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Posted by Wayne Whitney on August 19, 2007, 12:11 pm
> I have a bearing wall in a bungalow I'm remodeling. The wall runs
> the length of the living room, and is pretty much in the centre of
> the house, running parallel to the eaves. There is a wall in the
> basement directly below, which presumably is a beam with teleposts.
You need to specify the width of the house perpendicular to the wall,
and what is being supported by the wall. It sounds like the wall is
an interior bearing wall supporting the first floor ceiling joists and
the attic space above. Is that right?
> What size beam do I need to use in this instance, (ideally using
> regular lumber - I have some height to work with, probably enough
> room for 2x10s if necessary), and how many studs need to support
> each side of it?
According to the 2006 IBC, in a 28 foot wide house, for an opening in
an interior bearing wall that supports "one floor", double 2x10s with
two jack studs each side will span up to 6' 1". I assume "one floor"
means living space at 40 lbs/ft^2 live load, not attic storage space
at 20 lbs/ft^2 live load.
Cheers, Wayne
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Posted by Wayne Whitney on August 19, 2007, 3:36 pm
> It sounds like I should be okay with 2 2x10s plus 2 jack studs, and
> if I use 2x12s, all the better. Does this sound right?
I forgot to mention that you need to specify the type of roof system.
Is it conventionally framed with rafters and ceiling joists? If so,
double 2x10s with double jack studs on each side is adequate to span
6'6" in an interior bearing wall supporting one floor in a house 24'
wide, according to the 2006 IBC. If you have a cathedral ceiling with
a structural ridge, or if you have trusses that depend on the bearing
wall, then that is beyond the scope of the IBC prescriptive practices,
to my knowledge.
Cheers, Wayne
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Posted by Paul Franklin on August 19, 2007, 5:59 pm
On Sun, 19 Aug 2007 19:36:12 GMT, Wayne Whitney
>
>> It sounds like I should be okay with 2 2x10s plus 2 jack studs, and
>> if I use 2x12s, all the better. Does this sound right?
>
>I forgot to mention that you need to specify the type of roof system.
>Is it conventionally framed with rafters and ceiling joists? If so,
>double 2x10s with double jack studs on each side is adequate to span
>6'6" in an interior bearing wall supporting one floor in a house 24'
>wide, according to the 2006 IBC. If you have a cathedral ceiling with
>a structural ridge, or if you have trusses that depend on the bearing
>wall, then that is beyond the scope of the IBC prescriptive practices,
>to my knowledge.
>
>Cheers, Wayne
You've also got to consider the fact that you are converting load that
was spread evenly over 6'6" (well, fairly evenly) into two point loads
underneath the jack studs. If there's a continuous beam directly
underneath the existing wall, it's probably no issue. But if the
floor joists run perpendicular to the wall on top of the beam below,
then you at least have to make sure there's solid blocking underneath
the jack studs to transfer the load to the beam. Hard to describe,
but you need to make sure the load from the jack studs is transferred
directly to the beam underneath, and not dependent on just the floor
sheathing or bottom wall plate to carry it to a joist or beam nearby.
HTH,
Paul F.
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Posted by maurice on August 21, 2007, 6:19 pm
Obviously there's more than meets the eye here.
I'm guessng that 2 2x10s will do it, and 2 2x12s will be even better,
but I'm going to bring some drawings down to the city and have their
engineer sign off on it. I'll update the group once I have some
direction one way or another. Thanks again for all of the advice.
Maurice
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Posted by maurice on September 21, 2007, 12:45 am
> Obviously there's more than meets the eye here.
>
> I'm guessng that 2 2x10s will do it, and 2 2x12s will be even better,
> but I'm going to bring some drawings down to the city and have their
> engineer sign off on it. I'll update the group once I have some
> direction one way or another. Thanks again for all of the advice.
>
> Maurice
Just fyi, I had an engineer look at the drawings, the 2x10s (2 of
them, laminated together with a sandwiched 1/2 plywood layer) was more
than enough.
Thanks for all the help!
Maurice
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