I just got done remodeling my bathroom, and retiled the floor. Unfortunately the floor is lower now and the toilet flange is about 1" above the floor. i understand you want the flange about 1/4" above the floor. What do I need to do to fix this? The pipe is cast iron and the flange is abs plastic. Should I cut a piece of plywood to fit under the watercloset to make up the difference?

Thanks in advance,