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I though it sounded a bit drastic too, it was just my dad ( ex engineer/builder) mentioned it so I figured it would be worth looking into.
jeff80-
Some times in the morning ideas don't seem so good! Occasionally the bond to the underplaster had deteriorated to the point where it crumbles off with a finger and it's just the top layer balancing on the wall, your dad would have seen this a mile off, do you really want to get into removing good plaster? Most probably not.
bluehuw
Guess I'm saying if the plaster has blown get it off, and see the condition of other plaster that may have been added or if the bond of the under coating has deteriorated beyond repair, putting bitumen paint on an interior wall is more drastic than I've ever heard