I'm considering moving the floor drain in an ongoing renovation. This would mean I have to make holes in 2 floor joists. Now I turn to you to see if it might work or if we should give up the idea of moving the shower.

The bathroom in question is 2.35x1.7 meters. The floor joists are spaced 60 cm apart. The dimension of the drain will be 75mm as it will run from the shower. To reinforce, I plan to glue-screw plywood to the floor joists before drilling holes. Also planning to add extra support throughout the bathroom with 30 cm spacing.

Each floor joist is about 2.4 meters long (dimensions 45x220) and the joints on the floor joists are reinforced with a nailed plank (dimensions 28x70 not entirely sure, might be a bit wider, writing this at work so can't measure). The joints are located on top of the inner walls on the lower floor. The hole needs to be made about 1 meter from a joint because the nailed plank and the placement of the floor drain prevent making the hole closer to the joint.

Tried to sketch how it looks today, the bathroom is in the middle of the house. In the sketch seen from above, the red circle is where the stack goes down today. The red line is where I plan to run the drain and the red filled circle is the intended position of the floor drain.

So do you think this could work?
 
  • Diagram showing floor joists layout with possible hole location 1m from joint for bathroom drain relocation. Ceiling and floor plan notes included.
  • Diagram of a bathroom layout with beams, showing the current and proposed drain positions, marked by red circles and a line indicating the new pipe route.
Don't you have the option to run the drain from the shower between the joists, and then let the pipe go UNDER the joists to the main stack? You can build in the horizontal pipe that will cross the joists if that part will be visible in the room below.
 
  • Drain pipe layout between studs showing horizontal and vertical placement for a shower system, with a pipe crossing underneath the floor joists.
The laundry room is underneath, and it would probably be possible to build the drainage into the ceiling there. Hadn't really thought in those terms before.

However, the problem is that the water pipes go up in the shaft right where this drainage pipe would connect from with this solution. And in that case, they would need to be rerouted. See the green area in the new sketch. And underneath where we are considering placing the well, there is a ventilation shaft, so unfortunately, it cannot go out that way.
 
  • Diagram showing layout for plumbing and ventilation in a laundry room, depicting red and green markings for pipe and drain placements and obstacles.
Aren't the floor beams overlapped?
With the short span and 220 mm high beams, I don't think it matters for strength to make a hole for a 75 mm drain pipe. If it feels safer, you can nail a 13 mm plywood on both sides of the hole, 60 - 70 cm long. Then the risk should be negligible that anything goes wrong.
 
No, they are not joined overlapping but all have the joint at the same place.
 
Assuming that the ends of the floor joists rest on the partition walls below. I see it as risk-free to drill.
 
Yes, the ends are on the partition walls,

regarding Fasting65's suggestion, unfortunately, it's difficult to implement since there's a wall-mounted cabinet underneath that wouldn't be accessible anymore (the drain would come down from the ceiling right in front of the door). But I liked the idea.

Anyone else have any suggestions or think it wouldn't be possible to drill?
 
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