Laying chipboard flooring, can the instructions really be correct?

[Peter_K]

How on earth am I going to get this together?

"Jointing between sections is allowed, minimum length is 900 mm and each board must be fastened to at least two joists."

The floor is 510cm long and if I start with a whole board, it'll be 180+180+180=540. Then I can't start the next row with that piece if the minimum length is 90cm. If I cut a board in half, it's 90+180+180=450cm, meaning the last piece will be 60cm, which is too short according to the instructions. Did they make a mistake, or what? According to Elitgolv's instructions, the minimum piece is 200mm, if I understand it correctly. The floor is from Hornbach, Kronospan. Same as Byggmax, I think.

 

[JOW]

You get 30cm waste per row.
30/510 gives 5.8% waste.

180 + 180 + 150 = 510
150 + 180 + 180 = 510

If it says so in the instructions, then that's what applies.
But if you are building for yourself, you can always make exceptions.

But have you calculated how many boards you would save on that floor by doing it "wrong"?

Are there 240 boards from the same supplier?

 

[Peter_K]

It's going to be a maximum of 2 pieces so I can take that, they weren't that expensive. Yes, they were available in 240 lengths too but now they are purchased and brought inside the house, so it will probably be fine.

 

[Peter_K]

This is how it will be with that division. It will only be 6cm on the last row so maybe you should start by length-splitting the first row? I don't know what the minimum width is.

 

[JOW]

Well, maybe it didn't turn out as well as I initially thought?
Did all the seams end up in the same compartment now?

 

[Peter_K]

That's right, you have to take that into consideration. I'll go home and measure a bit more. Made a new drawing since the room is not square.

 

[JOW]

Yes, with other brands of tongue-and-groove chipboard, you cannot have a joint in the same section as the board length/lengths next to it. But I can't say anything about your boards as I haven't seen that instruction.

 

[Peter_K]

Here are the instructions

 

[Peter_K]

It wasn't exactly easy this. There ended up being some seams in the same compartment.
Studs in red and seams in purple.

Can anyone explain why the images end up in the wrong orientation even though they are saved and displayed correctly on the computer?

 

[Peter_K]

This should work, right? The 3rd row from the bottom starts with a 105cm board and then the seams end up on a floor beam instead.

 

[schmakita]

Place as many joints as possible on top of the studs. If a joint ends up roughly in the middle of the bay, support it with a noggin underneath. Overkill? Maybe, but it feels right

 

[Peter_K]

But isn't the whole idea of such a floor to be able to have joints between the floor joists? though not two next to each other in the same section.

 

[JOW]

Yes, that's how it is, and sometimes you have bad luck with the measurements.

 

[schmakita]

But isn't the whole idea of such a floor to be able to have joints between the floor joists? Just not two next to each other in the same section.

As I see it, that's not the whole idea, but it is approved and fully possible. In a modern house, you usually run at cc600 and then, of course, you place all the joints over the joists. In an older house, it's rarely exactly cc600 over all the joists, and then it becomes best effort. But as I said, it is fully possible to place joints between the joists if needed, but I don't think it is either desirable or "the whole idea." It's just possible to make it somewhat practical, economical, and quick to lay the flooring in most conceivable spaces.

 

[Peter_K]

Yes, it's not much work to screw in a few kortlingar, so one can afford that.