Answer by
mthlakshmi8gmailcom (14)
Insulation should go first. with respect to tis insulation,what you are looking for is an ideal "R" value. If what you have now is equal to R-6 and your tagetwas R-25 you would to install the R-19 "6"
thick attic insulation. The only reason you might want to at least temporarily remove the existing insulation is to lay down a vapor barrier first.