presentation 37:
DESCRIPTION
Presentation 37:. STAIRWELL LENGTH AND HEADROOM. Stairwell Length and Headroom. A stairwell is the opening in a floor through which stairs are used. Its length depends on the unit rise and unit run of the stairs. Sufficient headroom must be maintained along the entire stair. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/1.jpg)
1
Presentation 37:
STAIRWELL LENGTH AND HEADROOM
![Page 2: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/2.jpg)
2
Stairwell Lengthand Headroom
• A stairwell is the opening in a floor through which stairs are used.
• Its length depends on the unit rise and unit run of the stairs.
• Sufficient headroom must be maintained along the entire stair.
![Page 3: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/3.jpg)
3
Stairwell Lengthand Headroom
Stairwell length
Hea
droo
mUnit Rise
Unit Run
• Headroom must be more than 6′- 8″ (80″).
• The stairwell length is adjusted to maintain headroom.
![Page 4: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/4.jpg)
4
Stairwell Length
• Gentle stairs need a longer stairwell length to allow for the headroom.
Stairwell length
![Page 5: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/5.jpg)
5
Stairwell Length
Stairwell length• How many unit runs under the opening?
![Page 6: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/6.jpg)
6
Stairwell Length
Stairwell length• How many unit runs under the opening?
• This number depends on the number of rises under the opening.
![Page 7: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/7.jpg)
7
Headroom
• Number of rises is related to the desired headroom.
Hea
droo
m
![Page 8: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/8.jpg)
8
Headroom
• Number of rises is related to the desired headroom.
Upper Construction
Hea
droo
m• Note where the headroom is measured to on top.
• Upper construction must be included with the headroom.
![Page 9: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/9.jpg)
9
Stairwell Length Procedure
1. Add desired headroom to upper construction measurement.
2. Divide this number by the unit rise and round up. (This is # of unit runs).
3. Multiply this number by unit run.
![Page 10: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/10.jpg)
10
Stairwell Length Calculation
• Determine stairwell length if: 12 ½″
10 ½″
7 ½″80
″
Unit rise = 7 ½″
Unit run = 10 ½″
Headroom = 80″
Upper const. = 12 ½″
![Page 11: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/11.jpg)
11
Calculation
• Add headroom to upper construction.80 + 12 ½″ = 92 ½″ total clearance
• Divide by unit rise and round up.
92 ½″ ÷ 7 ½″ = 12.333 → 13 rises
• Multiply by unit run.
13 x 10 ½″ = 136 ½″ Stairwell Length.
![Page 12: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/12.jpg)
12
Stairwell Length Calculation
• Stairwell length should be 136 ½″.
7 ½″
10 ½″
12 ½″
80″
136 ½″
![Page 13: Presentation 37:](https://reader036.vdocuments.mx/reader036/viewer/2022070401/5681365e550346895d9debc6/html5/thumbnails/13.jpg)
13
Conclusions
• Headroom is typically more than 80″.
• Stairwell length is determined from headroom, upper construction thickness, unit rise, and unit run.