I have done this with extra blocking as Brian suggests. 2x4 was plenty to
provide additional support. I was replacing water damaged plywood under my
bathroom.
Sent from my iPhone
> On Dec 8, 2015, at 9:11 PM, Robert nogueira <nogera@me.com> wrote:
>
> I've got a little section of a floor which is spongy. The floor is 3/4"
> plywood with a over lay of 1/4" plywood all on 16 inch centers. The bad
> section is small and only between two joists. My plan was to cut out the
bad
> section between the joists and replace it with new plywood. My question, is
> plywood stiffer between two joists if a sheet spans several joists or will
my
> plan of one piece spanning between two joists be as stiff as a full sheet
> spanning several joists?
> Also, is plywood stiffer across its width or stiffer across its length
> I hope this all makes sense .
> Bob
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