I was asked to analyze a series of floor joists that have multiple holes. The code does not address how many holes can be installed next to each other. In this case I think a minimum spacing of 4inches is required to prevent splitting. I am trying to find a reference regarding this concern. Thank you for your help
This is what I got from the client.
1. Joists are DF#2
2. Hole diameter 1-1/2"
3. Distance between two consecutive hole is 2"
4. Joists are 2x10