WebbWe would need change the stair tread depth to make a 37° slope stair that has an acceptable 7-inch riser height. 7" Riser Height / Tread-Depth-Y = 0.7535 = 37° slope . Again using Mrs. Revere's elementary school … WebbAlthough the ratio can vary depending on the application, local building codes often dictate the minimum and maximum riser heights and minimum tread depth. The 7-11 rule is one that's frequently used (maximum riser height of 7 inches and minimum tread depth of 11 inches). Risers should also be at least 4 inches in height.

1910.25 - Stairways. - Occupational Safety and Health …

WebbThose who study stairs believe a pitch of between 20 and 50 degrees is safe, and being within the range of 30 to 35 degrees is best. Another rule of thumb for riser and tread … WebbRule one says that rise plus run ( r+R) should equal 18 inches. Why? That’s what most people find to be a comfortable stride on most stairs. You can cheat a bit up or down, … firepoint sign in

A Guide to Stair Tread Sizes - Standard Stair Treads

WebbAnother rule of thumb for riser and tread design is that the sum of the two dimensions be between 17 and 17 and one-half inches. If a riser is seven inches high the tread depth should be no more than 10 and one-half inches deep. These dimensions also result in a safe pitch angle of 34 degrees. Tread Depth WebbThe standard thickness of stair tread is up to 1-1/16” of an inch, although 1” stair treads are extremely common and found at all big box home reno stores. Remember also that … WebbStandard Stair Tread Dimensions Here is a drawing detailing our standard stair tread and riser dimensions. These dimensions may be useful when laying out a staircase or if you have general questions about the size … firepoint services newcastle