From: Steve Privett <eqretrodr(--nospam--at)earthlink.net>
Date: Sun, 29 Apr 2001 14:57:02 -0700
While you could rebuild the wall completely, I have removed the top
plates, and lapped new stud next to existing. Typically the new do not
go to the sill plate, and the length has been determined by existing
plumbing and/electrical in the wall. Attention must be paid to fully
develop the connection between the original and 'sistered" stud for both
loads perp to wall and vertical loads. Vertical loads can easily be
resolved by adding a short section of stud directly above the existing,
and having the sistered stud tie the two together.
The plywood panel size isn't an issue as you can splice plywood at
approximate mid wall ht with blocking between the studs. The one foot
extension of the lower wall probably isn't a problem with new plywood,
as the chances are good the original structure doesn't have plywood to
begin with, and therefore the lateral capacity of the lower level
probably is substantially below requirements for a two story house.
Remember that when you increase the loads or decease the capacity of
existing structures, the affected elements/portions must be brought up
to the current code. Considering the 97 code, I wouldn't expect any
existing structures to be capable of carrying additional seismic loads
without some retrofit to the original structure.
Another simple question (probably) all the wood design experts.
I thinking about the best way to approach an existing 1 story house
that is getting a 2nd floor addition. Normally, I would assume that
the roof gets removed, floor framing is placed, and the 2nd floor
platform walls will sit over the lower walls just like in a new house.
I have a situation where we are required to raise the original lower
floor ceiling height from 8 ft to 9 ft.What are the various methods to
achieve this? I was thinking that simply adding cripple studs would
not be good to make up the 1 ft difference because I would be relying
on a 1 ft strip of plywood when I was taught not to use plywood with
less than 24" in shear panels. To complicate things, the 2nd floor
ceiling height is 10'-6" so I would have another joint since I believe
plywood is only available in 10' max sheet sizes.
Thanks for any comments .
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