Ceiling, wall, underfloor insulation. What is the most important to address and what follows?

Ceiling, wall, underfloor insulation. What is the most important to address and what follows?

In order of importance:
1. Ceiling Insulation - Since 25-35% of your home’s heat escapes through an uninsulated ceiling
2. Wall Insulation - 15-25% of your costly conditioned air seeps out of your home via uninsulated (or poorly insulated) walls.
3. Floor Insulation – If there is space available. 

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