Difference between structural and non-structural ply, help please

[happyhero]

Hi I want to lay 12mm plywood sheets in my lounge to cover my roughish floorboards before laying insulation sheet and an engineered oak floor.

The reason I am going to so much trouble is we live in a drafty 1930’s house that I am slowly insulating as I do each room and want a bit of overkill. The ply will help give me and extra layer that I can butt right up to the corners under the skirting and it will be a great layer to lay my new floor on. And the cost of it is not prohibitively expensive either. I have also insulated under the floorboards.

There is no turning back now as I have made the floor standing rad pipes the right length to include the 12mm ply.

The thing is I keep seeing structural or non-structural ply but cannot find a clear answer to what the difference is and so don’t know if I should bother with the more expensive structural ply.

What’s the difference in their construction?

I have young kids so I am wondering about liquid spills etc, getting through.

I have bought some ply in the past and it delaminated which makes it like crap so I definitely don’t want that happening again. That was before I even used it. Is the delaminating less likely with structural?

Any info/links/advice appreciated

 

[foxhole]

You don't need structural ply, if enough water gets under then the oak floor is going to be ruined so ply is of no consequence.De-laminating less likely with structural but under the floor it would not be able to.