Invisi-Truss?

[rwilcox]

Another fine truss field modification or is this a new invisible truss that goes right thru cinderblock walls!

[Larry D. Kage]

Some floor trusses are engineered to bear on the top cord area with the bottom cord notchable to a certain point.

[phinsperger]

I don't see the problem.

[rwand1]

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.

[Michael Larson]

Take a look.



http://www.mii.com/artefact/download.asp?aid=26376

[rwand1]

http://www.sbcindustry.com/bcsi.php

http://www.sbcindustry.com/images/pu...295m2tdlmqdq87

[phinsperger]

How does this differ from steel trusses that do not require the bottom cord to be on a bearing?

[rwand1]

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.

[phinsperger]

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.

[gbeaumont]

Hi to all,

here's a couple of top chord bearing details if it helps anyone

Regards

Gerry

[Dale Duffy]

Originally Posted by gbeaumont

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.

[rwand1]

We are not talking commercial, we are talking residential.

[gbeaumont]

Originally Posted by rwand1

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

[Greg Veal]

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.

[Larry D. Kage]

Originally Posted by gbeaumont

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

Same here.