I would like to add more insulation to an attic. What measurements and points do I need to look at to decide what materials to buy?
How do I determine if I need airflow baffles?
How do I determine how much insulation to purchase? Measure the area of the attic and then figure out the necessary thickness to get the desired R value?
What ancillary items should I plan for? Insulated attic access, critter-proofing, etc?
What tools or extras will make the job easier?
There is lots of information about why to insulate and how to install insulation, but not much on how to buy the right materials and only make one trip to the store and do the job right the first time.