Had this problem myself a while back.Was told a good short term measure is
to rub talc powder between the joints but didnt really work well for
me.Floorboards were ok so i was able to just put a couple of screws in as
the nails didnt hold well enough and problem was solved.But please please
please be very careful where you place the nails/screws.Follow the old line
of nails and you shouldnt go far wrong,get a cheap pipe detector just to be
safe.Far cheaper than having to call out a plumber! ;-)
If you're going to that extent and want a long term solution? a piece of
cork matting on each joist where the floorboard rest and screw the
floorboard down not nail it.
Nailing it backdown will eventually rise to the floorboard becoming loose
Whenever screwing down floor boards without taking them up always keep near
to the edge of them as there might be channels in the middle below which
Without seeing them I can't say. If the existing ones are split/damaged from
previous lifting and can't be screwed down solid then probably yes. The
problem with replacing only some of them could be finding new ones of the
same thickness and width.
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