Spiral

Circular

Monumental

Dimensions & Specifications

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Dimensions & Specifications

     

Notes:
1. Dimensions:
Spiral stairs are manufactured in a variety of diameters. Larger diameters increase perceived comfort, ease of use, and safety.
2. Tread and platform materials:
The most common materials aree steel aluminum, and wood. Steel and alumninm can be smooth plate, pan type, and bar. A variety of hardwoods can be used although many manufacturers used steel substructure to support the finished wood surface. Plywood usually is used under carpeting.
3. Coatings:
Standard for interior locations is red oxide primer or black enamel. Standard for exteriior and wet area interior locations is hot dipped galvanized or zinc-chromatic rust inhibitor primer. Other coatings are available via special order.
4. Handrails and balusters:
A large variety of materials are available, including steel, aluminum, brass, bronze, wood, glass and plastic laminate.
5.
Platform Dimensions are norrmally 2 inches larger than the stair radius. Various anchorage connections are avaiilable to suit the floor structure.
6.
Clear opening for stair must be a minumum of 4" larger than the stair diameter for handrail clearance.
7.
All spiral stairs are available wiht a landing or you may frame your own.   
8. 
All illustrations show our landings with handrails. When you frame your own landing, a level handrail is not normally provided buy is available as an option. 
9. 
We also manufacture custom handrails, ladders, landings, and fences as well as other stair types to meet your project requrirements. 
10.
Please refer to local and national codes for dimensional and construction requirements for your intended usage.

TO DETERMINE THE TOTAL ROTATION OF YOUR STAIR:
Divide your floor to floor height (FF) by the number of risers (N) to determine the riser height (H). Riser height should be between 7.5" for code compliance. The number of treads is one less than the number of risers. Multiply the number of treads by the chosen tread angle (see chart below for standard treads) to determine the total stair rotation.

Given:        
Floor to Floor Height (FF): 102"   Riser Height:
(FF/N) = (102/12) = 8.5"
Number of Risers (N): 12   # of Treads:
N - 1 = 11 Treads
Chosen Tread Angle(0): 27'   Total Stair Rotaion:
# of Treads x 0 = 297'

Framing Dimensions (Inches)

Model # DIA A B C
48S 48 24 28 52
52S 52 26 30 56
60S 60 30 34 64
64S 64 32 36 68
72S 72 36 40 76
76S 76 38 42 70
88S 88 42-11/16 49-5/16 92
96S 96 46-11/16 53-5/16 100

Completely Welded Unit - Not a Kit
Any Height or Width

30 Years of Stairbuilding Experience
Recommended Finish:
Zinc-Chromate Prime-Field Finish

Check List for Stair Design

Diameter of stairs: ______ in.
Floor to Floor Height: ______Ft. ______ In.
Direction of rotation going up: [ ] CW [ ] CCW
Type of Treads desired: [ ] Smooth Plate [ ] Checkered Plate
[ ] Wood Overlay [ ] Bar Grating
Do codes require more than one baluster per tread? [ ] Yes [ ] No
Maximum allowed baluster spacing ? ______ In.
Will need a [ ] Top Platform? [ ] Intermediate Platform? [ ] Hidden base plate?
Plating: [ ] Black Enamel [ ] Red Oxide Primer [ ] Hot Dipped Galvanized [ ] Zinc Chromate [ ] Other

Specifications
Model # 48S 52S 60S 64S 72S 76S 88S 96S
Diameter 48" 52" 60" 64" 72" 76" 88" 96"
Center Column 4" 4" 4" 4" 4" 4" 6-5/8" 6-5/8"
Lbs. per 9 ft. 220 235 250 265 310 325 435 485
Tread Detail #A 4" 4" 4" 4" 4" 4" 6-5/8" 6-5/8"
Tread Detail #B 22" 24" 28" 30" 34" 36" 42" 48"
27 Degrees Tread Detail #C 11-1/2" 12-1/8" 13-13/16" 14-7/8" 16-3/4" 17-5/8" 20-1/2" 22-5/16"
27 Degrees Tread Detail #D 8" 8-1/4" 8-5/8" 8-1/2" 8-5/8" 8-3/4" 10" 10-1/2"
30 Degrees Tread Detail #C 12-3/16" 13-5/8" 15-3/4" 16-3/4" 18-7/8" 19-7/8" 23" 25-1/8"
30 Degrees Tread Detail #D 8-3/8" 8-3/4" 8-7/8" 9" 9-1/4" 9-3/8" 11-3/8" 11-1/2"
Platform Size 26" 28" 32" 34" 38" 40" 46" 52"

Design Loads:
Our standard stairs are designed for 100 psf, 300 lb. point loads and a 200 lb. railing load. These loads meet most code requirements but it is the users responsibility to inform manufacturer of the specific code requirements for your installation. Custom designs for special requirements are available.

Tread Detail

 
 

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6 East 3rd Street, Kenner, LA 70062
Phone: 800-842-8158