair and Landing

The stairs in this design are often referred to as “stretchers” and contain the riser / tread run. The landings include the intermediate as well as the floor level. This design requires “side wall” support of the landings. The stairs span from landing to landing. There are four pieces per level/per tower to erect when using this design.

(X) Stairs and Single Run

Unlike the S-L-S design, the single run stair design is for applications up to 12’-0” floor-to-floor elevation. The (X) stair design is an economical alternative because two stairwells can occupy one shaft, separated by a fire wall. We see this design most commonly in cities where the real estate is mostly “vertical”. As noted above, the single run stair can be erected very quickly (often 1/2-hour or less for each stair), creating immediate access to the floor levels for all trades. The landing slabs are designed separate from the stairs. These stairs can be designed with a ledge on the inner edge to carry the firewall (reducing cost to the customer).

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