Me too! I had it done and it lasts ages but my hair is very thick and I have lots of it. Hairdresser back combed the roots with a brush and put wax on each curl as she took out each roller. Lots of hairspray afterwards.
I'd say if your hair is long you are unlikely to get much volume at the roots.
Especially if the method you are trying is large rollers. I blow dry my hair round a bristle brush and blow dry upwards so the roots are at right angles to my scalp (if that makes sense!) but my hair is only shoulder length.