Must the subfloor be completely tight?

[Sir Duke]

Hello everyone!
I'm extending the house and there will be a crawl space under the extension.
I went and bought subfloor boards 55x120 cm. But now I've discovered that the construction company has built so that the compartments aren't exactly 120 cm long but about 125.
Is it okay to leave a gap? Or do I need to bite the bullet and spend the weekend cutting 60 strips to cover everything completely?
Above the board, there will be 10 cm of foam, and above that 12 cm of fiberglass wool.
I understand the issues with moisture reaching the floor joist, but I'm hoping the foam will handle that.
What do you say?
Many thanks in advance!

 

[SBH]

45 regulations? that you lay the tross on?

 

[Nils82]

Hey.
SBH has a point here. It should be tight, but mainly for rats and mice........and drafts of course. Moisture is not a problem in that way.

 

[Sir Duke]

Do you mean that I should add extra studs where the gap is? Hmm, yes, maybe that.
But if the gap is more than 45 mm, there will still be a small air gap, how do you handle that? Is it allowed?
And I've learned that crawl spaces are by definition a no-no, always moisture problems...

 

[Nils82]

45 + 45. It goes both ways, so to speak. That is, 90 mm.

 

[Sir Duke]

Hmm I don't understand where the 45r should be placed.
The company has already installed 28x70 glespanel under the beams as support for the trossbottenskivorna.
Can the 45r be placed in the bjälklag and fill out?

 

[hagv]

Hmm I don't understand where the 45s should be placed. The company has already put 28x70 grid panel under the beams as support for the bottom boards. Can the 45s be placed in the joist to fill out?

They probably mean that you can place the 45s on the grid, so you get even thicker support and thus no gap.

 

[Sir Duke]

Aha yes but I mean it's not gaping on that axis. It's gaping because the boards are only 120 cm long. But the builders have placed the cross floor joists about 125 cm apart (varies a bit).

 

[SBH]

why are you trying to get split troll boards for? I had to split them myself

 

[Sir Duke]

Hehe. They were probably a bit more expensive. It's just regular masonite but with dimensions that are supposed to fit in the joists. But in my case, they didn't quite fit, leaving some air over the length...

But, oh well. How critical is it with an air gap (so that the cellular plastic is visible)? Important to cover it, or is it okay? If the subfloor boards are only meant to support the insulation, then it works. But if it needs to be completely covered, then I'm not there...

 

[Nils82]

Well, well....then 45x45 isn't an option. Go with 120 sparse then. Or split the trossen in two and use spill now and then. You want a tight trossbotten, however you solve it!

 

[Sir Duke]

Nice!
I'll put up some extra gles to cover the gaps. It's easier to cut that and screw it up than to start cutting strips of the trossboard.
Thanks and goodnight everyone!

 

[SBH]

Hehe. They were probably a bit more expensive. It's just ordinary masonite but with dimensions meant to fit in the joists. But in my case, they didn't quite fit, leaving some air gaps on the length...

But but. How critical is it to have an air gap (so that the foam is visible)? Important to cover or does it manage? If the subfloor boards are just meant to hold up the insulation, then it works. But if it needs to be completely covered, then I'm not doing it right...

absolutely not ordinary masonite, both thick and oil-hardened it should be

 

[Sir Duke]

I was unclear. It's 6 mm and oil-hardened that I got