H-5 Flashcards
Describe Total Rise
the vertical distance from finish floor to finish floor
Describe Total Run
the horizontal distance from the face of the bottom riser to the face of the top riser
Describe Rise
The vertical distance from one step to the next
Describe Run
The horizontal distance from one step to the next
Describe nosing line
an imaginary line drawn along the top of the edge of the nosings
Describe finished opening
the horizontal distance from the edge of the nosing at the upper landing to the opening edge of the finish at the other end of the stairwell opening
What is the difference between a long “L” stair and a wide “L” stair?
A long “L” has a long flight and short a short flight connected by a landing or winders. A wide “L” has two similar length flights at right angles to each other.
When is a landing required in a stairway?
A landing is required when the total rise for the stairway is greater than 3.7m
What is the difference between an “open stairwell” and a “closed stairwell?”
Open stairwells have one or both sides open to a room or hallway. Closed stairwells are enclosed on both sides.
What are the main parts of a balustrade?
newel posts, handrail, balusters
What is a semi-housed stringer?
a plain stringer laminated with a cut-out stringer
What takes precedence over proportioning formulas
BC Building Code minmum 255mm
What is the preferred angle of a stair?
30 and 35 degrees
Where are “service stairs” used?
Utility rooms or rooms used by service workers familiar with the stairs
What are the most comfortable units of rise and run?
7” and 10” (180 mm and 250 mm)
Calculate the rise if the total rise 3150 mm and the desired rise is 178
3150 mm (total rise) divided by 178 (desired rise) = 17.69 rises (round up to 18)
3150 mm (total rise) divided by 18 (# of rises) = 175 (rise)
Calculate the run if the rise is 183mm. Use the stair proportioning formula “rise plus run = 450mm”
450mm - 183 = 267 mm
Calculate the unit of bridge for a stair with a rise of 178mm and a run of 255mm
square root 178(square) + 255(square) = 310.981
Calculate the run if total rise is 10’4. Use a desired rise of 7” and the stair proportioning formula” twice the rise plus run = 24”
FSO/2245 = 255/175
Finished stairwell opening = 3271
Rough stairwell opening = 3346
Calculate the rough stairwell opening if the rise is 175mm and the run is 255mm. use the minimum headroom requirement for residential stairs and a floor thickness of 295mm
FSO = 245
1950+295 175
Finished stairwell opening = 3143
rough stairwell opening = 3143mm + 75mm = 3218
Calculate the rough stairwell opening if the rise is 7 1/4” and the run is 10”. use the minimum headroom requirement for residential stairs and a floor thickness of 12 1/8”
Headroom: 1950mm/25.4 = 76.772”
Finished stairwell opening = 119.858”
rough stairwell opening = 119.858” + 3” = 122 7/8”
How is total rise measured?
From the finished floor level at the bottom of the stairs to the finished floor level at the top of the stairs
How is the floor thickness caluclated?
The sum of the ceiling finish, the joist depth, the subfloor thickness, and the finished floor thickness.
Describe the term “graspable”
Able to grip without having to stretch their hand
What two parts make up a semi-housed stringer
a plain stringer and a cut-out stringer
How deep are the gains on a housed stringer?
about 1/2”
