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Nosings required on stairs?
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Re: Nosings required on stairs? By  CBO-3176

Posts: 0

10/17/2005 5:08:00 PM

Just a stab in the dark here.

The IRC provides an exception to the nosing requirement for treads with a minimum depth of 11 inches. Since the IBC minimum tread is 11 inches it could be reasoned that a nosing would not be required????


   

Re: Nosings required on stairs? By  peach!!

Posts: 0

10/17/2005 5:25:00 PM

right or wrong, I''ve seen commercial (7/11) stairs without them.. because the Code is not specific


   

Re: Nosings required on stairs? By  TomW702

Posts: 0

10/18/2005 2:12:00 PM

I agree with CBO on this one. :cool:


   

Re: Nosings required on stairs? By  HARLEYBOY

Posts: 0

10/18/2005 3:54:00 PM

You would also need to refer to the 1998 ANSI A117.1 section 504.5 which regulates nosings on stairs required to be accessible (just about any commercial stair).


   

Re: Nosings required on stairs? By  Bill Conner

Posts: 0

10/18/2005 5:09:00 PM

I believe that the consensus is that no nosing is safest so it is logical there is no minimum.


   

Re: Nosings required on stairs? By  Z-Builder

Posts: 0

10/18/2005 7:17:00 PM

IMHO Stairway treads WITHOUT nosings are dangerous!


   

Re: Nosings required on stairs? By  Darren Miller

Posts: 0

10/19/2005 4:43:00 AM

We just went over this last night is class;

Nosings are not required on stairs. The Building code commentary has a diagram showing correct measurement methods of risers & treads with and without nosings.


D


   

Re: Nosings required on stairs? By  The Enforcer

Posts: 0

10/19/2005 12:51:00 PM

Stairs without nosings are OK.

If you have them though, they are regulated.


   

Re: Nosings required on stairs? By  pwood

Posts: 0

10/19/2005 1:21:00 PM

99 out of 100 carpet installers say no to nose :D


   

Re: Nosings required on stairs? By  Bill Conner

Posts: 0

10/19/2005 2:49:00 PM

In response to Z-Builder, I''m guessing you consider the nosing as a means to a larger depth of tread and I would agree that the current IBC 11" minimum is just that: a minimum standard, and not necessarily good design or the best design. There is little doubt that there will be fewer stumbles and resultant falls with deeper treads. Unfortunately, adding nosings to already minimum treads creates a hazard for many individuals who for whatever reason drag their foot close to the nosing and catch their toe under it, causing them to stumble and fall.

You can have both the additional safety and no nosings if you design and build stairs with 11 1/2 or 12" treads.


   

Re: Nosings required on stairs? By  constructionarbitrator

Posts: 0

10/19/2005 7:31:00 PM

Traditional stair tread stock was 1"x11?" (milled out of 5/4" stock), so we cut our stringers to 10", this gave us an overhang of 1?" so we could put a ?"x? cove mold under the tread and leave us ?" overhang for the round nosing of the tread to return before the cove started. I was trained to cut all stringers at 7" to 7?"x10 as the ideal stair. This is what a stair should look like!

[IMG]http://www.stairsupplies.com/ProductImages/treads/8650StartingStepLarge.jpg[/IMG]
Can you imagine this stair without a nosing?


When wall to wall carpeting came onto the seen, the carpet layers had to tuck the carpet up under the cove, and cheap builders decided they could save money by eliminating the nosing and build their stairs out of framing lumber with no nosing or cove.

I still don''t like them, they look cheap and don''t feel right to an septuagenarian like me.


   

Re: Nosings required on stairs? By  constructionarbitrator

Posts: 0

10/19/2005 7:31:00 PM

Traditional stair tread stock was 1"x11?" (milled out of 5/4" stock), so we cut our stringers to 10", this gave us an overhang of 1?" so we could put a ?"x? cove mold under the tread and leave us ?" overhang for the round nosing of the tread to return before the cove started. I was trained to cut all stringers at 7" to 7?"x10 as the ideal stair. This is what a stair should look like!

[IMG]http://www.stairsupplies.com/ProductImages/treads/8650StartingStepLarge.jpg[/IMG]
Can you imagine this stair without a nosing?


When wall to wall carpeting came onto the seen, the carpet layers had to tuck the carpet up under the cove, and cheap builders decided they could save money by eliminating the nosing and build their stairs out of framing lumber with no nosing or cove.

I still don''t like them, they look cheap and don''t feel right to an septuagenarian like me.


   

Re: Nosings required on stairs? By  peach!!

Posts: 0

10/19/2005 7:38:00 PM

it''s ergonomics really... how do people''s brains react to the stairs.. most people don''t have an issue with 11" treads (with or without a nosing).. For little people (like me).. actually, a nosing is a problem, because my feet aren''t as big as some.. I''m a dragger, I guess (more up the stairs than down) is an issue for me.. plain old 7/11 stairs work for me !! (actually, 8 1/2" treads with a 3/4" nosing works for me, so whadda I know)


   

Re: Nosings required on stairs? By  constructionarbitrator

Posts: 0

10/19/2005 8:33:00 PM

In the old days the rule of thumb was that your rise plus your tread should always equal 18", so if your rise was only 6" you had to rip a piece of stair tread and add 1" behind the 11" so you had a 6 in 12, if you had an 8" rise you ripped down your tread to 10", 7 in 11 was the ideal, 7?" rise you ripped ?" off the tread. That formula always felt ergonomically best to me because that''s what I am used to. A 4" rise between floor levels required us to make up a 14" deep tread board.


   

Re: Nosings required on stairs? By  constructionarbitrator

Posts: 0

10/19/2005 8:33:00 PM

In the old days the rule of thumb was that your rise plus your tread should always equal 18", so if your rise was only 6" you had to rip a piece of stair tread and add 1" behind the 11" so you had a 6 in 12, if you had an 8" rise you ripped down your tread to 10", 7 in 11 was the ideal, 7?" rise you ripped ?" off the tread. That formula always felt ergonomically best to me because that''s what I am used to. A 4" rise between floor levels required us to make up a 14" deep tread board.


   

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