Plywood Beauty Contest

[Reynardine]

Which of these is the most suitable / least suitable to lay on top of joists to create a sub floor.

• Standard WBP Plywood
  Shuttering WBP Plywood
  Marine Plywood
  Spruce Plywood
  Formwork Plywood

 

[JohnD]

what are you going to put on top of it?

What room is it?

 

[Reynardine]

It's a living room.

I'm going to put down a plywood floor, screwed to the joists, followed by a heavy carpet underlay, followed by a carpet.

[ I am replacing old 25mm floorboards so if choose 18mm ply this will leave a gap of 7mm. I could possibly fill this with some proprietory mineral loaded soundproofing felt or similar , beneath the underlay. ]

 

[JohnD]

Standard WBP then.

Marine is very expensive, the others can have very rough surfaces.

Have a look at some samples in the yard before you buy.

Some spruce ply is reasonable, but some has open knots etc.