"John Borman" wrote in message
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"The Natural Philosopher" wrote in message
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John Borman wrote:

So should I be worried that the guy that's installed central heating
into
a renovated house cut a U section in the top of the beam ,of 1st floor.
That depends.

If its then had e.g chipboard nailed on top, a lot of the strength and
stiffness is restored.

No chipboard just t&g floorboards....

The strength will be restored to a degree far better by using screws, not
nails.