Stair Nomenclature

Headroom (N.L.T. 80" or 6'8") Standard
Headroom (N.L.T. 90" or 7'6") OPT.
Height of Flight (Landing to Landing)
®
Landing
Extension
Landing Min. 44"
or width of Stair
15 Risers Max Per Run
N.M.T. 144" inches
15 Risers Max Per Run
N.M.T. 144" inches
Head
12" Min.
18" OPT.
Length of Run
ACCURATE BUILDING INSPECTORS
Division of Ubell Enterprises, Inc.
Length of Flight
Ceiling
Tread (N.L.T. - 10" Depth)
Nosing (N.M.T. - 1 1/2" Width)
®
Riser N.M.T. - 8 1/4"
4" Min. - 7 1/2" OPT.
(N.L.T. - 44")
or width of Stair
Platform
- Tread platform & landing surfaces shall be of a non-slip material.
- No run of steps shall be less than 3 risers.
- All steps shall be uniform from foot to head in every flight.
From: "Watch Your Step & Hold On"
Stair Nomenclature
(Informational Only. Check Local Codes & Standards.)
Headroom*
Headroom**
www.AccurateBuilding.com
1-800-640-8285
Handrail Height
Between 30"- 34"
Handrail Placement
Handrail(s) should be setup:
1. Continuous along both sides of stairs.
2. Parallel with the rake of the stairs.
3. Have at least one handrail.
4. Stair over 44" wide should have a
handrail on both sides.
5. Stairs over 88" Wide should have
handrails on both sides plus an
intermediate handrail(s).
6. Finger clearance 1 1/2 " continuous.
7. Handrail shall not exceed 2" Diam.
Landing
Extension
12" Min.
18" OPT.
Landing Min. 44"
or width of Stair
Foot
Legend
OPT = Optimum
N.L.T. = Not Less Than
N.M.T = Not More Than
NOTE: May vary in
certain types of structures.
ie. Residential, Commercial,
Places of Assembly,
Medical Facilities etc.
** Headroom (N.L.T. 80" or 6'8") Standard
* Headroom (N.L.T. 90" or 7'6") OPT.
Copyright C 2005