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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
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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
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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
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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
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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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