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2. Stair nosing - Wikipedia

   en.wikipedia.org/wiki/Stair_nosing

   The nosing is the protrusion beyond the riser when vertical risers are used, or beyond the back of the tread below, when angled risers or no risers are used. Anti-slip strips or nosings may be applied. These stair parts can be manufactured from a variety of materials including aluminum, vinyl, and wood.

3. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   The dimensions of a stair, in particular the rise height and going of the steps, should remain the same along the stairs. [14] The following stair dimensions are important: The rise height or rise of each step is measured from the top of one tread to the next. It is not the physical height of the riser; the latter excludes the thickness of the ...

4. Handrail - Wikipedia

   en.wikipedia.org/wiki/Handrail

   A maximum height of 28 inches (711 mm) measured to the top of the gripping surface from the ramp surface or stair nosing is recommended for handrails designed for children. Sufficient vertical clearance between upper and lower handrails, 9 inches (229 mm) minimum, should be provided to help prevent entrapment. [6]

5. Block-stacking problem - Wikipedia

   en.wikipedia.org/wiki/Block-stacking_problem

   The first nine blocks in the solution to the single-wide block-stacking problem with the overhangs indicated. In statics, the block-stacking problem (sometimes known as The Leaning Tower of Lire (Johnson 1955), also the book-stacking problem, or a number of other similar terms) is a puzzle concerning the stacking of blocks at the edge of a table.

6. Foot (unit) - Wikipedia

   en.wikipedia.org/wiki/Foot_(unit)

   Its exact size varied from city to city and could range between 270 mm (10.6 in) and 350 mm (13.8 in), but lengths used for temple construction appear to have been about 295 mm (11.6 in) to 325 mm (12.8 in); the former was close to the size of the Roman foot. The standard Roman foot (pes) was normally about 295.7 mm (11.6 in) (97% of today's ...

7. Staircase - Wikipedia

   en.wikipedia.org/wiki/Staircase

   A stairwell or stair room is a room in a building where a stair is located, and is used to connect walkways between floors so that one can move in height. [1] Collectively, a set of stairs and a stairwell is referred to as a staircase or stairway .

8. Guard rail - Wikipedia

   en.wikipedia.org/wiki/Guard_rail

   In the US, under OSHA Standard 1910.28(b)(15), employees who work on surfaces that are 4 feet (1.2 m) or higher off of the ground must have personal fall protection systems in place, such as handrails or guardrails. [7]

9. Overhang (architecture) - Wikipedia

   en.wikipedia.org/wiki/Overhang_(architecture)

   Overhang on 16th century Tomb of Salim Chishti, Fatehpur Sikri, India In architecture , an overhang is a protruding structure that may provide protection for lower levels. Overhangs on two sides of Pennsylvania Dutch barns protect doors, windows, and other lower-level structures.