Steel beam or wood in flooring

[xl15]

I am planning to install a new floor structure in a bedroom. The old one is sagging and is uneven and crooked (over 100 years old). The room is 6 m wide and 5 m long. There is a 200x200 mm support post in the middle. I'm considering a beam or something similar in the middle of the room to create two halves with a 3 m span. The question is whether it can be reasonably solved with wood, or if I need to use a steel beam instead. I want to keep the thickness of the floor structure as low as possible. Then glued and screwed chipboard will be placed on top.

 

[fribygg]

I guess that the house previously had too much space between the floor joists, if you place the new ones closer together, the sagging should decrease.

 

[xl15]

It wasn't even a real floor structure. A log in the middle (where I might put a steel beam) and no joists, just boards. However, there are beams in the room below that have contributed some strength.

 

[Tompafix]

Planning to build a new floor structure in a bedroom. The old one is sagging and is crooked and uneven (over 100 years old).
The room is 6 m wide and 5 m long. There is a supporting post in the middle measuring 200x200 mm.
Thinking of a beam or something similar in the middle of the room to create two halves with a 3 m span.
The question is whether it can be reasonably solved with wood or if I need to bring in a steel beam?
I want to keep the thickness of the floor structure down as much as possible. Screwed-glued chipboard will go on top afterwards.

[image]

Should the beam be embedded in the floor structure or be on the floor below?
You can keep the dimensions of the floor structure down with smaller center-to-center measurements between the floor joists.
Here you can play a little with dimensions and the like https://www.byggbeskrivningar.se/dimensionering/med-meny/

 

[xl15]

The beam should be recessed into the joist. I thought the studs would be 120x45 with 300cc spacing. According to this list, they are sufficient for a span of 264 cm: Golvbjälkar av konstruktionsvirke i ett fack - TräGuiden (traguiden.se)
Sure, I have 300 cm, but that's close enough.

 

[Tompafix]

The beam will be recessed into the floor joists. I was thinking of using 120x45 studs and 300 c-c. According to this list, it's sufficient for a span of 264 cm: Floor Joists of Structural Timber in One Section - TräGuiden (traguiden.se)
Sure, I have 300 cm, but that's close enough.

If you stick to only 120mm, there is no wooden beam that meets the requirements. Then you'd have to use a steel beam.
But you can turn the floor joists so that it only has a 2.5m span.

 

[kniv]

How were you planning to attach the floor structure to the beam you are now choosing (both steel or wood)?

 

[Tompafix]

Like this for example https://www.festool.se/kunskapsbank...ta-fast-en-traebalk-i-en-stålbalk#Beskrivning