Any engineer or builders know what this truss will support?

[lakeroadster]

Using stick frame construction structural techniques on a pole building seems haphazard, IMO.

Any modifications made are monies that could otherwise have been spent having what is already there evaluated.

There is no reason to believe what is already there isn't sufficient... it just needs evaluated.

 

[bczygan]

I wouldn't bother with making a truss like you have there, I'd just put rafters in to support the 2x6 purlins that are there. Use a collar tie at the 1/3 point of the rafter height. Or, if you were willing to put up with the bottom chord of a truss anyway, put in a ceiling joist at the bottom of the rafters.

The right solution? Not really. But, it will add strength beyond what you have now, so it is definitely bettering the situation. It will also be a lot easier to add rafters than make a truss and install it.

The truss really only is useful in that it is bolted to the moment resisting posts of the pole barn construction. Making a similar truss that sits on a 2x4 wall would be overkill for what the wall could support.

What this solution does is assume that the existing structure is currently adequate, particularly in keeping the outside walls from spreading apart under roof load. The additional rafters will just take some of the load from between the truss and ends, and spread it to your 2x4 walls. If they start to deflect, the load will be picked up by the 2x6 purlins and transferred to the truss, just like it was originally. But, any load that is carried by the rafters will not be going to the truss, so it will be less loading than before modification. So, your roof safety increases.

This is the method I would use.

 

[cthulu]

I took a combination of everyone's advice on this one.

There is a 2x4 stick wall screwed into the horizontal supports with 4.5in long screws and is boxed with the side beams fastened to the 6x6 posts.


There is a double layer of rigid foam insulation, 2in and 2.5 inches and the exterior is 5/8 firecode sheetrock.

The truss is similar to the middle one, but with 2x10 instead of 2x12. To get tension on the roof I jacked the truss up till the roof slightly bowed. This was done with three basement jacks under each support point. Then the whole thing was bolted together, my measurements appear to have been good so it is at the same height as the middle truss.

One more to go on the other side, then some 2x4's between everything with insulation on top and sheetrock on the bottom.

 

[cthulu]

Made some more progress, half the ceiling in and insulated with 5inches of 30psi foam for an R value of 30. Starting on the second truss this weekend then tackling insulating around/over the garage doors.

 

[rburke65]

Yes the trusses look home made. Yes you need a better electrican.....or how about AN electrician. !!! And it's not usually called shop liner, but a ceiling liner or metal liner. Screw it down....UP actually.....and your done!

 

[cthulu]

rest of the ceiling is in and insulated along with a drop ladder to the attic.

 

[cthulu]

Update, 5/8 firecore drywall is up and mudded/taped/primed/painted starting on putting the garage doors backup and running the EMT everywhere.