Laying tongue and groove boards in the attic - tips

I believe in the 10-20€ more, if at all, it shouldn’t fail then if I prefer to make it tighter. Just asked the building material supplier, 30x50 costs 0.61€ net per running meter, 40x60 would be 0.85€/running meter net.

But if you have the time and money to spare, of course that doesn't hurt.

Having time and money to spare is never a bad thing :)

Whereas with a 40cm distance you could also get by with 19mm rough-sawn decking. The greater leverage is exerted over the area.

Just lay down 2 battens, put 3 rough-sawn boards on top and stand on it. This way you can test at which distance you no longer get the feeling of standing a whole floor lower.

But if you only try it on 2 battens, that is not meaningful, because later the rough-sawn boards are each attached to several battens that absorb the forces. We have 22mm rough-sawn boards on the original spacing of about 90cm, nothing bends when you walk on it.

If you only try that on 2 battens, it's not meaningful, because the tongue and groove boards are later fixed to several battens, which absorb the forces. We have 22mm tongue and groove boards on the original spacing of about 90, nothing bends when you walk over it.

Good point. So put 2 crates of beer on each end.

Just a quick note about optimal installation/requirements.

The following consideration. I take the 5m slats in 30x50, with the 50 side lying flat and the 30 going vertical. I have the 5m cut into 2x2m and 1x1m lengths.

A roof beam is about 7cm thick, then there is an internal measurement to the next beam of about 90cm and then another 7cm beam. This means I can easily go from one beam to the other with a 1m piece (about 104cm) and have enough play to align on both beams so that no end hangs in the air. With the 2m pieces I can reach one more beam, so 201cm (7cm,90cm,7cm,90cm,7cm). Even there no ends would hang in the air. For the following slat I then lack the support surface on the beam if end to end, but I can continue in an offset. So the new slat next to the previous one.

Do I have a flaw in my thinking? Or does it fit like this?

Thanks!