Carpet underpad vs. foam

Q: I removed my old carpet. There is a thin padding underneath. It is in pretty good condition so I was wondering if I can install the engineered hardwood flooring over that instead of removing and putting the foam (as suggested by manufacturers.)

Is this something not to do?

A: I would say it is something “not to do”. With some products, including some Torly’s products, they insist their pad must be used. If you don’t and something goes wrong, they will not support the product because you did not follow their instructions. so, make the carpet pad disappear and used the correct pad, which also has a film which serves as a vapour barrier.