If I have some insulation, is it better to do a top up or completely replace the insulation?

If I have some insulation, is it better to do a top up or completely replace the insulation?

You can do a top up. No need to throw out effective insulation in good condition.
Even if your insulation has some holes or is compressed, you can usually still add another layer of insulation on top. And this is cheaper than removing existing insulation. 

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