As the title indicates, I need to go through a ceiling beam in the intermediate floor to reach where the toilet is intended to be placed. It's an old house that was remodeled a bit in the '70s. The beam I plan to go through is 75x230mm and 1170mm long. In the middle, it supports a ledger from another ceiling beam.
What do you think? Add plywood on both sides and bring out the hole saw, or should one use metal? How far do you need to reinforce?
The circle indicates where I want to bring up the drainage, and the pipe is where it is currently located.
What do you think? Add plywood on both sides and bring out the hole saw, or should one use metal? How far do you need to reinforce?
The circle indicates where I want to bring up the drainage, and the pipe is where it is currently located.
It is important to make the hole as close to the center of the beam as possible and centered on the height. Reinforce with plywood on both sides. A 110 mm hole in a 230 mm high beam is actually too large. The saving grace for the beam is that it is so short. The best option would otherwise have been to move the beam slightly, but that may not be possible.
Thank you for your feedback.
What is the reason you think the implementation should be done near the midpoint of the beam's length?
What is the reason you think the implementation should be done near the midpoint of the beam's length?
This is because the internal forces in the beam differ slightly in different parts. Hole drilling at the beam's midpoint lengthwise does the least damage. One should avoid hole drilling near the supports. This is general knowledge.
Yes, there is a bit to think about. You come relatively close to the budget no matter what you do in this case. The question is how to counteract that in the best way.
Thank you for your thoughts.
Thank you for your thoughts.
A 75 mm hole is much better.
Perhaps it is a constructor who answered, but I have to wonder. With 21mm plywood, one on each side of the beam that is fully glued with wood glue and screwed tightly. I find it hard to see that it would weaken the beam. 42mm plywood is stronger than a stud, at least that's what I've learned.
The purpose of the plywood is to prevent cracking, not to compensate for the reduced load-bearing capacity. Threads in the Byggahus forum have many readers who may have similar but not identical problems.
It is clear that if you glue together two 21 mm plywood sheets, they can function as a beam. Plywood and wood have comparable elastic moduli. Plywood is absolutely less sensitive to perforations.
No, unfortunately not.P Per1234 said:
We are reconsidering the bathroom layout. I'll get back to you if we make a hole.