beam deflection in a two story renovation
beam deflection in a two story renovation
(OP)
I would like to get input on what to do about beam deflection for a new 24' beam that will serve as a header for a sliding door on the first floor of a two story renovation project.
My concern is that if the beam is ordered with camber in the beam that they camber will crack the wall and disrupt the doors and windows in the walls above the beam when the beam is raised into position.
If the beam is ordered without the camber (flat) then I have the same concern that when the shoring is removed that the wall will settle into the deflection causing cracks in the wall and the doors and windows in the walls to not function.
The beam is going in an exterior wall carrying roof and floor loads front above.
I would like to find our how other people have handled this situation and what solutions have worked for them.
Thank you
My concern is that if the beam is ordered with camber in the beam that they camber will crack the wall and disrupt the doors and windows in the walls above the beam when the beam is raised into position.
If the beam is ordered without the camber (flat) then I have the same concern that when the shoring is removed that the wall will settle into the deflection causing cracks in the wall and the doors and windows in the walls to not function.
The beam is going in an exterior wall carrying roof and floor loads front above.
I would like to find our how other people have handled this situation and what solutions have worked for them.
Thank you





RE: beam deflection in a two story renovation
If you need less deflection, increase the moment of inertia or modulus of elasticity of your member.
RE: beam deflection in a two story renovation
Thanks for your response.
The situation that I am dealing with in this renovation is that we need a very shallow beam, something in the neighborhood of a W12x58. We are trying to keep the bean shallow so the doors under it can be as tall as possible.
With the W12x58 the total (live and dead loads) deflection calcs out at .7" which would be a lot of sag for the wall above that it is supporting. I am trying to understand how other people have dealt with this situation in other renovations. I could keep increasing the weight of the beam but even with a W12x136 there is still some deflection. I would like to know how other people deal with that deflection.
Thanks
RE: beam deflection in a two story renovation
RE: beam deflection in a two story renovation
Mike McCann
MMC Engineering
RE: beam deflection in a two story renovation
- make a rally cool hidden truss in the exterior wall above
- add intermediate beams like M^2 suggests
- Install a deeper beam that will stick above the floor. Lots of reframing, etc.
If the view is more important than the money any of the above are possible. You can't get long openings with shallow headers and no deflection. You can get (2) of the (3), but not all (3).
RE: beam deflection in a two story renovation
Who is bringing the beer?
RE: beam deflection in a two story renovation
Make sure the bottom of the deflected beam and the door frame have clearance.
RE: beam deflection in a two story renovation
RE: beam deflection in a two story renovation
The idea, whether you camber or not, is to drop the DL onto the beam before you instal the doors, that way you only have LL deflection to worry about.
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: beam deflection in a two story renovation
RE: beam deflection in a two story renovation
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: beam deflection in a two story renovation
It's an option for sure, I just forsee the member size being much too large to be functional. But might be worth checking out.