theres a lot of work gone into the above posts
well done mate
i hate to to be picky
is 9mm ply enough to take the flex out of a wooden floor, would reccomending plastic ply to newbies be better
overlaying with ply was the best system available but if better products are developed specificaly for a job
wouldnt we be better to promote this
i have noticed a marked increase in ply prices over the last few years
coupled with a marked drop in quality of the ply
far eastern ply is compressing when screwed, not a small area where you drive the screw under the surface but saucer sized indents where the inner laminate is compressing under the stronger outer laminate
also voids in the inner laminates,
when you drive screws in you feel the difference , its like screwing plasterboard now
too heavy on the trigger and your through to the bottom laminate
this ply is unsuitable for overlaying floors as its likely to compress under the weight
this ply is turning up everywhere as decent ply is in short supply and very expensive
anyone who cant spot the difference could be storing up trouble for the future
i would reccomend not using ply for overboarding