As part of renovating their home, my clients asked me to repair their main living room floor.  The floor angles down 6" across the width of the room!  Unfortunately, the house had been originally framed this way (the windows and exterior brick facade also angled down the same amount!).  I explained to them that we could demolish and reframe this portion of his 100-year-old house, but it would require taking the walls down, brick facade off and major expense.  I analyzed the situation and recommended that we stabilize the existing floor system from below, leaving the exterior walls and facade in place.  Then we could add a new layer of structure to the floor from above to level it out as much as possible.  And finally,  we could add new hardwood flooring to finish it out.  This way, the house would be stable, the walls would remain in place, and he would save about $50-$75K in expense.  This was the most pragmatic solution to his framing dilemma.  They greatly appreciated that I walked through the options with them and explained the tradeoffs and recommended a good solution.