I will build an interior wall in a space in our future vacation home. The house is newly built on a crawl space and the floor joists are spaced at 30 cm centers. The space is about 15 square meters and will be divided into two parts - a bathroom and a hallway. Stone flooring will be laid in both the hall and bathroom.

The question is whether I should first lay subfloor across the entire space and then build the interior wall, or if I should build the wall on the joists and then lay subfloor in each respective area. Later, the surfaces in the bathroom and hallway will be leveled with self-leveling compound, etc.
 
Do as you wish, but it will be difficult if you have to break up the floor later if it goes under the wall.
 
There will also be better soundproofing if you build the wall first.
 
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Thank you for the quick responses, I understand your points - however, my thesis was that the floor becomes stiffer if I lay the board over the entire space first and then build the wall. When laying a stone floor, you want as stiff a substrate as possible.
 
I would have laid the subfloor first. Are you going to use self-leveling compound for the underfloor heating?
The slope in the bathroom can be created with shims on the floor joists before you lay the subfloor.
Does any wall run along the floor joists? If so, you'll need more timber for nogging, etc., if you build the wall first.

Best regards, Niklas
 
Joining in on this thread with a question. I'm going to renovate a bathroom.

Is it OK to start with the floor chipboard and then put the drywall on the walls? It would be so much easier to do the walls with a complete floor to work on :)
 
Yes, that's likely fine. Why didn't you think to do that?
 
Felt like my thread got hijacked... would like a couple more opinions. Is it that the spån should be laid first or does it not matter?
 
Absolutely easiest to lay the shavings first. I wouldn't have hesitated for a second.
 
Thank you for that answer andersmc. I am also convinced that it's easier. However, the wall needs to be built to complete the electrical installation, and I can't lay the floor just yet because the plumber has not (been hired...) and therefore hasn't installed the drainage, floor drain, etc. in the bathroom.

The question is, does it matter for the construction? I can imagine taking the trouble to lay chipboard in two spaces instead of one.
 
No matter how you twist it, in the end, it always becomes a circle where something has to be built first so that you can continue with the second and the third, but the third must be done before you can start with the first...

For example, you don't need to complete the electricity entirely; you can just prepare by letting the conduits hang from the ceiling where the wall will eventually be.
 
It's probably more common to remove an inner wall than to tear up the floor. So underlayment first.
 
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