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Beam replacement question Mark G. 09-14-2007
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Posted by Mark G. on September 14, 2007, 7:32 pm
Good afternoon.

I may need to replace a beam that supports a load running parallel to the
beam (loadbearing wall on the floor above.) What is the technique to support
the load under this circumstance? It's simple when the load runs
perpendicular to the beam, but I can't visualize how to do it when the load
runs parallel to the beam.

Thanks
-Mark




Posted by marson on September 14, 2007, 10:37 pm
> Good afternoon.
>
> I may need to replace a beam that supports a load running parallel to the
> beam (loadbearing wall on the floor above.) What is the technique to support
> the load under this circumstance? It's simple when the load runs
> perpendicular to the beam, but I can't visualize how to do it when the load
> runs parallel to the beam.
>
> Thanks
> -Mark

You really need to provide some more information to answer this one.
I take it the beam is part of the floor system. How much weight?
What is the span? What would happen if you just went and pulled the
beam--certain collapse? Is this a completed structure or is it being
framed? If walls above are sheathed and the structure isn't loaded
with snow or whatever, you can be fairly casual about temporary
bracing. But obviously you are going to have to use some judgement.
If there is a layer of plywood between the beam and the wall, you
might be able to wedge in a number of 2x's in pairs that run at
opposing angles down to the floor below. You could toenail them to the
plywood just shy of the existing beam. But send us a pic if you
really want any useful advice.


Posted by Mark G. on September 15, 2007, 12:00 pm
>
> You really need to provide some more information to answer this one.
> I take it the beam is part of the floor system. How much weight?
> What is the span? What would happen if you just went and pulled the
> beam--certain collapse? Is this a completed structure or is it being
> framed?

Old house (1930). Beam span is 14'. Current beam is a doubled 2x10
joist and exhibits some sagging.Walls above are plastered.
Removing the beam would result in extensive damage and possible
collapse, as the wall above the beam carries second floor load.

> If there is a layer of plywood between the beam and the wall, you
> might be able to wedge in a number of 2x's in pairs that run at
> opposing angles down to the floor below.

There is shiplap subflooring between the beam and the wall above.
Perhaps this could carry the shear load temporarily if I were to support
the subfloor on either side of the beam during replacement?



Posted by DanG on September 15, 2007, 6:02 pm
If the existing is not rotted or hurt, how about reinforcing it
without removing it? It would be fairly straight forward to take
out the sag with proper jacking. It might need to be done slowly
over time to prevent cracking. You could sister the flanking
joists on each side and cross block between them as you shore and
remove the existing.

Sister the existing beam with steel plate, glued plywood,
additional 2x10, or a combination of reinforcement

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



>>
>> You really need to provide some more information to answer this
>> one.
>> I take it the beam is part of the floor system. How much
>> weight?
>> What is the span? What would happen if you just went and
>> pulled the
>> beam--certain collapse? Is this a completed structure or is it
>> being
>> framed?
>
> Old house (1930). Beam span is 14'. Current beam is a doubled
> 2x10
> joist and exhibits some sagging.Walls above are plastered.
> Removing the beam would result in extensive damage and possible
> collapse, as the wall above the beam carries second floor load.
>
>> If there is a layer of plywood between the beam and the wall,
>> you
>> might be able to wedge in a number of 2x's in pairs that run at
>> opposing angles down to the floor below.
>
> There is shiplap subflooring between the beam and the wall
> above.
> Perhaps this could carry the shear load temporarily if I were to
> support
> the subfloor on either side of the beam during replacement?
>
>



Posted by Mark G. on September 15, 2007, 7:26 pm
>
> Sister the existing beam with steel plate, glued plywood, additional 2x10,
> or a combination of reinforcement

Sistering the existing beam in place could be a solution. I suppose if I
could get an engineer to specify the procedure and sign off on it, I could
go that route.



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