engineered trussed over interior wall

These engineered trussed are over an interior wall that a client is asking if the wall below the center of these trusses can be removed. As you can see in the pic the trusses are of different types. I just want to check with everyone to see if anyone feels there is any issue with removing the wall below with these type of trusses. Thanks.

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PICT0305 (Small).JPG

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What is under the wall?

Why would trusses effect anything below.
They are there to hold the roof.

Does the wall support the trusses?

It depends on the design criteria. There is more than one style/design of thruss there and it appears that some web members are missing.

Call in a structural CET familiar with truss design…shouldn’t need a civil P.Eng.

Floor joists running in the same direction of the wall (not doubled up under the wall). My concern is there is two types of trusses in the pic. Some (in the front) have vertical members in the center of the truss above the interior wall.

Thats the million dollar question :slight_smile:

Does the wall support the trusses?

If there are web members missing from the truss/es where the wall is to be removed, the wall may now be giving partial support to the bottom chord/s, strapping and ceiling drywall. Removing the wall in this case may allow sag to occur which could be quite serious if you’re in a high snow load area of BC.

I dont believe any webs are missing, I believe they are two different types of trusses.

Look at your 1st picture…the 5th truss in.

On the right there is a web member (coming down from the ridge on an angle), on the left one is missing.

I agree Larry, those trusses have been altered or modified for a reason.
The is a variety here of a King post truss, A Queen Post Fan Truss, and A Fink (W) Truss.
Some are missing chords. The King post is only good for a 16’ span also. :slight_smile:

Great info, thanks for all your help! I can always rely on the best :wink:


Just by your pictures the three different styles of trusses pointed out by Marcel indicates there could be three different spans or different loadings or maybe the builder worked for a truss company and got free leftovers… In any case you would have to start at the roof and follow the load path down to the ground for each truss. The kingpost trusses, closest in the picture, gives me the most concern, I would start with them. One word of caution you are way outside the SOP so any advice you give will put you personally at risk and your insurance company will not cover you.

Thanks, I referred it to a specialist for further investigation prior to any modifications and or to ensure conventional future performance under and including live loads.

Good question Mark!

Usually, trusses are same which make it easier to determine if support wall can be removed.

Refering to a specilast is certainly the way to go if the construction documents are not available for review but just for a heads up. If the span requires mid support the truss design will always have webs that fall over that mid point bearing to transfer the load