On 01/11/2020 15:23, The Natural Philosopher wrote:
On 01/11/2020 14:55, Andy Burns wrote:
John Rumm wrote:

Do you take similar care walking over a floor in a modern house?
Because the same arrangement of floor boards exists there.

Chip floorboards are 22m or 38mm though, compared to 18mm for loftboards.

Remember you are talking about a 2' wide board adjacent and
interlocked with another, spanning one joist space - so there is no
reason for it to give at the edge.

I have certainly managed to crack the odd tongue off my loftboards

18mm is also ok for floors


When the supporting joists are spaced at 450mm. New houses these
days have a 600mm spacing so they use 22mm chipboard flooring.