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Re: Design of Top Plates

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The top plates carry the floor joists.  The rim joist
carries framing load from above.  The end nails are
just there to help hold everything together.  If you have
a Trus-Joist catalog, take a look at the residential
framing details.  I agree that aligning the joists with the
studs below is the best way to go, but I have also been
around too many contractors.  No matter how well it's
detailed, they will find a way to screw it up.

Dan Goodrich, P.E.


----- Original Message -----
From: "Chris TSE" <cyltse(--nospam--at)pacbell.net>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, December 28, 2000 2:08 PM
Subject: Re: Design of Top Plates


> Unless the joists perpendicular to the rim joists is carefully detailed to
make
> the joists supported by the rim joist with hangers, I doubt you will get
such a
> nice job done. At most, you will get a couple of end nails through the rim
> joist to the regular joist. When it is the case, the floor loads still
rest onto the
> top plates.
> Aligning the floor joists with the studs below is still the simplest way
to go!
> Chris Tse
> Sunnyvale
>
> Ed.Haninger(--nospam--at)Fluor.com wrote:
>
> > For joist construction:  A rim joist is typically a member the same size
as
> > the joist,  which is placed on the end of the joists, flush with the
outer
> > face of the top plate.   For example, if the joists are 2x10's, the rim
> > joist will be a 2x10.  The rim joist will be located on the top plate
and
> > nailed to end of each joist.   If you look at multilevel wood
construction
> > in the framing stage, you will see a wide member at each floor level.
This
> > is the rim joist.  When constructed in this manner, this member will
> > distribute the joist load to the studs.
> >
> > Truss construction may not work like this.
> >
> > Ed Haninger
> > Fluor Daniel
> >
> > ===============================
> >
> > "Speck, Todd M" <tmspeck(--nospam--at)pbsj.com> on 12/28/2000 11:05:29 AM
> >
> > Please respond to seaint(--nospam--at)seaint.org
> >
> > To:   "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
> > cc:
> >
> > Subject:  RE: Design of Top Plates
> >
> > I'm not trying to argue with anyone,  but I have additional questions
with
> > this suggested alternative.
> >
> > if a rim joist is used...
> >
> > I assume that the trusses bear top chord on the rim joist.
> >
> > I also assume that the rim joist is made of top and bottom chords with
> > diagonal or vertical "webbing".  if this is the case the top chord of
the
> > rim joist now needs to be designed for a point load of 7000+ lbs.
> >
> > I'm not real familiar with a rim joist,  but I don't see how a top chord
of
> > a rim joist can take this load if a dbl top plate can't??  what's the
> > configuration of a rim joist?
> >
>
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