construction Stairs With A Platform Or Landing

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When Designing stairs with a platform or landing in the middle, a tasteless mistake is to first build a landing at an arbitrary level, then originate and build the upper and lower staircases. Ninety-five percent of the time this results in the upper and lower staircases having noticeably separate geometry. By analyzing your whole staircase first, then building your platform at the literal, level, you will end up with matching flights.

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First of all, let me say that stair-building is one of the most complicated aspects of carpentry (or ironwork), so Don'T Rush. Rushing normally results in poor results and wasted lumber.

In summary, here are the steps (no pun intended) ...

Design A Phantom Set Of Stairs For The whole Rise (Ignoring The Platform)

Calculate A Rise Per Step That Meets Local Code (e.g. 7 1/8)

Build A Platform At One Of The Step Levels (e.g. 21 3/8)

Design The Upper Flight, Using The Same Rise Per Step As The Phantom Staircase

Design The Lower Flight, Using The Same Rise Per Step And Run Per Step As The Upper Staircase

Now You Have Two Flights With Matching Geometry, production A mixture Staircase

In greater detail ...

Most importantly, you want the Rise Per Step for both the top and lowest flights to be the same. Your local building code probably requires this, and even regardless of code, the stairs will look and feel best if Rise Per Step, Run Per Step and all the other figures are the same for both flights.

In order to ensure that you have equal Rise Per Step on both flights, first originate a phantom set of stairs using your total extensive Rise like you're production one long set of stairs instead of breaking it in two. (You don't admittedly need to worry about the extensive Run at this point.) Take your extensive Rise and divide it by your local building code maximum Rise Per Step (7-1/2 inches is a tasteless value.) This tells you the number of steps you will need. Since you can't have a fraction of a step, round this number up to get an integer, then divided your extensive Rise by this new number to get your calculated Rise Per Step.

Here's an example:

84.5 extensive Rise
7.5 building Code Maximum Rise Per Step

divide 84.5 by 7.5 = 11.27

11.27 is the ideal number of steps

round up to 12 full steps

now divide 84.5 by 12

7.04 this is your calculated Rise Per Step

You can now build a platform or landing for your mixture staircase at a multiple of 7.04 inches, and both the upper and lower flights will have the same Rise Per Step. For example, if you build the platform at 21.12 inches (3 x 7.04), it would be three steps up from the bottom. If you build it at 35.20 inches, it will be five steps from the bottom.

Now, since the upper flight normally has space constraints, and the lower flight normally doesn't, originate your upper flight first. Use the same process for the Upper extensive Rise and you should end up with the same Rise Per Step (7.04). intuit your Run Per Step and make sure to comprise some overhang for the treads. (I've advanced a staircase calculator for this at: http://www.Shalla.Net .) Now use these same Rise Per Step, Run Per Step, Tread Size, and Tread Overhang to originate your lower flight. Your upper and lower flights will now have matching geometry.

The key point here is that you have to build your platform at the right level in order to have matching upper and lower flights.

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