Adding fiberglass in attic to save on heating bill

Dear Tom,
Read your article in Saturday's BDN. Our two story home is roughly 20 years old. It has six or seven inches of fiberglass in the attic. This past winter our heating bill was about $3,000.00, up from about $1300.00!! What to do? I have been thinking about having an additional 10 or 12 inches of fiberglass blown in on top of the existing fiberglass for a total about 19 inches. Do you think we need more? We would appreciate your interest and recommendations.
Many thanks,
Bob


Hey Bob,
Yes, for starters, add the 10-12 inches. More would hit diminishing returns, even with these oil prices.
Make sure the hatch area is insulated and sealed thoroughly. Check all the penetrations into the attic--the plumbing vents, chimney, etc. and seal them all before adding the extra insulation.
Tom