Owain wrote:
Ian Smeaton wrote:
It looks like wedges might be an answer to bridging the gap, but would they
stay in place?

They will if you slather them in glue before whacking them in, and do it
last thing at night so it sets before the floor is walked on.

Or you could fill the gap with car body filler.

cartoon
A DIY scene:
The caption, "No more squeaks".
A 2" hole drilled through the floor, and 18 empty 55 gallon drums of car
body filler that have been poured through the hole.
/cartoon