I've just put down a layer of 2" OC 703 followed by 2 layers of 3/4" ply with green glue in between for our flooring. It feels quite stable and I'm wondering if it would be strong enough to put an upright piano on or is that much concentrated weight going to make the corner of the room sag.
Thanks!
Alex
Piano on OC 703 Floor
Originally posted at johnlsayers.com, topic 19315.