Replacing single floorboard with plywood

[xdrive]

Hi

I have 144x 22mm floorboards

I've pulled few up which need replacing indivisually

I have 18mm plywood I used for new kitchen floor

Can I cut to same size as floorboard and replace? Would it hold its strength?

Will build up with thin ply so final floor is level

Thanks

 

[Deleted member 174758]

As long as you lay the plywood as a single piece (i.e the width of several adjacent planks) you'll be OK. If you intend to lay 144mm wide rips of 18mm to replace individual softwood planks you'd be better off laying replacement softwood boards, which will be stiffer, and if needs be packing to the required floor height with thin plywood, hardboard, etc

 

[xdrive]

It was for single board. Didn't work. Too much flex.

 

[big-all]

18mm should be rock solid assuming joists at 400 centres [350 mm gaps
has the ply been subject to prolonged damp 'moisture or wet ??

 

[Deleted member 174758]

It depends a lot on the plywood, B-A. For single planks softwood is always stiffer

 

[xdrive]

18mm should be rock solid assuming joists at 400 centres [350 mm gaps
has the ply been subject to prolonged damp 'moisture or wet ??

I needed only 40 cm length.

It's been dry stored indoors

Maybe over 3 joists would make a difference but for a small piece it didn't work

 

[big-all]

It depends a lot on the plywood, B-A. For single planks softwood is always stiffer

it must be the ply lol
my workshop has 18mm at 600 centres and rock solid and i am a fat bugger but it is 18 year old so suppose the cheap Chinese carp is often normal now ???