I'm working on a project to replace the monoflow piping in my basement, which connects to in-wall convector units with finned tube copper in each room of the house. I'm planning on replacing the copper piping and the zone controls currently in multiple locations with 1/2" PEX home runs to a manifold next to my boiler in the basement. Because of where the boiler is located and because the manifold will basically be branching out to every room in my house, I will have a few places in the floor joists nearest the manifold where I will need to drill a number of holes (6-8 sets of supply and return so 12-14 PEX runs total) before the runs start turning off in different directions to go up into the rooms. Running the PEX underneath the joists isn't a preferred option because I'll be finishing the basement ceiling.
I'm aware of the guidelines/code requirements for drilling floor joists, but is there any reason for concern about the total number of holes in the same area if those guidelines are followed? For example, could I have two rows of 6 or 8 holes on top of each other if the holes are spaced out 2" from one another? Or is there a concern with having just too many holes in one area, even if the holes are all in the middle part of the joist and slightly separated from one another?
I'm aware of the guidelines/code requirements for drilling floor joists, but is there any reason for concern about the total number of holes in the same area if those guidelines are followed? For example, could I have two rows of 6 or 8 holes on top of each other if the holes are spaced out 2" from one another? Or is there a concern with having just too many holes in one area, even if the holes are all in the middle part of the joist and slightly separated from one another?