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Reply by davidpettinger

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Posted on building stairs

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davidpettinger

661 posts in 4446 days


#1 posted 01-15-2010 04:39 AM

I’ll give you an example to give you a clearer idea of what to do. But always check local building codes.

Let’s pick a random number for the total height distance between two floors. How about 103.5 inches? How can you quickly figure out equal risers for this total rise? Simple! Since I LOVE 7.5 inch risers lets do the math. Divide 103.5 by 7.5…...Bummer, the result is 13.8. That means you would have 13 risers at 7.5 inches and the final one would only be .8 of 7.5 inches. I can tell you that this is unacceptable and someone would trip.

The calculation tells us that we NEED 14 risers since we came up with 13.8. So, let’s divide 103.5 by 14. the result is 7.3928. This means our risers need to be 7.3928 inches. Well, you won’t find that number on a framing square! So how does .3928 inches convert to a fraction on a square? Well the decimal equivalent for 1/8th inch is .125 this means that 3/8 inch is 3 times .125 or .375. So our treads are just a tad over 7 and 3/8 inches. In reality they are actually 7 and 50/128 inches. Heck don’t even try to look for 128ths on a framing square! The point is this: See how simple it was to do the math? Always shoot for 7.5 inch risers and then go whatever direction you have to go to make them work out equal keeping in mind your local code’s MAXIMUM riser height.

-- Methods are many,Principles are few.Methods change often,Principles never do.


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