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Clearance @ fire stair tread and door

N

Nathan Saucier

Registered User
Joined
Nov 21, 2016
Messages
7
Location
Washington, DC
Can anyone comment on the minimum distance between the nosing of the top tread and the door opening edge?

The only thing I could find was the minimum size stair landings to be the same depth as the width of the stair.
 
Good morning Nathan,

Welcome to the forum.

I would have to ask your concern for the distance and your reason for questioning the distance?

stairs are required to have landings at the top and bottom of stair flights, exterior doors are required to have landings on both sides, Minimum width of landings for doors is the width of the door.

Though many buildings have larger landing ares, the code is set on minimums.

Thus, what is your concern and how does the door opening edge affect the landing area of the stair nosing?
 
Should be handled by the landing requirement....Are you concerned about someone opening the door and knocking someone back down the stair?
 
If the stair is ascending or descending perpendicular to the door, and the door is out-swinging, the required handrail extension may determine the minimum distance.
 
Per Section 1010.1.6 of the IBC (2015 ed.), doors have to have a landing on each side, and shall have a width not less than the width of the door or the stairway, whichever is greater.
 
The intent of the landing is to limit the possibility of someone needing to step back and down the steps when opening the door, so the Code requires the depth of the landing to be at least equal to the width of the door.
 
Nathan Saucier said:
Can anyone comment on the minimum distance between the nosing of the top tread and the door opening edge?
The only thing I could find was the minimum size stair landings to be the same depth as the width of the stair.
Click to expand...
Which Code? Where is the Project?
 
The minimum distance would be determined by the practical distance needed for the handrail extension as it needs to continue beyond the top riser for a minimum of 12 inches per 2012 IBC 1012.6. Otherwise, there is no other requirement that would say that it could not be zero (theoretically - but not practically).

12 inches
 
At the bottom of of the flight of stairs maybe required to be the depth of the stair plus 12inches

We are speculating without full I need formation.
 
From the 2012 IBC
1009.8 Stairway landings.
There shall be a floor or landing at the top and bottom of each stairway. The width of landings shall not be less than the width of stairways they serve. Every landing shall have a minimum width measured perpendicular to the direction of travel equal to the width of the stairway. Where the stairway has a straight run the depth need not exceed 48 inches ...
 
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