Hello,
I am currently preparing the last part of our house.
It's an old 2-story house from the late 1700s/early 1800s. This particular part of the house is an extension, but no one knows when.
The room measures about 6x6m, with no walls underneath for support, as the house's "sitting room" is below.
This room has never been used for anything other than storage before, a bit like an attic space.
In other words, it has acted as a storage room with quite a lot of weight on it. It has tilted significantly and flexed quite a bit when stepping/jumping on the floor.
There was an old wedge-cut wooden floor with borders throughout the room, which has been removed, and I am in the process of planing it as I write. The idea, of course, is to reuse it.
The existing beams are approximately spaced at 80cm center-to-center. What I have done is glue and screw new joists on each side of the beams, which measure 45x220. However, it's really difficult to glue against a crooked beam, so most likely the glue is ineffective.
After that, I have added cross-bracing, 3x in each "compartment."
Is this sufficient? Now there’s a 60cm center-to-center between the new joists.
There will be some children's rooms in this space, so several walls will thus connect the floor and ceiling.
Now the floor is about 22mm thick after planing. The floor is with tongue and loose groove.
Is this thickness sufficient, or should I lay some chipboard under the wooden floor? I saw that there are thinner options available, both 12mm and 16mm. 22mm feels overkill, and I'm concerned about ceiling height, as much of it was lost when I straightened it up.
Nice! I did pretty much the same job a couple of months ago in a similarly sized room.
I might be misunderstanding, but is your question whether your now realigned intermediate floor will be sufficient for using the room? If so, I dare say that's more than the case.
It was sufficient before as well. The timber is load-bearing and intended to be so. So your reinforcements mostly serve to realign the floor.
Your 22 mm floor must be considered adequate since particleboard flooring used as subflooring is 22 mm and you could have only put, for example, a carpet on it, which doesn't contribute any strength.
Additionally, there's träguiden to look at, although it doesn't match your case. The span of your joists is not 6 meters since they are screwed into the timber, which bears the span.
Furthermore, after realigning my 6-inch timber floor, I also had 60 cm centers but with 45 x 145 mm joists. I didn't glue, but used solid screws - 6 x 160 mm.
Thank you for your answers!
I think it will hold.
I just want it to feel steady and good without too much "sway" in the middle.
Would it have been a good idea to insert some laminated beams between the logs or do you consider that overkill?
I was up in the attic today, and it sways a lot in the middle.
But maybe they used thinner logs there because no one was supposed to be up there anyway?
It does not meet the new construction standards regarding deflection and deformation. However, it will be significantly better than it was before, which one often has to be satisfied with during renovation
Hello
I would ensure that the studs attached to the beams are properly secured, perhaps there is some glue that can be poured between the studs and beams.
It's important that they are securely fastened.
Then I would cross-brace or install noggings between them, securing them with screws and glue.
Last but not least, make sure that the short pieces laid across the beams between the studs are aligned with the noggings between the studs attached to the beams.
Everything should be firm, and nothing should be unsupported.
Nice that you are planing and putting back the old floor
/Workingclasshero
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