On Wed, 17 Mar 2021 16:31:21 -0700 (PDT), "
> wrote:

>On Wednesday, March 17, 2021 at 2:28:49 PM UTC-5, Cindy Hamilton wrote:
>>
>> The furnace is below the kitchen. No room for lally columns. But thanks
>> for the suggestion.
>>
>> Cindy Hamilton

Normally a joist would be set so the coloumb needn't be directly under
the kitchen... it's a very simple and inexpensive job for someone who
knows what they're doing. A joist could be made from three 2" x 8"s
bolted together... probably need a coloumb at each end of the joist.
Your house construction just needs some strenthening. I'm surprised
because older homes were over-built so that floors didn't bounce...
50+ years ago lumber was cheap... in fact back then lumber was full
size, a 2" x 4" was actually a full 2" x 4"... now lumber is 1/4"
less. Who ever built your house really cheaped out... a kitchen floor
should be rock solid.