:
I'm in Fort Worth, TX and when I look at an online chart for the
'R' value of insulation I would need for my attic, it tells me 49.
(about 14" of cellulose. I think)

At the local DIY store they tell me that this is really overkill
and that about 30 will do about all I need.


The electric utility in Tucson AZ (where its hotter than FW) says to go with
R 30
Above that is a waste of $$