The chemical reactions and pathways resulting in the formation of isopentenyl diphosphate by the mevalonate pathway that contributes to terpenoid biosynthesis. This pathway converts acetate, in the form of acetyl-CoA, to isopentenyl diphosphate (IPP) through a series of mevalonate intermediates.
isopentenyl diphosphate biosynthetic process, mevalonate pathway, during terpenoid biosynthetic process