Is carpet cushion necessary?

Yes, in areas that you may have a lot of roller traffic (ie, office chairs) we recommend a direct glue down installation with chair pads.  However, carpet cushion acts as a shock absorber extending the life of your carpet by keeping it from matting and crushing.  There are also many warranties that require a specific pound of cushion to be used otherwise the warranty will be void.  Please take the time to check with your carpet manufacturing warranty to be sure you are selecting the right cushion.