By Bob in New Florence, PA on 10/13/2007
Actually most of the bigger places for spiral stairs are very good about codes and they follow them down to the smallest detail. Here is an example of one of them and this is what we showed to our inspector and he said that it is fine, In our area as long as the specs are good and you have a copy of the schematics the inspector is decent to work with.
Building Code Specifications
Salter’s Code Stair Packages will address each of the requirements that are listed below. This information will apply to the BOCA Code, UBC Code, the CABO Code and the IRC 2003, IRC 2006, and IFC 2006 codes.
1. Minimum clear walking path 26", 5 ft. diameter or larger.
2. Tread will have a minimum of 7 1/2", 12" out from the narrow edge of the tread.
3. Minimum headroom of 6' 6", measuring plumb from the edge of the platform down to the tread below.
4. The rise will not be more than 9 1/2".
5. The stairway shall be equipped with one handrail on the wide edge of the tread.
6. The handrail, in individual dwelling units, not less than 34" and not more than 38", measured vertically above the nosing of the tread and landing. ( BOCA is 30" up to 38" )
7. Balusters shall be spaced so a 4" object cannot pass between the balusters.
8. Balcony railings will be 36" or above.
9. Landing width ( that Salter supplies ) shall not be less than the required width of the stairway. Minimum spiral stair tread width is 26".
10. 1 1/2" OD. Aluminum, Brass or 1 3/4" wide x 2" tall oak handrail.
11. A 300 lb. concentrated load is required. All Salter stairs are calculated to carry 600 lbs. or more concentrated load.
Please have your inspector review the specifications before placing your order.
Inspector Signature ____________________ Date________________
Salter's standard code package will not address the open space between each tread ( open rise stair ). If your code, IRC 2003, IRC 2006 or IFC 2006, requires not more than a 4" space in this area, you will need to order our code risers.
Verify what handrail size and shape your inspector will require. Handrail size and shape is becoming a very controversial area within the building code. We recommend that you use our standard 1 1/2" round rails or our 1 3/4" x 2" wood rails for the proper circumference.