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https://www.lorettochapel.com/info/staircase
The staircase has two 360 degree turns and no visible means of support. It is said that the staircase was built without nails—only wooden pegs. Questions also surround the number of stair risers relative to the height of the choir loft and about the types of wood and other materials used in …
https://www.askthebuilder.com/loretto-staircase/
The point of my post is that the owners of the staircase are leveraging the LEGEND that the staircase has no means of support. That's WRONG as I state in my article. The curved stringers are simple beams. A beam does not have to be straight and a beam doesn't have to be LEVEL to work.
http://www.pratanacoffeetalk.com/2011/03/mystery-of-staircase-solved.html
Mar 07, 2011 · However, this staircase appears to have a concealed central support, an inner wood stringer of a very small radius that, because of its small size, functions effectively as a central pole. This technique is well known. The staircase also has an additional outer support to one of the columns that support the loft. This support was added later.
https://inspectapedia.com/Stairs/Stair_Stringers.php
Reply: Model building code specifications for stair support stringers. Yes a riser is the vertical board enclosing the space between horizontal walking surfaces, i.e. treads. The stringer is the support for the stairs - it functions as an angled beam and must support both the dead loads and live loads of the building stairway.
https://en.wikipedia.org/wiki/Loretto_Chapel
Loretto Chapel is best known for its "miraculous" spiral staircase, which rises 20 feet (6.1 m) to the choir loft while making two full turns, all without the support of a newel or central pole. The staircase is built mostly out of wood and is held together by wooden pegs and glue rather than nails or other hardware.Architectural style: Gothic Revival
https://www.youtube.com/watch?v=SjT_zIdDuOc
Jan 16, 2013 · - Click on this link for more information about stair building, stairway construction and staircase design. Watch this video to learn more about properly positioning the bottom of a stair …
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