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rlc2052 12-12-2007 01:14 PM

Open Joist. Is this safe??
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I was inspecting my house to see what kind of load bearing my floors could take. I have an open joist system that uses 11.75" joists with 24" in-between them. When building the house, the contractor connected the joist to the wall by cutting back the bottom 2X4 so that it does not connect to the cinder block wall. Only the top 2X4 goes into the cinder block. :eek:
How bad is this, and how can I support this better?


ToolGuy 12-12-2007 01:40 PM

Wow! :eek:

That is one seriously butchered joist, and you say they are all like that??? You're right, that lower part of the joist needs to be supported. Off the top of my head I'd think maybe using steel brackets under the joist and attached to the cinder block with tapcons or other sort of anchors.

Give it some time here and see what others have to say. I'm guessing you'll get plenty of ideas from other members, not to mention plenty of :eek:s.

rlc2052 12-12-2007 04:58 PM

Thanks ToolGuy.
Yeah they are all like this, and it is a 3 story townhouse. This is the only exposed part that is behind the fire place. The rest is behind sheet rock.

ToolGuy 12-12-2007 05:05 PM

Did you buy the house new? I'm wondering because the builder may be liable for the repair.

rlc2052 12-12-2007 05:36 PM

No, it is about 15 years old. I bought it about 3 months ago.

inspectorD 12-12-2007 06:03 PM

Slow down there speedy...
Those look like top loaded truss joists...old style. These are just fine. The weight is on the top cord,and the metal part in between is the cross section web. No support is needed under the bottom. In fact if you support the bottom you CHANGE the engineered truss. This is typical of townhouses.
If you have any doubt, contact a structural engineer and they will tell you the same thing.:)

rlc2052 12-12-2007 07:31 PM

Thanks Inspector D
This seems like it will really affect the load bearing capacity of my floors though. Do you have any idea of what psf load these could take? I can only find load bearing formulas for newer joists that connect at the bottom.

ToolGuy 12-12-2007 11:30 PM

Oopsie, hope you didn't rip out those walls yet. :o

inspectorD 12-14-2007 07:29 PM

Hi rlc
Your truss capacity is fine, If you want to you can ask the local building dept if they still have your building on record for the PSF loads.
Then you can see from your dept what the capacities are. They are different around the country because of wind, snow, seismic and size of building. If you are over 3 stories tall you follow a separate set of building specifications.
But since the whole development has not fallen should:) be OK.

And as for you Tool guy....:D , We all want to help...that is why we are here, to watch out for each other.;)

ToolGuy 12-15-2007 10:58 AM

I just realized how much that smiley looks a lot like me. :o

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