I currently have a finished basement that I know the ductwork was not insulated. I can feel the cold or heat areas just above the ductwork on the floor area just above. I plan to install bamboo flooring on all the floors on the second floor, just above the basement. Should I be concerned with these cold and hotter areas warping the new bamboo flooring? Can I minimize this by insulating the ductwork on the areas that I feel the second floor temperature differences? Is there an underlayment that could help to protect my new bamboo installed flooring?
I was told by a flooring store that if I nail down bamboo flooring there is no need for underlayment. Seems a bit strange to me. Any recommendations?