hardwood problem - board edges
Solid hardwoord floors installed last fall, nailed down, crawlspace below.
My installer used a spongy underlayment which seems to be meant for floating floors.
After the first winter (northern Cal, cold but not COLD), during which there were many many LOUD pops and crack sounds at night, the floor now has many places where boards flex and the edges of boards are both visible and feel-able. I suspect the soft underlayment is flexing and that the loud cracks were maybe tongues cracking as the wood contracted for the first time.
Is there any remedy for this? Should I be as unhappy as I am?