attic insulation: replace or top up?

[noel 2006]

I wish to upgrade my attic insulation. I am wondering whether it is better to top the the existing insulation or replace it with new insulation.

 

[notagardener]

Had a feeling I read about this before

http://www.askaboutmoney.com/showthread.php?t=121026

 

[noel 2006]

Thanks notagardener. I have decide to top up.