This week’s truss:
Question:
While the TPI Technical Advisory Committee recommends that the minimum grade of visually stress-related lumber used for truss chords should be No. 2 grade, could you hypothetically use No. 3 for either one and still perform under capacity?
Top and Bottom Chords are Southern Pine No. 2
Webs are Southern Pine No. 3
Building Code: IBC 2021
Loads (psf unless otherwise noted):
TC Live Load 40
TC Dead Load 10
BC Live Load 0
BC Dead Load 5
The answer will be posted on Thursday!
This is not a production truss! This is simply an example for Truss Tuesday conversation. Join the conversation on LinkedIn.
Updated: April 25th, 2024
Answer: T1 can be replaced with No. 3, but replacing B1 with No. 3 would cause the truss to go over capacity.