Chapter 9 Traffic Areas and Patterns Types of Stairs Spiral U-shaped L-winder Wide-U L or wide-L Straight run Long-run-L Double-L Wide-L

Parts of Stairs Treads Actual “step” of the stair Riser Vertical part of the stair Average residential riser is 7 ¼” Landing A platform used to change stair direction Should be planned for stairs having more than 16 risers

Stairwell Area used for the stairs –Minimum width of stairs is 3’-0” Lighting Controlled by a 3-way switch Headroom Vertical distance between the top of each stair tread and the ceiling Minimum headroom required is 6’-6”

Entrances Four Types -Site -Main -Service -Special Purpose Also called a foyer

Driveways Apron -Driveway extension used to park or turn vehicles Minimum driveway width required is 10’ Minimum inside turning radius is 13’

The Loretto Chapel's Miraculous Staircase