Floorboards with semi-circular lines underneath

[Possom]

I've seen pine floorboards for sale which instead of being flat underneath, have a number of semi-circular indentations which run the full length of the boards.

I think the person at the builders merchants said they allow more flex.

I know nothing about floorboards, so was just wondering if you're familiar with these, and if there are any comments to using these as opposed to the traditional floorboards which would not have these under them?

They would be used in a bathroom, with a steel bath (in case this makes any difference).

Thanks!

 

[Burnerman]

Some floorboards are grooved along their length - they to resist the tendency to 'cup' when they are fixed......no problems using either type.
John

 

[Possom]

Thanks John.