Unsupported partition walls?

[drile007]

I'm wondering how to deal with unsupported partition wood-frame wall which lie parallel to wood joist floor system direction?
1) Capture its load with every joist in that floor system with additional area dead load on entire floor.
2) Take its whole load on a single joist?

Thank you in advance

 

[msquared48]

Use Simpson DTC clips, or some similar product to allow the joists above to deflect vertically without vertically loading the partition wall. The clips also laterally stabalize the top of the partition wall. They can also allow some lateral load to be transmitted to the wall if it is a shear wall.

If the partition wall does not aligy with the joists above, 2X flat blocking can be placed between the joists above at the top of the partition wall to nail the clips DTC to.

The Simpson manual shows how to install the clips. There must be a 1/4" gap between the top plate of the partition wall and the bottom of the joists above. The same detail can be used if the joists above are roof trusses.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[drile007]

msquared48:
Misunderstanding, I mean the wall above the joist (not under).

 

[msquared48]

OK.

If the partition wall extends 1/2 or more of the joist span, then doubing up on the floor joist directly under the partition wall is all that is needed. Otherwise, a single floor joist is sufficient.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[drile007]

You probably mean doubling?

 

[msquared48]

Yup. Sorry. I tipe to fazt.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[rscassar]

It is interesting that Simpson provide a lateral force which can be transferred into bracing walls for the DTC clips. Albeit a very small force.