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Extending existing wall studs

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Extending existing wall studs sw 02-21-2007
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Posted by Bob Morrison on February 22, 2007, 11:37 am
In a previous post HerHusband wrote...
> If you can't remove the existing wall for some reason, you could probably
> sister full height studs next to the existing shorter studs. But, that's
> probably more work than just reframing the wall.
>

I could see this being the case if the wall is balloon framed. The number
of fasteners required will depend on the loads.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by sw on February 22, 2007, 12:41 pm
> > I am working on completing drawings for a home in the east end of
> > Toronto. I am showing the existing roof being taken off to facilitate
> > adding a second floor. The existing wood stud walls must be extended
> > to satisfy an owner request for additional headroom.
>
> In most cases, framing one wall directly on top of the other would create a
> pivot point. It would act sort of like a large hinge. Strong winds or
> seismic forces could easily cause the wall to bend (and possibly fail) at
> the point where the two walls meet.
>
> If this wall extends unsupported from the first floor to the second, you
> should tear it out and reframe with continuous studs. Then add fireblocking
> every 8' or so in the studbays.
>
> If you can't remove the existing wall for some reason, you could probably
> sister full height studs next to the existing shorter studs. But, that's
> probably more work than just reframing the wall.
>
> Anthony

I think you've answered my question. I believe it's best to sister a
new 2"X6" wd stud wall to the existing 2"X4". I"ll widen the base
plate to accept. We need the extra depth to obtain the min required
insulation anyways. I should clarify that there is no second floor
yet, just a roof. It's an existing bungalow whose roof we're
removing.
You were very helpful in this, thankyou once again.


Posted by longshot on February 22, 2007, 2:16 pm

>I am working on completing drawings for a home in the east end of
> Toronto. I am showing the existing roof being taken off to facilitate
> adding a second floor. The existing wood stud walls must be extended
> to satisfy an owner request for additional headroom.
>
> Does anyone have a suggestion, or can refer me to a previous post
> where wall studs are extended up, or a short stud wall is added and
> securely attached to the lower stud wall without having to replace the
> existing wall studs?
>
> Thankyou in advance.
>
> Scott.

you could build your mini wall like you are saying & add light gage steel
gussets to each side if you think saving the existing is worth the trouble.

>



Posted by sw on February 22, 2007, 5:30 pm
>
>
> >I am working on completing drawings for a home in the east end of
> > Toronto. I am showing the existing roof being taken off to facilitate
> > adding a second floor. The existing wood stud walls must be extended
> > to satisfy an owner request for additional headroom.
>
> > Does anyone have a suggestion, or can refer me to a previous post
> > where wall studs are extended up, or a short stud wall is added and
> > securely attached to the lower stud wall without having to replace the
> > existing wall studs?
>
> > Thankyou in advance.
>
> > Scott.
>
> you could build your mini wall like you are saying & add light gage steel
> gussets to each side if you think saving the existing is worth the trouble.
>
>
>
> - Hide quoted text -
>
> - Show quoted text -

hmmm. more or less a kind of strapping on the face of the joist. I
think that the nice thing about sistering new 2x6's to the existing
2x4 is that I have more room to achieve the r value im going to need.
Good suggestion though. Thanks


Posted by Alan on February 23, 2007, 2:50 am
Code won't allow extending studs this way for seismic and wind
reasons. The failure is known as "hinging", where the original top
plate rocks off the studs. However, you can support the extension
with angled supports between the new floor joists and original top
plate. This would create a strong triangle that would prevent
hinging, and so the planning department would likely accept this to
stabilize the stem wall without additional engineers ink. The other
approach would be to have a truss company design floor trusses (they
have their own engineers) that would sit on the original top plate,
but which are designed to have added ceiling clearance below.
Otherwise as said, you'll need an engineer, and many engineers aren't
too good at this sort of design work it seems to me. They are more
used to figuring out the basics of load on conventional foundation and
beam situations. But, if you are building up, you may need an
engineer to ensure the existing foundation can take the load.

> I am working on completing drawings for a home in the east end of
> Toronto. I am showing the existing roof being taken off to facilitate
> adding a second floor. The existing wood stud walls must be extended
> to satisfy an owner request for additional headroom.
>
> Does anyone have a suggestion, or can refer me to a previous post
> where wall studs are extended up, or a short stud wall is added and
> securely attached to the lower stud wall without having to replace the
> existing wall studs?
>
> Thankyou in advance.
>
> Scott.



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