Is 60 cm cc a must for chipboard flooring?

[major_tom]

Currently renovating a room on the upper floor of a 1 ½ story house from 1850, last renovated around 1950, with a span of about 550 cm for the floor joists.

Original state: joists at about 80-90 cm centers, dimensions approximately 50x170 mm (sometimes thinner). Only a thin plank floor was laid on this. The construction was perceived as shaky according to modern standards.

Current state: we have reinforced all the joists with a 45x170 on each side and taken the opportunity to level them. We want to lay glued and screwed flooring chipboard and then a plank floor. All flooring chipboards we've looked at require 60 cm centers. Will there be too much flex if we lay it with the current spacing, even with an additional layer of solid flooring on top screwed into the chipboard?

 

[Intet]

My belief is that it's going perfectly.

 

[fribygg]

Consider a rougher wooden floor instead?

If you choose jointed 2-inch lumber, it should be able to support even with 800 mm center spacing (the large span is more difficult to overcome).

 

[erikjakan]

Lay a proper plank floor instead, 80-90cc is too much for particleboard flooring.

https://www.sekelskifte.com/products/furugolv-45x110-mm-16

https://www.sekelskifte.com/products/furugolv-33x135-mm-9

Best regards, Erik

 

[major_tom]

Have you considered a thicker wooden floor instead?

If you choose tongue and groove 2-inch wood, it should be able to bear even with an 800 mm center distance, (the large span is harder to overcome)

A thicker floor would of course be nice, but I don't know if our budget allows for it. I agree that the span is on the long side, it was probably a wall that was removed on the floor below without sufficient consideration. We want to install something like a laminated beam in the ceiling of the underlying room when it's time for renovation there.

 

[Tjrex]

There are chipboards for flooring that are both 30 and 38mm. https://www.forestia.se/produkter/forestia-golvspanskiva-standard-30-och-38-mm/

Glued chipboards for flooring become much more stable than the same thickness with tongue and groove.

 

[fribygg]

Current situation: we have reinforced all the beams with a 45x170 on each side and took the opportunity to level them. We want to lay screw-glued chipboard flooring and then plank flooring.

Suggestion: space out the new 45*170 joists so that the center-to-center distance is halved, i.e., loosen every other new floor joist and place it in the middle of the bay instead, in this way you should be able to achieve a maximum joist spacing of 450mm (and that is suitable for chipboard flooring).

 

[erikjakan]

A coarser floor would of course have been nice, but I don't know if our budget allows it.
I agree that the span is on the long side, it was probably a wall that was removed on the floor below without sufficient consideration. We want to install, for example, a glued laminated timber beam in the ceiling of the underlying room when it's time for renovation there.

But, you can disregard both the chipboard, the glue, the screw as well as the work if you skip it.

 

[major_tom]

I had just assumed it would be more stable with chipboard + wood flooring, but now that I see you can go down to 30 mm for wood floors and still have 80 cm spacing, maybe I need to reconsider...
Originally wanted to reuse the old thin wood floor (hence the chipboard first), but maybe it will have to be wall paneling instead...