Floor trusses and interior walls.

[padroo]

It's kind of late now but my house is built with 34 and 36 foot floor trusses, free span one foot on center with 3/4 inch OSB nailed and glued sub flooring. I also have roof 2 X 4 roof trusses on 2 foot centers. There are no load bearing interior walls with freespan trusses.

I have a lot of noise when the temperature changes I believe coming from the interior walls at the floor making a popping sound. It is really loud, as you walk or sometimes it's just the temperature change. Truss floor systems have a lot of movement in them and I would like to know how interior walls are suppose to be attached to keep this from happening.

Floor trusses make a beautiful finished basement but I wouldn't do them again.

 

[DougWil]

The sole plate of the interior wall is just nailed down to the trusses.

The top plates should have a slotted simpson type connector to allow the floor or roof truss to deflect w/o bearing on the wall below.
However with much deflection you will get cracked finishes at the wall/ceiling corner

 

[pstnbly]

The cracking noises are from the nails in the sole plates sliding through the wood as you walk. In a few homes with this issue I have been able to locate the wall from below and screw to the sole plate with a deck screw. The reason the nails slide in the plate is due to the drying of the wood post construction causing shrinkage and taking the tension off the nail.

 

[Orionrising]

From my understanding floor trusses are different then roof trusses in that interior walls can be attached to them directly and basically reduce the span vs roof trusses where it interferes with the function of the truss.

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[DougWil]

From my understanding floor trusses are different then roof trusses in that interior walls can be attached to them directly and basically reduce the span vs roof trusses where it interferes with the function of the truss.

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If it is a true truss not a TJI type, bearing points and spans have to be designed and you can't just move bearing points around.

As with our roof trusses, all of our floor trusses are individually engineered to meet the specifications of each building design. This allows for the most cost effective designs to meet the needs of the structure.
http://truswood.com/floor trusses.htm

That said, Code required floor lives and dead loads are relatively small, and most homes would never see that level of load so you can get away with it without failure.

 

[sberry]

They are joists in the floor.

 

[padroo]

Under the bedroom end of the house in the basement I made two walk in closets down the center of the house and the sole plates are anchored to the floor but the top plate is only shimmed.
Large temperature changes and humidity really make a difference in how much noise they make.
This time of year you have warm days and cold nights.
Roof trusses move a lot in the winter because the lower chord is buried in insulation and the top is in frigid air. The middle of the house has 40 foot trusses cantilevered out over my front porch. Luckily that area is the kitchen dining room and living room so there are now partition walls in that area of the house.