Another fine truss field modification or is this a new invisible truss that goes right thru cinderblock walls!
Some floor trusses are engineered to bear on the top cord area with the bottom cord notchable to a certain point.
I don’t see the problem.
The bottom cord is not bearing. The truss will be suseptible to flex. Even if the bottom cord enters the concrete block its still wrong.
http://www.sbcindustry.com/bcsi.php
http://www.sbcindustry.com/images/publication_images/b7.pdf?PHPSESSID=2jiqa3gsfp0u295m2tdlmqdq87
How does this differ from steel trusses that do not require the bottom cord to be on a bearing?
From the links above it depends on the manufacturer.
But the jpeg Randy posted shows this to be a top bearing cord. There is a vertical section missing at the wall running from the bottom cord to the top cord.
I guess your right Raymond, it will depend on the maufacturer. With the one you showed in your links has the vertical piece one at the very end were as Randy’s pic shows a vertical member 1/2 web (approx 1 foot) from the end that your manufacturer does not. Also Randy’s does not have the other diagonal peice that your does. I don’t think from an engieering standpoint the two can be compared.Randy, was there any stamps that you could see.
Hi to all,
here’s a couple of top chord bearing details if it helps anyone
Regards
Gerry
Exactly Gerry…I see them all the time in Commercial buildings, top bearing.
We are not talking commercial, we are talking residential.
Raymond, I have commonly seen these used as floor & roof trusses on residential structures, I also agree with Dale they are very common in commercial structures.
Regards
Gerry
Raymond,
I have looked at your pics and have my concerns as well. I would call for a structual inspection (either S/E or Manuf. Rep.) to visually inspect and sign off, as installed.
Gerry is correct, but look at his diagrams and compare to your pics for beefed-up top cord support.
You’ll see this design in Comm. Applications, but in my area, those trusses are usually steel, not always, just usually.
You pics are not at the best angle to get a true view of the ends of the trusses, but could you tell if the were cut or finished that way. Have you noted the Manuf’s stamp (ie: origin, dates, lot #, etc) to check further.
Good Question, some interesting answers.
Same here.
I did some enhancing and notes on Randy’s pic. Maybe he has more pics to help clarify this. I think I have changed my oringinal conclusion. These trusses don not appear to be correct. More pics might help.
Here is a couple pictures from a building a couple years ago, nothing wrong.
There is a difference in the cord layout from Randy’s initial picture. Randy’s pictures show the cords on their sides, while Dales pic’s the cords are on their vertical plane, if that makes sense? Either way it seems that these trusses are both in use.
I agree … for top bearing wood floor trusses there should usually be a beefed up top cord at the bearing (steel is a completely different story). Take a look at typical truss manufacturer’s details and the WTCA standard details.
JMO
Here is another version of top Chord Bearing with no additional reiforcement.
Marcel
