Rise is approximately seven inches and tread is approximately ten inches.
Eight step stringers are a common length so, any business carrying strings should have them!
It depends what the "THIS" in your question is!
As far as steps go, you could get away with a 10 inch wide boards. But, if you are putting in out door steps, which can be subjected to snow, rain or any other inclement weather, you are better off to use two six inch wide board material. WHY, you might ask? Drainage! One, ten inch wide board, exposed to exterior weather could warp or split over time. things could get slippery! Using two six inch wide boards with a 3/8 to .50 space will give you two things. Less chance of warping or splitting AND, there will be drainage for rain, ice or snow that might accumulate! Another consider! Over the years I have designed and built a variety of steps, both for in and out side use. I almost always defer to two six inch wide. boards that are run in parallel and do so for the reasons I have noted above. Installed on a ten inch tread, it will give you a few more inches of overhang which looks better and is safer for climbing or descending. This is an important consideration as the elderly will need and appreciate any safety issue you per-design into your stair way! FYI: A five or ten inch wide board is the raw/fresh dimension, prior to their being dried by seasoning. Be aware what what you think you are buying just may not be so!
Tainc2802, We do not carry the stair stringer with 13 steps at this time. Please contact your local Home Depot PRO associate to discuss special order options.
Lakehouse, Lumber treated to “Ground Contact” has a high chemical retention level and can be placed directly on or in the ground with better protection against rot or decay. It also has 2X the protection compared to Above Ground treatment. For specific details about each product, you might consider comparing the warranty information on the product pages; it is located in the boxed-off Info & Guides section, part-way down the page, on the right.
Stairs, You should have no problem finding a plethora of builders/handymen/carpenters at your Home Depot; ask at the Pro Desk for where they keep business cards or have a listing of these contractors. Whether they are available now, though, is another question.
Gman, That should work.
Ben: The number you are needing is a vertical measurement from the ground floor to the top of the floor you are trying to reach with your steps. Once you know that, the rest is just simple math! The vertical rise for each step is typically 7 inches. Typically the step is 10 inches. Divide the 7 inch dimension into the vertical dimension, and you should have the number of steps you will need. (ie, 7 divided into 70 inches = 10 steps. If you have a odd, not an even number of steps, then order one extra step on your stringer. Trim the extra material off the bottom stringer NOT the top. Doing so will limit the potential dangerous trip factor. Best of luck!
Charlie, This goes back to trigonometry, right triangles, angles, and Pythagorean Equation...if you're into all of that stuff. Our expert says that an 8-step stringer has 7 steps at 6.75 in. height plus 1 step at 5.75 in. = 53 in. for total height. Run is 10 in. x 8 treads = 80 in. for total length. [(53)^2 + (80)^2] = 9,208 in^2. Take the square root, and it equals 95.96 in. for the hypotenuse of the triangle.