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Old 07-04-2013, 10:51 PM   #1
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Run/Rise Stair Ratio - Is this acceptable?


Hi,
I'm buying a new-build condo, and have the opportunity to redesign the interior. I want to move the staircase, but for it to fit comfortably where I want it, I would need to reduce the run of each stair to around the minimum regulation of 210mm (with a tread depth of 235mm). As the rise would need to stay the same (193mm), I was wondering if this would make the stairs too steep or if this ratio would work fine. I've made a projection of how the stairs would look, and it looks fine on paper. How would it be in real life?
Thanks for your help

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Old 07-04-2013, 11:21 PM   #2
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Run/Rise Stair Ratio - Is this acceptable?


210mm (8.27in) and 235mm (9.25in) are both awfully small treads for my taste.

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Old 07-04-2013, 11:31 PM   #3
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Run/Rise Stair Ratio - Is this acceptable?


Run is ok but rise may be out of code.
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Old 07-04-2013, 11:35 PM   #4
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Run/Rise Stair Ratio - Is this acceptable?


Rise regulations are minimum 125mm/maximum 200mm according to this: http://www.amezz.com/cnbcstairref.html
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Old 07-04-2013, 11:38 PM   #5
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Run/Rise Stair Ratio - Is this acceptable?


Quote:
Originally Posted by QCKiwi View Post
Rise regulations are minimum 125mm/maximum 200mm according to this: http://www.amezz.com/cnbcstairref.html
what is that in real numbers?
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Old 07-04-2013, 11:59 PM   #6
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Run/Rise Stair Ratio - Is this acceptable?


Real numbers? Haha! http://www.expatyourself.com/2010/04...ystem-and-you/
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Old 07-05-2013, 12:04 AM   #7
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Run/Rise Stair Ratio - Is this acceptable?


210mm = 8.27 inches
235mm = 9.25 inches
193mm = 7.60 inches
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Old 07-05-2013, 12:05 AM   #8
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Run/Rise Stair Ratio - Is this acceptable?


Here it's 8-1/4 rise and a 9" run
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Old 07-05-2013, 12:06 AM   #9
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Run/Rise Stair Ratio - Is this acceptable?


You need to check with local inspectors to find out actual code
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Old 07-05-2013, 06:50 AM   #10
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Run/Rise Stair Ratio - Is this acceptable?


Quote:
Originally Posted by TarheelTerp View Post
what is that in real numbers?
Personally,I couldn't agree more.
Here in UK we've had metric for years, but builders still think in the old Imperial system. We buy 8ftx4ft sheets of 12.5mm plasterboard; bricks are 102.5mm wide (the equivalent of 4") and we buy 6m lengths of 4" x 2" timber.
Most people still think of their weight in stones or lbs, and our cars do 'x miles to the gallon'.
The beauty of the old system is that the measures are identifiable and workable; who finds it easier to visualize a millimetre rather than an inch?
(Sorry, off-topic and rant over)
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Old 07-05-2013, 08:44 AM   #11
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Run/Rise Stair Ratio - Is this acceptable?


Have you considered a circular staircase? We put one (a kit) in our log home instead of regular stairs, and we love it. Takes up a circle of floor space only 5 feet in diameter. Be aware, though, that because circulars are so rarely seen any more, some inspectors don't understand how they meet code. We ran into that, and had to get additional information from the stair company. Also, in some jurisdictions a circular cannot be the primary means of access to a space.
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Old 07-05-2013, 10:34 AM   #12
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Run/Rise Stair Ratio - Is this acceptable?


Actually Tony, it's the same here in Canada. Officially metric, but still holding onto a lot of old imperial measures. I grew up in NZ, so visualising inches is as difficult for me as it is for you to visualise centimetres. I've gotten used to it though... somewhat!
As for the spiral, it's not really an option as the downstairs semi-basement space is small and I need to utilise as much space as I can, which includes under the stairs. While in most cases a spiral would save space, in this case it doesn't. Plus, a spiral will add cost.

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