Plywood floor in a kitchen?

Hoploz

Whatever you put on top of the original floor boards will stop the inevitable draughts as long as it's a sealed finish.

System

You need insulation, not plywood!

I know you've chosen to ignore my first post on here but you should think about the issues and the problem you are trying to solve, if you've not got enough for cheap laminate then I would suggest saving for a while to make a proper job of it.
I've done some fitouts with very simple sheet materials (never a ply floor tbh) but the preparation is the key to a good finish as is understanding the opportunities and limitations of these materials. If you want the aesthetics of ply and understand it's going to wear badly compared to flooring then that's fine but it's not going to make your house any warmer...
Are you considering using it as planks or sheets?

rosie383

I wasn't ignoring your first post, honest! It gave me food for thought. On your advice and that of other posters, we have decided that plywood isn't the best option, so I'm glad that I asked and that you all took the time to reply.
Insulation under the floorboards, somehow, seems to be a good idea. We have already sanded them (while we had hired the sander for upstairs) and just covered them back up with underlay until the mess from the building work has gone.

peachyprice

You can buy special sealant for use between floorboard or use rope. As you've already gone to the trouble of sanding them this would be the simplest solution.