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Remove 13 ft. bearing wall - Beam choices?

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Remove 13 ft. bearing wall - Beam choices? Bill 04-24-2008
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Posted by Wayne Whitney on April 24, 2008, 1:13 pm

>
> > Set your beam in the attic space directly over the existing
> > wall. Bolt all your ceiling joist to the new beam as in the photo.
> > Tear down existing wall - nothing moves.
>
> get pro help the roof rafters MIGHT not be strong enough to take
> that added load..........

The roof rafters don't come into it--although in the photo they appear
to be right above the new beam, there is no connection between the
rafters and the new beam.

Cheers, Wayne


Posted by Robert Allison on April 24, 2008, 2:09 pm
hallerb@aol.com wrote:
>
>>you must support wall on both sides before removing.. temporary walls.
>>
>>� � You don't. �Here's the way we do
it:http://www.pbase.com/speedracer/image/2622653
>>
>>Set your beam in the attic space directly over the existing wall. �Bolt all
>>your ceiling joist to the new beam as in the photo.
>>Tear down existing wall - nothing moves.
>>
>>Dave in Houston
>
>
> get pro help the roof rafters MIGHT not be strong enough to take tha
> added load..........

Not to mention that there is an entire floor between the wall he
wants to take out and the attic.

--
Robert Allison
Rimshot, Inc.
Georgetown, TX

Posted by BobK207 on April 24, 2008, 11:02 pm
> you must support wall on both sides before removing.. temporary walls.
>
> =A0 =A0 You don't. =A0Here's the way we do it:http://www.pbase.com/speedra=
cer/image/2622653
>
> Set your beam in the attic space directly over the existing wall. =A0Bolt =
all
> your ceiling joist to the new beam as in the photo.
> Tear down existing wall - nothing moves.
>
> Dave in Houston

Dave-

That is a pretty cool design concept to replace a wall with a beam.

But the joists will move downward until the beam deflects enough to
take the load that the wall was supporting.....depending on the beam
sizing & the ceiling load (actually in this case, the 2nd story floor
& ?). The deflection at mid span could be in the 3/8 to 1/2" range.

Plus in the OP's I'm pretty sure that your concept would place the
beam on the floor of the 2nd story.

But still a neat concept.

cheers
Bob


Posted by Wayne Whitney on April 24, 2008, 11:12 pm

> But the joists will move downward until the beam deflects enough to
> take the load that the wall was supporting.....depending on the beam
> sizing & the ceiling load (actually in this case, the 2nd story
> floor & ?). The deflection at mid span could be in the 3/8 to 1/2"
> range.

This could be addressed by using a pre-cambered beam, like a glulam.

Cheers, Wayne

Posted by Bobk207 on April 25, 2008, 10:33 am
>
> > But the joists will move downward until the beam deflects enough to
> > take the load that the wall was supporting.....depending on the beam
> > sizing & the ceiling load (actually in this case, the 2nd story
> > floor & ?). =A0The deflection at mid span could be in the 3/8 to 1/2"
> > range.
>
> This could be addressed by using a pre-cambered beam, like a glulam.
>
> Cheers, Wayne

Wayne-

Yes, the beam, if cambered properly, would deflect to a straight
condition.

But the ceiling / 2nd story floor would have to be jacked along with
the beam for the entire system to have no deflection....you would need
to enforce displacement compatibility (& a raised starting point) to
prevent a sag when the walls were removed.

It's kinda like getting a sistered joist to really share the load.

cheers
Bob

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