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Walk Up Attic - Floor Insulation

My circa 1880 Victorian has a walk-up attic.  The floor in the space is tongue and groove and at some point a small amount of insulation has been blown into the floor.  The roof is uninsulated.  Unfortunately the heat is seeping throught the floor and on a very cold day it's very bearable in the unisulated attic as a result!  It would be very difficult, time consuming and difficult to blow more insulation into the floor.  I am wondering if I could/should install some hard board insulation on the floor, and cover it with plywood to protect it.  My concern would be trapping the air/humidity between the second floor ceiling and the attic floor.  At the moment it can breath very well.  Or is there a better solution?  Thanks.

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