Handrail systems, treads, risers, and the code words that come with them. Built for anyone framing, trimming or inspecting a staircase.
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Jump to a term: Baluster · Baluster Shoe · Balustrade · Bread Loaf / Finger Groove (Rail Profiles) · Cap Rail / Wall Cap · Code Terms: Rail Height, Graspability, 4in Sphere Rule · False Tread · Guard (Guardrail) · Handrail · Headroom · Horizontal Bar Railing · Landing / Landing Tread · Newel Post · Nosing / Return Nosing · Over-the-Post vs. Post-to-Post · Pitch / Pitch Line · Rail Bolt · Rake · Rise (Stairs) · Riser · Run (Stairs) · Skirt boards (Stairs) · Spindle Count (Code) · Stair End Cap (Open Side / Inside Side) · Stringer (Cut / Housed) · Tread · Volute / Turnout · Wall Rail / Rail Bracket
Baluster
Also called: spindle, picket.
One of the vertical pieces that fills the run of a stair railing between the newel posts, spaced close enough that nothing can fall through.
Pro note: Spacing is a hard code number, not a style call. The commonly used number is 4in max, but confirm the exact figure with your local inspector, since amendments vary city to city. Metal balusters get set into the tread and epoxied all at once; they go in after paint, taped off by painters.
Baluster is the correct all-purpose term; spindle implies a turned/lathed profile; picket implies a squared, fence-derived look.
Baluster Shoe
Also called: metal baluster shoe, rail shoe.
The small metal or decorative cap/base where a metal baluster meets the tread, covering the drilled hole and epoxy-set along with the baluster.
Pro note: Set and epoxy all balusters and their shoes at once for a strong, consistent bond.
Do not confuse this with a base shoe, the strip of molding at the bottom of a baseboard. Both are called 'shoe' on site, but they are different parts.
Balustrade
The umbrella term for the whole baluster, rail and newel assembly together.
Bread Loaf / Finger Groove (Rail Profiles)
Two rail-profile fixes for a square handrail that fails a local graspability check: a rounded 'bread loaf' profile, or a finger groove cut into a square profile.
Cap Rail / Wall Cap
Also called: knee wall cap, half-wall cap, stair cap.
A cap that finishes the top of a half-wall or pony wall along a stair, distinct from a wall-mounted handrail.
Do not confuse this with a wall rail. A wall rail is the graspable handrail mounted to a wall; a cap rail finishes the top of a half-wall and is not meant to be gripped for support.
Code Terms: Rail Height, Graspability, 4in Sphere Rule
Handrail height must fall between 34in and 38in, measured from the nosing. Graspability means a hand can wrap around the profile. The 4in sphere rule means no opening in a guard or railing system can be big enough to pass a 4in sphere through it.
False Tread
A decorative applied tread nosing with no structural function.
Guard (Guardrail)
Also called: guardrail, guard rail.
The barrier that stops a fall from a raised walking surface. Unlike a handrail, you are not meant to grip it for support; its job is to be a wall you cannot fall through or over.
Pro note: A guard is required at a meaningful drop; a handrail is required at stairs with enough risers. Many assemblies need both.
Guard = the BARRIER that stops a fall. Handrail = what you GRIP for support. A stair can require both at once.
Handrail
Also called: rail.
The rail you grip with your hand for support going up or down stairs. Must be graspable and mounted at a reachable height.
Pro note: Handrail and guard are two different code elements the trade constantly mixes up. A handrail is what you hold.
Handrail = what you GRIP. Guard = the BARRIER that stops a fall. A stair can require both at once.
Headroom
The vertical clearance above a stair flight, measured off the nosing line. The commonly cited minimum is 6ft-8in, but confirm the exact number with your local inspector, since code amendments vary city to city.
Horizontal Bar Railing
Also called: pipe railing, horizontal pipe railing.
A guard/rail system built from horizontal metal bar or pipe stock instead of vertical balusters.
Landing / Landing Tread
A flat platform between stair flights or at top/bottom; landing tread is the trim/flooring detail where the top step meets the landing floor.
Newel Post
Also called: newel, box newel, turned newel.
The large post that anchors a stair handrail system at the bottom, top, and at each turn or landing. Carries the structural load of the railing.
Pro note: Anchoring solid to the framing is the whole job. Use lag bolts or a manufacturer anchor kit into real framing, never just the subfloor.
Not simply 'a post.' A generic 'post' in framing/deck talk means any vertical structural member.
Nosing / Return Nosing
Nosing is the front overhang of a tread past the riser below it; return nosing wraps the nosing profile around an open, unsupported end of a tread.
Over-the-Post vs. Post-to-Post
These are two different handrail-to-newel systems. Post-to-post terminates the rail into the face of the newel. Over-the-post passes the rail continuously over the top of the post, which needs different fittings and rail bolts.
Pitch / Pitch Line
The slope angle a stair follows; a wall-mount handrail must track the stair's pitch line.
Rail Bolt
A threaded connector (bolt, star nut, cover plug) used to join rail sections invisibly, mainly in over-the-post systems.
Rake
The sloped angle of a stair run, used when cutting handrail sections that follow the stair incline rather than running level.
Rise (Stairs)
The vertical height measurement of a single step or a full flight of stairs.
A wall's height change (framing talk, e.g. a stepped foundation or dropped ceiling) is a different, unrelated sense of 'rise.' This entry is the stairs/code measurement only.
Riser
Also called: riser board.
The vertical board that closes the gap between one tread and the next. An open riser stair has none; a closed riser stair has one on every step.
Pro note: Blocking behind a riser must sit flush with or behind the riser cut face, never proud of it, or the riser will not sit flat.
Run (Stairs)
The horizontal depth measurement of a single stair tread or a full flight.
This is the stairs and code sense of run. Crews also use 'run' loosely for a length of baseboard or crown. The word also has separate wiring and plumbing meanings that do not apply here.
Skirt boards (Stairs)
Also called: skirtboard, stair skirt, stringboard, skirt board.
The trim board that runs up the wall alongside a staircase, following the slope of the stairs, covering the joint where the stair meets the drywall.
Pro note: Key step is scribing/notching the board to the treads and risers so it drops in tight. A shoe piece often runs along the bottom edge where it meets the tread.
Distinct from a stringer, the structural member that actually carries the load, even though jobsite talk swaps the two words constantly. A skirt board is finish trim only, with no structural role.
Spindle Count (Code)
The code-driven minimum number of baluster spindles per tread run: 3 for standard stairs, 2 for curved stairs.
Stair End Cap (Open Side / Inside Side)
A finish cap that closes off the exposed end of a tread, either on the open side of a stair or the inside corner side.
Stringer (Cut / Housed)
Also called: string, carriage.
The structural side member of a staircase that the treads and risers attach to. Cut stringers are notched to the profile (open stairs); housed stringers have routed dadoes the ends slot into (closed, finished stairs).
Often used loosely on site for skirt boards, but they are not the same thing. A stringer is structural and carries the load; a skirt board is finish trim with no structural role.
Tread
Also called: stair tread, step.
The horizontal board you step on, running from the front edge (the nosing) back to the riser behind it.
Pro note: Tread width and nosing overhang are code items, not style choices. Garage/patio steps get 6 screws minimum per tread.
Volute / Turnout
Decorative fittings at a starting newel where the handrail curls (volute, a spiral scroll) or curves outward (turnout) instead of butting the post.
Turnout is a related but distinct, simpler fitting; do not treat as identical to volute.
Wall Rail / Rail Bracket
A wall rail is a handrail mounted directly to the wall (versus baluster-supported); rail brackets are the hardware that anchors it, which must hit studs, never drywall anchors.
What does your crew call it? If you use a different word for something on this page, or we are missing a term you use every day, tell us and we will add it.