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Thanks for the explanation about the old insulation, my existing insulation is of the old fibreglass type like most 70's houses (as per mentioned by everyone here). They already shrank a lot, but should still have R0.5 value in it. R3.0 insulation on top of this layer should make it R3.5. The...

I'm getting greenstuf (same manufacturer as quietstuf) R3.0 polyester batts for $27.20 per bag covering 4.5m2 each bag. This is the cheapest price I can find at the moment. Btw, is there any disadvantage of not removing the old insulations and just put new ones on top of them?