Log Spiral Stairway

Log Spiral Staircase

The Armstrong Creek Company is proud to introduce our newest product line, the log spiral staircase. Each staircase is designed and manufactured with CNC and CAD technology from the information you provide. The entire planning process you will need for your stairway is listed below as a pdf for you to print and use as a guide.

The staircase components are kiln dried and comprise of a 10" diameter hand hewn center log post moritsed for the treads. The treads are 16" diameter peeled pine half logs with tenoned ends to fit into the center log post. The treads are numbered for ease of assembly. All lag screws and wood plugs are provided to secure the treads to the center log post.

The hand railing are kiln dried pine and laminated the full length to fit the radius of the stairway. Depending on the shipping method, it may be necessary to cut the railing and splice the two pieces at the center post. The hand railing is drilled to fit the spindle tenons

Opening for Staircase

Well Opening (Figure 1)

The width (dimension X) must be at least the length of the tread plus 3". the overall width (dimension Y) will depend on the particular stairway specs. It may not need to be the diameter of the stairway. The length (dimension Z) will be dependent on the extension of the upper floor. There must be at least 78" of head room from the front edge of the tread and the upper floor joist. Ideally, well openings would accommodate the whole diameter of the staircase in one direction or the other.

Figure 1
Well opening for log spiral stairway

Open Loft (Figure 2)

If a landing is installed at the top of the stairs, there will be more options available in regards to required verticle clearances. Railings for the stairway will be 3" thick. Table 1 (below) shows dimension options based on tread width. The minimum angle of rotation to pass building code for exposed tread surface: 12" from the narrowest part of the tread. Any tread width and individual rise combination can be considered if code requirements do not have to be met. All tread material is cut from 16" diameter half logs.

Figure 2
Open Loft Diagram
3d Diagram of Log Spiral Stairway
Dimensional requirement table for log spiral stairway