The Challenge to all carpenters.....Fun with math! Ok so theoretically (not) someone, let's say a friend, wants to play with her arsenal of tools by building a stairway-not as far as heaven but equally challenging.
So from the ground to the doorway is 37" and this person likes the steps to the art gallery and would copy them but there are only 2 and she needs about 5 (guessing). The 'friend" would like 6" between steps and 11" wide boards as steps. Only 2 risers are needed at each end and steps can overlap the risers. I imagine pressure treated wood only and the wood is 2x12's.
She's capable of buying a right angle tool and using a circular saw but can't figure out what sort of pattern she needs, like what the cuts should be and it's VERY confusing. If she hadn't doled out hundreds of $$ for remodel, gallery etc my "friend" would hire someone but she knows it's a waste of time getting anyone to do anything correctly in E.Bumfk TN and is tired of replacing sexy pajamas the workers take to (I think) masterbate into. So did I already say this was VERY confusing? It is. Anyone with the math skills just jump in here anytime to help with 1-how many stairs, 2-How the cuts for each step is made to go up 37". Thanks so much ahead of time for any help I may get cuz there is no god to figure this crap out for me. 
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Feel free to reply to any comment by clicking the "Reply" button.If only there were some online tools for this sort of thing!
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jerry99
Level 8
Sep 14, 2019
1
37÷5=7.4
That means 5 steps rising 7.4 inches.
3/8=0.375 and 7/16=0.4375
In other words, 0.4 is between 3/8 and 7/16.
13/32=0.40625 which is very close to 0.4, but a little larger.
Accuracy building stairs is critical, because people will trip on stairs with 1/16" difference in riser height. Thus, measuring one stair from the topz, the next one from your first measurement, the third one from the second, etc. will result in errors of more than 1/16, usually. Thus it is best to measure all from the top or bottom. These measurements follow.
(7+13/32, 14+26/32, 22+7/32, 29+20/32, 37+1/32) either the first or last step is off by 1/32. Note: 26/32=13/16 and 20/32=5/8.
Tread width should be 11+1/2 or a little larger. A 1x12 is pretty close to 11+1/2, so cut the three 2x12s (stringers), which are used for sides and middle of the stairs to which the risers and treads are nailed or screwed, to allow for treads a bit wider than 11+1/2. I recommend 12 inches. However, cut the riser height exactly. Make every cut as exact as possible.
You will need a framing square and the following to assure accuracy:
[homedepot.com]
EdEarl
Level 8
Sep 14, 2019
0
@K9Kohle789 YW Good luck
If you get stuck, ask again for help.
Double check my arithmetic, and measure more than once before cutting. After you measure all three stringers, compare the marks you made on each one against the others, by sitting one on top of another or beside one another.
@K9Kohle789 As long as the existing risers are sound, that's a good way to go. Treat all the existing wood with a preservative, such as Thompson's Water Seal. A store brand may be more cost effective.
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