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Load bearing interior wall under truss roof?

34K views 22 replies 9 participants last post by  B.Johnson  
#1 ·
Hey all. The scenario here is I have a client/family member who wants an 8 ft opening cut in the wall between dining room and living room to open it up. It’s a small house so she doesn’t want to remove the whole thing and lose the room separation. This wall runs perpendicular to the truss system just off center. The trusses span 30 ft and are a w truss system built of 2x4. House built in early 70s, single story on slab. The trusses are all the same. That center wall runs about 20 ft with 2 doorways in it. It then hits a hall area where the perpendicular walls jump to 5 ft off center on each side for a 6 ft run and then back to a slightly different just off center wall for another 10is ft. The bottom cord of the truss is spliced on center and they are single nailed into the top plate.

The proposed removal would be about 18 inches off the exterior wall and leave 18 inches befor the first doorway. So my question is multi level. Is this likely a load bearing wall? And if I can’t clearly state it’s not and since would only remove 6 studs from that wall does skipping the engineer and putting a header in make sense? It’s not easy to get an engineer willing to do small jobs like this where I am . I’d rather not pay an engineer to have to put a header in anyway? Thanks!
 
#2 ·
Trusses are complex. Some have bearing points, some don't. The only one who knows is the manufacturer.

Around here, we would get called for nailing into the top plate. We're supposed to use truss clips.

The fact of it being nailed doesn't mean it's a load bearing wall or not. Maybe someone just did it wrong.

If some dude who calls himself "Seven-Delta-FortyOne" on an internet forum told you, "Oh, yeah, just chop that sumbich out", would you do it?? :eek: :blink:

Just have an Engineer look at it. Or contact the manufacturer, if they are still around.




Delta
 
#3 · (Edited)
Photograph the trusses, draw them to scale, take the pictures and elevation plan of the trusses to a reseller (lumberyard) and ask would a NEW truss like that be a "clear span" design, if yes you can remove the wall, use floating/slotted clips between the top plate and truss bottom cord to reduce drywall cracking.

The halfway splice is two pressed nail plates? Not a lapped 2x4s....

It is time to start learning how houses don't fall over. IMHO

Would you start poking around in an I.E.D in your driveway, or call a Pro?
 
#4 ·
I know trusses can be complex. I’m not gonna make a decision based solely on this conversation of course. It’s honestly hard to get an engineer to take a job this small in my area.
Yes dual plated splices not lapped.
I don’t think any used clips in the early 70s did they? I’ve seen guys just recently nail instead of clip but I’m in the southeast so...
 
#8 ·
Medeek could answer this, but I don't see him around these days.

This can't be answered without load and pitch information. Just for your own interest, take a look at clear span w trusses that fit the pitch, span, and load.

Are there ones made of 2X4s that will clear span 30'? Yes.

I'd put in a header.
 
#10 · (Edited)
Just for good measure, Ijunped over to Medeek Design and used his online truss calculator. You might want to try googling Medeek truss calculator, and put the correct information in. The results I came up with used stud grade for web, and select structural for the top and bottom cords.

In any event, his calculator tells you exactly what information goes into the design.
 
#18 ·
B. Johnson got it right.

If all the trusses are identical, they can't be load bearing with walls in three different spots...

Did you compare the picture of the trusses with a currently available, 30' clear span W truss?, without the energy "heel" for added insulation...

Installing an unneeded header, could actually CREATE drywall cracking.