2009 IRC stair treads and risers

[skipharper]

In Virginia every time the new code is adopted we continue to ammend the stair rise and tread to read different from what is in the current IRC. (Less restrictive) Are any other States doing this to your knowledge?

 

[steveray]

I believe CT does also...

 

[Inspector Gift]

both Oregon and Montana have also amended the risers to allow 8" max and the tread treads to a minimum of 9".

 

[mtlogcabin]

Fo IRC buildings Montana is 8 1/4" riser. In our jurisdiction on new construction we usually see 11" treads but 9" is allowed.

 

[GBrackins]

Massachusetts amended to allow 8-1/4" maximum riser, minimum 9" tread

 

[Francis Vineyard]

Massachusetts amended to allow 8-1/4" maximum riser, minimum 9" tread

Same as Virginia

Francis

 

[fatboy]

No statewide adoption in CO, no local amendments. Don't know of anyone in CO that amends the section either.

 

[kyhowey]

Kentucky is 8 1/4" rise 9" tread. Same as Mass and Virginia

 

[jar546]

Pennsylvania for Residential ONLY

8-1/4" Rise, 9" Tread

 

[TJacobs]

Our jurisdiction does not enact amendments that weaken the codes.

 

[georgia plans exam]

Georgia allows the 1st and last riser to vary from the other risers by as much as 3/4" and allows a 9" tread depth.

GPE

 

[skipharper]

I like TJacobs thoughts but maybe it really is true what some builders tell me--you can't build a cape cod with IRC compliant stairs--LMAO

 

[Sifu]

As of the time I left NC, they also have a different requirement. 8 1/4" riser, 9" tread, 3/4" total differential and 3/8" adjacent differential for risers, allowance for the bottom riser of an exterior set of steps. Not really an amendment, they have their own code but it is mostly the same as the I-codes. I have 2009 NC codes but not the 2012, not sure if they changed it but I doubt it.

 

[Daddy-0-]

I kind of agree with you on this one Skip. Of course it is hard to find a carpenter that can still cut a stair stringer so maybe we shouldn't confuse them more!!!

 

[Architect1281]

RI has always had and maintained in residential 8-1/4 rise 9" tread - we have smaller feet and longer legs than the IRC

 

[Paul Sweet]

Stairs will require about 2 feet more run for a 9 ft. floor-to-floor height with the current IBC requirements. It doesn't make much difference in McMansions, but it won't fit if you're trying to build a 1500 SF cape with a straight stair parallel to the roof slope