Floor Joists Under Walls


SNestor
 Share

Recommended Posts

Is there a way to control whether Chief draws a floor joist under a wall?  I have the spacing set to 24" oc...and everywhere there is a wall above that is parallel with the joists...Chief seems to double up the floor joists.  

 

Just wondering if there is a control somewhere that determines this...

 

thanks!

 

          5a99b2874934e_joistlayout1.thumb.png.fc9a3ea148e7d46f67c87476d64ca330.png

Link to comment
Share on other sites

This is one of my biggest pet peeves about Chief's auto floor framing and I don't believe there's any way of controlling it.  If somebody could show me otherwise, I would be stoked.  I think the 2 best options are manually deleting after framing or temporarily changing interior walls to invisible, framing, and then changing walls back.

Link to comment
Share on other sites

15 minutes ago, Alaskan_Son said:

This is one of my biggest pet peeves about Chief's auto floor framing and I don't believe there's any way of controlling it.  If somebody could show me otherwise, I would be stoked.  I think the 2 best options are manually deleting after framing or temporarily changing interior walls to invisible, framing, and then changing walls back.

 

OK...thanks for the info Michael. 

Link to comment
Share on other sites

4 hours ago, SNestor said:

Is there a way to control whether Chief draws a floor joist under a wall?  I have the spacing set to 24" oc...and everywhere there is a wall above that is parallel with the joists...Chief seems to double up the floor joists.  

 

Just wondering if there is a control somewhere that determines this...

 

thanks!

 

          5a99b2874934e_joistlayout1.thumb.png.fc9a3ea148e7d46f67c87476d64ca330.png

 

I wish we could control this.  I have sent this request in the past.  

 

It it seems like sometimes they get doubled up and sometimes not.

 

i am referring to non-bearing partitions.

  • Upvote 1
Link to comment
Share on other sites

Richard, we have the same rule, it's the nation wide code requirement.

R502.4 Joists under bearing partitions.
Joists under parallel bearing partitions shall be of adequate size to support the load.
Double joists, sized to adequately support the load, that are separated to permit the
installation of piping or vents shall be full depth solid blocked with lumber not less
than 2"  in nominal thickness spaced not more than 4' on center. Bearing partitions perpendicular to joists shall not be offset from supporting
girders, walls or partitions more than the joist depth unless such joists are of sufficient
size to carry the additional load.

Link to comment
Share on other sites

1 hour ago, dshall said:

We use a lot of trusses so many interior walls are non-bearing,  those are the walls that I would rather not have double jets under.

I will run into trusses about 30% of the time, mostly conventional for me. Any bearing walls on the 2nd and above floors will usually have beams under

Link to comment
Share on other sites

This past weekend I walked through 4 homes under construction here in beautiful Westfield, Indiana.  The floor system used n each home was I-Joists.  No conventional 2x10's to be seen...looks like that method of construction has finally been banished...at least in high priced homes.  The homes I walked were all large and will probably sell for a million dollars or more...the lots in this subdivision sell for anywhere from 150K to 250K.  For you California guys...this is a high priced home in Indiana...these homes will all be over 6,000 sf with full basements and very high quality finishes.  

 

All but one home used roof trusses...so, interior load bearing walls were mostly non-existent...except for the home with the conventionally framed roof.  In all of the homes there wasn't a single case where I saw an I-Joist located beneath a wall above.  In fact...it appeared to me that the joists were deliberately spaced to make sure there wasn't an I-joist under a wall.  The spans were long in all cases...and the I-Joists were spaced 16" oc.  

 

Honestly...I'm not sure what our code requires here in Indiana...I can attest to the fact that code compliance for single family construction is not as restrictive as some states...such as sunny California.  That said, I'm not sure what good it would do to place an I-Joist under a non-load bearing wall.  The only thing I can see happening is an electrician or a plumber drilling out the top chord to get his work done.  (apology would come later in the day...I'm sure).  

 

I also think that the lumber dealers here in central Indiana engineer the floors...and most likely even get the design stamped by an engineer.  I believe I-Joist blocking is placed (and specified) for all point loads.   

 

As for Chief...I wish the software would just space the joists as specified...and let us manually place double joists as needed.  But...I also want the stair tool improved.  Looks like we will be waiting on both "wishes" for a bit longer.  :wacko:

Link to comment
Share on other sites

What about the weight of the wall and the studs? Floor systems are designed for a uniform load. A wall above, even if it is parallel to the joist would

add a concentrated load to that joist and may require it to be doubled depending on what the wall is made up from and what is attached to it. (cabinets maybe)

I think the feature is a good reminder and if a particular joist is not needed than just delete it. Just my two cents worth, Bob

  • Upvote 1
Link to comment
Share on other sites

At 90 to 110 PLF for nonbearing walls I only add some crossing members when they run parallel to the joist.

I see in the field the frames rarely add the crossing support under them. It appears the 3/4" plywood is stiff enough to carry that load.

Link to comment
Share on other sites

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
 Share

  • Member Statistics

    30642
    Total Members
    9156
    Most Online
    oppguenard1
    Newest Member
    oppguenard1
    Joined
  • Similar Content

    • By BlackDiamond
      I'm stumped....
       
      I am working on a 4-plex on a sloped site so the floor levels of each unit are different. On the left end unit, when I try to change my standard basement floor level from -119 5/8" to -95 5/8" it works in all the 'rooms' but won't stay changed in the 1/2" space between the firring walls and the foundation walls. I've tried changing a firred wall to have no room definition so it included the 1/2" space but then the whole room goes back to the -199 5/8". I've tried everything I can think of and it just won't stay at -95 5/8".
       
      I've moved the footings up to the proper location but as you can see in the .pdf view, the windows are 24" too low and the slab in that 1/2" space is 24" too low. I can't seem to figure out how to get it to appear accurately. I've included the plan file just in case. I'd appreciate any ideas.
       
      Thanks
       
      btw... I'm using CA Premier X12
       
        firred space floor.pdf
      Building 16-50 51 52 53.zip
    • By BenPalmer
      about a year ago, with an X12 updates, thick wall connections (anything over 8" thick) became unstable...especially when 3 walls intersect.
       
      I'm attaching an X12 plan that demonstrates several issues I'm having.  Curious if others see the same behavior.  notes within the plan describing the behaviors
       
      I realize that layered walls will likely fix much of this but I do not like layered walls....they have a whole set of issues that I don't want to get into the pros and cons.  again, this worked fine before, but broke with an X12 update and is still broken in X13 beta.
       
      Appreciate everyone's input.
      wallConnectionProblems.plan
    • By Makerer
      I changed the defaults for the Glass Pony Wall and I would now like to change them back to their original defaults, but I don't recall the original settings. Is there an easy way to do this?
    • By ChiefRosieRue
      I'm a relatively new user and am working my way through the Bachelor View project after the Chic Cottage project disappeared. I'm at video 6, "Creating Rooms and Defining the Ceilings" but I noticed something funky going on with some of my walls from the foundation/basement showing up on the first floor. I'm sure part of the issue is that some of my wall heights/foundation/stem walls are off, but the videos don't show what my defaults should be set to. Any advice would be greatly appreciated!
      Thank you! 

    • By Jackstacey
      I'm having issues getting two joining external walls to have different materials and meet on the external corner ( pebble dash and brick) . I've checked my intersections and their mitered correctly and if i select ' through end/start' in structural for the wall it just shifts the issue to the adjoining wall. Please help?