Spiral Stairs

Modern Italian Design

Spiral Stairs - Modern Italian Design

How do you install a stair case in a home

1. Check floors, top and bottom to determine finish floor thickness. Refer to stair plan /specifications to make sure these match.
2. Check bottom step to assure that finish floor will be marked on the bottom riser. Remove landing tread /nosing at top of stair. Volute or turnout newel should be glued and bolted prior to positioning of stair. Use post carton over post for protection.
3. Position stair in well considering wall finish thickness. If stair has intermediate landing, properly align stair sections. Check for level and scribe or shim bottom step accordingly. Do not shim landing tread above finish floor. Mark and cut stringers as required to match trim.
4. Shim any void and fasten stringers to framing at top of stair first. Screws should be used. NOTE: Stair width has been made to allow for wall finish however some variation in shim thickness may be necessary dependent upon framing tolerances.
5. Shim any void and fasten top riser to header. Fasteners can be concealed by cove moulding.
6. For partial open stairs, check for level at junction of box and open stringers. Some sag in this area is normal due to shipping and handling. Correct this with prop prior to fastening.
7. For full open stairs, check open side of stair by sighting bottom of stinger. Prop middle as required prior to fastening. NOTE: A slight (1/8” – 3/16”) crown above straight is desirable.
8. Place glue cleat behind bottom riser and fasten to floor. Fasten bottom riser to glue cleat. Fasteners can be concealed by finish floor.
9. Shim any void and fasten stingers to studs above and below treads. Box stringer fasteners can be concealed under stair. Screws should be used.
10. NOTE: Install any posts prior to landing tread installation. Install landing tread with glue and fasteners. Box landing tread installations will require trimming length by approximately 3/8”. Insert into one side, push down, and slide over into routing in opposite side.
11. Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height.
12. The minimum headroom in all parts of the stairway shall not be less than 6 feet, 8 inches (2036 mm) measured vertically from the sloped plane adjoining the tread nosing.
13. The maximum riser height shall be 73⁄4 inches (196 mm). The riser shall be measured vertically between leading edges of the adjacent treads.
14. The minimum tread depth shall be 10 inches (254 mm). The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’s leading edge.
15. The radius of curvature at the leading edge of the tread shall be no greater than 9/16 inch (14.3 mm).
16. There shall be a floor or landing at the top and bottom of each stairway.
Exception: A floor or landing is not required atthe top of an interior flight of stairs, including stairs in an enclosed garage, provided a door does not swing over the stairs.
A flight of stairs shall not have a vertical rise greater than 12 feet (3658 mm) between floor levels or landings. The width of each landing shall not be less than the stairway served. Every landing shall have a minimum dimension of 36 inches (914 mm) measured in the direction of travel.
17. The walking surface of treads and landings of stairways shall be sloped no steeper than one unit vertical in 48 inches horizontal (2-percent slope).
18. Handrails shall be provided on at least one side of each continuous run of treads or flight with four or more risers.
19. Handrail height, measured vertically from the sloped plane adjoining the tread nosing, or finish surface of ramp slope, shall be not less than 34 inches (864 mm) and not more than 38 inches (965 mm).
20. Handrails for stairways shall be continuous for the full length of the flight, from a point directly above the top riser of the flight to a point directly above lowest riser of the flight.
21. Spiral stairways are permitted, provided the minimum width shall be 26 inches (660 mm) with each tread having a 71⁄2 inch (190 mm) minimum tread depth at 12 inches from the narrower edge. All treads shall be identical, and the rise shall be no more than 91⁄2 inches (241 mm). A minimum headroom of 6 feet, 6 inches (1982 mm) shall be provided.
22. Porches, balconies, ramps or raised floor surfaces located more than 30 inches (762 mm) above the floor or grade below shall have guards not less than 36 inches (914 mm) in height. Open sides of stairs with a total rise of more than 30 inches (762 mm) above the floor or grade below shall have guards not less than 34 inches (864 mm) in height measured vertically from the nosing of the treads.