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Re: Steel Stair Treads

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Rich,

For a straight steel tread closed riser (checker plate) the tread and riser
usually consists of a bent plate with 1" nosing offset created by the
sloping riser.  An additional lip is usually added to the tread interior for
stiffness and interlock, the next riser sits in front of it.

Many of the engineering designs I see include a bearing angle for connection
of the tread to the stringer, but it isn't really necessary, a direct welded
connection works fine.

Paul Feather PE, SE
pfeather(--nospam--at)SE-Solutions.net
www.SE-Solutions.net
----- Original Message ----- 
From: "richard lewis" <rlewistx(--nospam--at)juno.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, November 06, 2003 9:02 AM
Subject: Steel Stair Treads


> Typically I don't detail steel stairs, but leave them up to the misc.
> steel fabricator.  I need to detail them on one particular project, an
> exterior fire exit stair.  It will be all steel construction with no
> concrete pan  filler.  I have the NAAMM manual for stairs but it doesn't
> give me the information I am looking for.  The IBC requires a 7" max
> riser and an 11" tread.  I can overlap the tread nosing by up to 1.25".
> I recall typical details in the past of 1" overlap.  The IBC requires a
> closed riser.  The NAAMM manual doesn't have information on closed
> riser/treads with a sloping riser.  What is typically done for treads and
> risers?
> Thanks.
>
> Rich
>
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