Continuous Bearing Truss ( Floor)

[kunni]

I am looking for some information on floor knee walls (continuous bearing truss) at exterior walls. Spacing of the studs and so on. Any information is greatly appreciated.
kunni

 

[jhoulette]

It just depends on the loads you are supporting. Typically matching the stud spacing. Also, keep in mind spacing needed for any siding attachments.
Blocking and bracing for lateral forces is of course needed as well.

Jim Houlette PE
Web:

http://www.evstudio.us

Online Magazine:

http://www.evstudio.info

 

[msquared48]

Why would you need to rest a truss on a parallel exterior bearing wall? Are you looking to minimize differential deflections? Are you really using trusses, or joists?

Seems like a framed pony or full height stud wall would suffice.

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

 

[kunni]

Thanks for the input

jhoulette: Typically the floor truss press cannot go over 3 1/2"; so what if the exterior wall is 2X6 @ 16" O.C. studs? Just matching the 16" O.C. studs on your continuous bearing truss (2X4)will suffice?

msquared: If you have units next to each other and the unit seperation wall is load bearing and the trusses are running width wise, you will need a CB(continuous bearing) truss or knee wall on the exterior wall. Normally GC uses pre-cut studs to frame the wall, so building a full height wall is not used for economic reasons.

Is there any codes or literaturs or information on the stud spacing? If the exterior wall is 2X6 @ 16" O.C. and if it is a 3 floor apt. building.

 

[jhoulette]

Right, 3 1/2" wide. The floor truss at the exterior wall can still be 2x4 even with 2x6 studs above and below. With the short height, the 2x4s of the truss have a higher capacity.
With high loads bearing area tends to control. Squash blocks can then be used to increase bearing area at point loads.

I'm not aware of any specific codes or literature. Just the typical NDS wood code. I'm sure there is something from APA floating around.

Jim Houlette PE
Web:

http://www.evstudio.us

Online Magazine:

http://www.evstudio.info