Curtis Lumber - Taking the headache out of Home Improvement

Glossary of Stair Terms

Stair building has many unique terms. Here are the most common terms and their meanings to help you better understand when reading instructions or material on stairs.

Angle Newel: The longer of newel posts used at landings and upper levels where rake rail changes direction and continues or where rake rail rises vertically to meet level rail. Length is governed by the number of risers at this point of vertical transition. Angle newels may be two, three, or four risers high in their base length.

Baluster: A vertical member used between railing and tread or floor, adding safety, support and stability to the balustrade.

Balustrade: The name for the complete and assembled rail system.

Box Newel: A large square newel hollow inside, used in post to post balustrades.

Box Stair: A stair where the stringers house the treads and risers forming a box-like unit.

Bracket: Referred to as tread or stringer bracket. A scroll shaped decorative member usually mitered to the riser and fastened over the open stringer.

Cap: That round portion of a rail fitting which widens, permitting it to set on top of a newel post. Cap fittings are used for an over the post balustrade system.

Cove Moulding: A coved shaped mould used to finish off the joint formed where the face of the riser meets the lower face of the tread nosing.

Easing: (Sometimes called Easement) That portion of a rail fitting which curves, permitting hand rail to move from level up or down, up easing or over easing respectively. It also permits rake rail to move vertically where it meets level rail.

Fillet: A thin moulding that is fitted into plowed hand rail and shoe rail between balusters.

Finished Floor to Finished Floor Height: The vertical distance between the top of the lower finished floor to the top of the upper level finished floor. The total rise of the stair.

Glue Block: A wooden block, square or triangular, glued to the underside of a step. They are used where the tread and riser form an inside corner under each step.

Gooseneck: A rail fitting used where rake rail rises vertically to a balcony or landing. They also permit directional changes.

Hand Rail: The railing used as hand support in balustrade systems.

Header: A floor framing member that runs across the well opening. The top riser of the stair is secured to the header.

Horse: A length of dense dimension lumber cut to run rise requirements to form steps. The horse supports treads and risers.

Landing: An intermediate floor or platform between flights of stairs. Landings permit directional changes in stair travel.

Landing Newel: Refer to Angle Newel.

Landing Tread: A nosed and rabbeted tread-like mould used to form a level surface with the finished floor of landings and upper levels. May also be used to trim around well holes and balconies.

Left Hand: A stair open for balustrade on the left side, ascending the stair. The rail fittings on the left hand side of the stair.

Level Quarterturn: A rail fitting that permits level hand rail to turn 90 degrees; available with cap or without cap.

Level Rail: Handrail used on the level portion of a balustrade.

Newel: A vertical post used to start the balustrade, also used at points of vertical and directional transition. Newel posts are the backbone of balustrade strength.

Open Stair: A stair where the stringer has been cut out and the tread ends are exposed on one or both ends.

Over-the-Post: A balustrade system which uses rail fittings on top of newel posts forming a continuous hand rail.

Pitch: Refer to Rake

Pitch Block: A block of wood that is cut to form a right triangle using the rise and run dimensions of the stair. The pitch block is used to determine the exact point and angle of cut for attachment of fitting to straight rail. The pitch block also determines the angle cuts on balusters, newel posts and hand rail.

Platform: Refer to Landing.

Plow: The grooved out area in the bottom of the hand rail and the top of shoe rail that receive square end balusters. It is fitted with fillet spacers.

Post-to-Post: A balustrade system where hand rail is cut between and attached to square top newel posts.

Rail Bolt: A two ended, threaded steel stud with nut, washer and wood plug. A concealed fastener used to attach hand rail to fittings and newels.

Rail Fitting: Fittings are assembled components that are profiled to match hand rail patterns. They permit directional and vertical changes with hand rail in over-the-post balustrades. Some fittings may be used in post-topost balustrades.

Rake: The angle or pitch of a stair's ascent to the upper level. The rake is established by the rise and run.

Rake Rail: Hand rail used on the ascending portion of a balustrade, follows the pitch or rise of the stair.

Return Nosing: A nosed or rounded moulding used to trim, open end treads. This conceals the end grain.

Right Hand: A stair open for the balustrade on the right side, ascending the stair. The rail fittings on the right hand side of a stair.

Rise: The unit of vertical height for each step in a stair. Determined by dividing the total finish floor to finished floor dimension into equal parts.

Riser: The vertical component of a stair that faces each step between stringers and tread, upon which the treads are placed.

Rosette: A decorative wall plate, larger than hand rail profile, may be round, oval or rectangular, serves as a railing anchor when backing is placed in the wall.

Run: The horizontal travel of a stair. A unit of run or tread run is the distance of travel for each step excluding the tread nose.

Shoe Moulding: A quarter round type mould, higher than wide, generally applied where bottom riser meets finished floor.

Shoe Rail: A flat molded member with a linear groove to receive square bottom balusters for assembly.

Skirt board: A finished face board used to cover the stair horse. May also be used to finish around the well hole.

Starting Easing: A rail fitting that starts the balustrade system and introduces the user to the upward travel of the stair.

Starting Newel: The vertical post used to start a balustrade system.

Starting Step: A decorative first step of a stair. Generally includes tread and riser which lengthen the step beyond the width of the basic stair. Designs are bull nose fully rounded, quarter circle or half circle.

Stringer: A side member of a stair that serves both carriage and finished face. It is generally routed out to receive treads and risers for box stairs. It is mitered to the riser with treads set on top for open stairs.

Sub Rail: A thin linear mould plowed both top and bottom to receive hand rail above and the top of square end balusters below.

Tread: The flat horizontal component of a stair step upon which a person walks.

Wall Rail: Hand rail affixed to the wall by means of mounting brackets. It may be primary hand rail for a box stair and supplementary to a balustrade system.

Wall Rail Bracket: An offsetting metal bracket screwed to the wall upon which wall rail is mounted.

Wedge: A tapered strip of wood driven into stringer routings to fasten treads and risers securely. They also help to prevent squeaks.

Well Hole: The opening frame into floor above a stair.

Winder: A landing divided by risers into triangular shaped steps, usually two or three steps. Caution should be taken when planning to use them as they restrict tread area as they climb and turn.

Wood Plug: A flat round wooden plug usually 1" in diameter, used to plug the holes bored for concealed fasteners.

Click here for a PDF of this page.

Curtis Lumber Co. Inc
21 Convenient Locations in New York and Northern Vermont.
HomeLocationsProduct Selection CenterProject CenterContractor Zone
Sales FlyerContact UsAbout UsEmploymentSite MapCopyright / Liability / Product Availability