How to install carpet jute?

I removed the old jute from the back of the carpet and made replacement pieces by using the old pieces as templates to trace over new jute. My plan was to glue the new jute to the back of the carpet the way the original was. While stopping at a local upholstery shop to buy glue for the jute I told them what I was working on and what I was doing and they told me the jute is supposed to be glued to the floor, not to the carpet. I told them how the original jute and carpet came in one piece and they insisted that the jute was supposed to be glued to the floor.
Has anyone else done this before? How is the jute really supposed to be installed? It doesn't make any sense to me why the original jute was glued to the carpet if it isn't supposed to be that way.


