What is a closed string?

Closed and open strings

Strings can be either open or closed. A closed string is a string that has no end-points, and therefore is topologically equivalent to a circle. An open string, on the other hand, has two end-points and is topologically equivalent to a line interval.

Also Know, what is a closed string staircase?

A closed string staircase comprises of a closed string with either solid timber or MDF treads and risers. Closed string flights can be between walls and double back on themselves with the aid of landings or tapered treads (winders), or a combination of the two.

How do you attach stair stringers to a house?

Use 10d – 1.5″ hot-dipped galvanized nails. Make sure the top of the stringers are level. Nail the stair stringer connectors into place. Then, nail the 2×12 stair stringers to the connector side flange and bottom.

What size lumber is used for stair stringers?

Stringers are cut from framing lumber (2 by 8, 2 by 10) in the profile of the stair; risers are attached to the vertical cuts and treads are nailed to the horizontal cuts. Stringers cut to the proper dimensions are essential for building a solid set of stairs.

What holds a staircase up?

Baluster. A term for the vertical posts that hold up the handrail. Sometimes simply called guards or spindles. Treads often require two balusters.

How much does it cost to open a staircase?

A complete makeover for a standard staircase falls on the mid or high end of that price range. New treads and risers usually cost about $1,800 to $2,500. New balusters usually cost about $1,200 to $1,600. A complete makeover including treads, risers, balusters, a handrail and newel posts usually costs $4,000 to $8,000.

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What is the stringer?

In journalism, a stringer is a freelance journalist, photographer, or videographer who contributes reports, photos, or videos to a news organization on an ongoing basis but is paid individually for each piece of published or broadcast work. The term is typically confined to news industry jargon.

What is a stairwell landing?

What is a Stair Landing? Landings in a stair is a level floor or platform constructed at a location where the direction of stairs changes, between flights of the stair, or at the top of stair flight.

What is a housed stringer?

A staircase string whose upper edge is straight and parallel to its lower edge; the tread and riser ends are housed in the face of the string and are concealed.

What is an open staircase?

An open staircase is a stairway that does not have stair risers and in which the stairway treads are visible from above and below the stairway.

Keeping this in view, how do you make a stair stringer?


  1. Clamp a guide to the square.
  2. Find the crown.
  3. Lay out the first tread and the second riser.
  4. Lay out the second tread and the third riser.
  5. Mark the back of the top tread.
  6. Mark the plumb cut at the top of the stringer.
  7. Lay out the bottom riser.
  8. Adjust the first riser height.

How many types of staircase are there?

Stairs can be broadly classified into three types: Straight stairs. Turning stairs. Continuous stairs.

  • Straight stairs.
  • Turning stairs.
  • Quarter turn stairs.
  • Half turn stairs.
  • Three quarter turn stairs.
  • Bifurcated stairs.
  • Continuous stairs.

Are stairs at 45 degrees?

For example, if you were crazy and built a staircase with a 12 inch tread and riser, then the angle of the stringer to the floor would be 45 degrees. A more common angle is about 37 degrees.

What is a stair rake?

Rake – Refers to a stairs’ pitch. Rise – In a flight of stairs, it is the vertical distances between the floors of landings that are connect by the flight. It is the vertical measurement from top of tread to top of tread.

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How thick should stair stringers be?

If the stair treads are set into grooves routed into the stringer, in a 2x stringer the groove depth should be 1/2 the thickness of the stringer (typically 3/4″) and additional support by cleats or by gluing and end-screwing through the stringer sides into the treads is good practice.

What is the formula for building stairs?

Determining the Rise

You divide the height by 7 inches; if, say, the floor-to-floor distance is 8 feet, 10 inches (or 106 inches), then you’ll need 15 treads (106 divided by 7 equals 15.14). Next, you divide the height by the number of treads (15 into 106), producing the exact tread height (7.06 inches).

How do you attach stringers?

Attach the stringers to the deck using angle brackets and 3″ galvanized deck screws. Cut a 2×6 board to fit snugly between the two stringers at their base. This will be used to fasten the stairs to the concrete pad. Place the board between the stringers and attach to stringers with 3″ galvanized deck screws.

Beside above, are stairway walls load bearing?

Before removing a wall from around a stairway, determine whether it is load bearing; that is, whether it supports parts of the building above it. A wall probably is load bearing if it is near the center of the house and runs parallel to its length, or is perpendicular to ceiling joists resting on its top.

What is an open stringer?

Also known as an open stringer. Generally used on the open side of a staircase. Stringer is cut as a bridgeboard, and treads are placed on the stringer. Treads visible from the side, overlapping the stringer by 25 mm. With or without risers.

How many stringers do I need for 4 foot wide stairs?

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.