What are stair risers and stringers?

Risers or “kick boards” are the vertical component of a stair that supports the treads. Some architectural stair designs don’t use risers; these are called “open-riser” stairs.

Also know, what is a stringer in construction?

Definition. String, stringer. A timber or other support for cross members in floors or ceilings. In stairs, the supporting member for stair treads. Usually a 2 X 12 inch plank notched to receive the treads.

What do you call the side of a staircase?

The handrails up the side (or sides) of a stairway and, as an extension, along the edge of a landing. The bottom step of a staircase which curves around sideways beyond the side of the staircase.

How far can a stair go without a landing?

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.

What goes on first stair tread or riser?

Treads and risers install should start at the bottom step. First the riser and then the tread. However, on the tread you leave a 1/4 inch gap on the back edge and then install the next riser. Your riser should be at least 1/2″ thick and the tread no less than 1″ thick.

How far apart do stair stringers have to be?

Cut stringers can be spaced no more than 18 inches on center, so a 3-foot-wide staircase needs three stringers, and a set of slightly wider stairs (say 3 feet 6 inches) needs four stringers. The maximum 18-inch spacing presumes treads of 5/4-inch wood decking or 2-by stock.

What is the building code for deck stairs?

Now, some common code requirements, along with our recommendations: – The stair’s treads should be at least 36 inches wide. We think stairs should be at least 48 inches wide, so they don’t feel cramped. – The maximum allowable stair rise is 7 3/4 inches, and the minimum stair rise is 4 inches.

What is the stair tread?

A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations.

What is the maximum tread depth of a step?

Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Stair tread depths shall be 11 inches (279 mm) minimum. The riser height shall be measured vertically between the leading edges of adjacent treads.

What is a stringer in construction?

Definition. String, stringer. A timber or other support for cross members in floors or ceilings. In stairs, the supporting member for stair treads. Usually a 2 X 12 inch plank notched to receive the treads.

What is a beam and stringer?

The load may be a floor or roof in a building, in which case the beam is called a floor joist or a roof joist. In a bridge deck the lightly loaded longitudinal beams are the stringers; the heavier, transverse members are called floor beams.

What is a stringer of fish?

A fish stringer is a line of rope or chain along which a fisherman can string fish so they can be immersed and kept alive in water. A rope stringer (pictured) is the simplest type of fish stringer. It consists of a line of rope or wire with a stringing needle made of metal or hardwood at one end.

What is the most comfortable angle for stairs?

The angle is based on the amount of space available, but is commonly determined by the rise and run of a stair. With a 7 inch riser and an 11 inch tread (this is usually a minimum) you get an angle of arctan(7/11) or 32 degrees.

How many risers are allowed before a handrail is required?

Less than 4 risers and the stairs don’t require a handrail. But because of the drop in grade on the right side, a guardrail is required. These stairs have 4 risers do a handrail is required. However, since the top of the deck is less than 30 inches guards are not reqired.

How many steps are allowed before a handrail is required?

To get to your question – the code doesn’t refer to the exterior in steps but states from finished floor or platform to finished grade in excess of 30″ requires a guard rail. It’s with interior they mention any stairway with more than 3 risers (2 steps) will require a handrail.

What is the code for a stair railing?

(c) The top of stair railings, handrails and handrail extensions installed on or after April 3, 1997, shall be at a vertical height between 34 and 38 inches above the nosing of treads and landings. For stairs installed before April 3, 1997, this height shall be between 30 and 38 inches.

What is code for a handrail?

R311.7.7.1 Height. 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).

What is code for stair railing height?

(7) When the top edge of a stair rail system also serves as a handrail, the height of the top edge shall be not more than 37 inches (94 cm) nor less than 36 inches (91.5 cm) from the upper surface of the stair rail system to the surface of the tread, in line with the face of the riser at the forward edge of the tread.

What is OSHA handrail height?

Railing, toe boards, and cover specifications. (1) A standard railing shall consist of top rail, intermediate rail, and posts, and shall have a vertical height of 42 inches nominal from upper surface of top rail to floor, platform, runway, or ramp level.

What is the minimum height of a stair tread?

All steps on a flight of stairs shall have uniform riser heights and uniform tread depth. Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) maximum. Treads shall be 11 inches (280 mm) deep minimum, measured from riser to riser.

How thick does a stair tread need to be?

As you may have noted from the sketches and text above, typically building codes for stairs specify minimum stair tread thickness (1″ if supported by a riser at front, or 1 1/2″ thick treads if the stairs are open-construction without risers), but they do not specify a maximum allowable tread thickness.

How tall is a stair?

The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run). More exactly, no more than 7 3/4 inches for the riser (vertical) and a minimum of 10 inches for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.

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