I would peek around at the airsealing below the existing insulation . If it looks like the attic was sufficiently airsealed at least a layer of plastic than I agree and would just add more to what is already there . If airsealing is subpar or nonexistent , I think the heat savings from airsealing would outweigh those from the extra Rvalue of the existing insulation . In that case I would take out the old shit , airseal , and then put down the new stuff . <| sep |> I wouldn ' t buy a 2009 without stage 2 of the oil consumption being done and the timing chain tensioner being replaced . source I own one . <| sep |> The problem here is that an enrage role has a value from 5 to 20 . So it means I killed telos without getting the enrage . 23 % is impossible