The Catholic Church consider that ashes should be buried, here is their response:
“The stance of the Catholic Church is that ashes should be treated in the same way as the bodies of the dead. They should be returned to the the earth.
The Catholic “Order of Christian Funerals” provides a Service for the Burial of Ashes.
If you want more information they suggest you contact the Department of Christian Life and Worship of the Catholic Bishops’ Conference of England and Wales at 39 Eccelston Square London SW1V 1BX Tel: 020 7901 4851″