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Notching on bottom flange TJI


Dudley Wong's Avatar
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10-19-16, 06:50 AM   #1  
Notching on bottom flange TJI

I have a 14" TJI spanning 19' on 16" centers and need to notch the bottom flange. Notch size is very small. Appx 1" in length and 1/4-3/8" depth. The notch will be appx 2' from the end of the truss. Will I be ok?

 
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10-19-16, 07:46 AM   #2  
What are the TJI's supporting? That's a small notch, and near the end is better than in the middle, but never a good idea to notch the flange. Can you reinforce the web from the load bearing end out past the notch by sistering it with two lengths of plywood?


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10-19-16, 08:00 AM   #3  
There is a living space above. I had a 2-post lift installed and the lift was higher than the ceiling in the garage by 1". So we cut the drywall. However, the corner of the lift is touching the bottom flange of a j-joist. I wanted to notch to get keep vibrations from traveling upstairs.

 
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10-19-16, 09:42 AM   #4  
How about using a piece of rubber at that point ?


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10-19-16, 07:58 PM   #5  
Well, I am also worried their might be some movement when lifting heavier vehicles and did not want to flex the the floor joist and drywall.

 
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10-20-16, 03:21 AM   #6  
TJI instructions do not allow for the modification of their I joists, especially on the bottom chord. Can't you move your lift to one side by 3 1/2", thereby missing the TJI?? With a lift system in place, you do risk movement of the I joist, and severe shift, so I would avoid ANY contact between the two.

 
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10-20-16, 06:15 AM   #7  
Moving the lift a 1/2" or so is not a good option since the anchor bolts are already drilled. However, I went up got a better view and I may not need to notch the whole flange, just 1/4" inch or so.

Besides, there is knot there that probably does not provide much tensile strength?

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Last edited by PJmax; 10-20-16 at 11:28 AM. Reason: reoriented pictures
 
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