raise rock. drop. document effect.

A few weeks ago, I checked the US Department of Energy's Insulation Fact Sheet and noted that I should have R-38 insulation in my attic, based on 3 factors:

1. new or existing;
2. type of heat (oil, gas, electric);
3. location, location, location

A quick measure showed that what's up there was only R-16 or so and using recent-technology loose-fill (blown-in) insulation would be the best.

Playing with the Insulation Calculator was educational. For my ZIP code, they recommend R-38 in attics where the fuel is natural gas; oil or a heat pump but R-49 for electric or LPG [Liquid Propane]. For all new construction, they're recommending R-49.

The contractor said it would take one day to "install" the additional insulation, and they were finished on schedule yesterday. Now I can wait for my energy costs to drop like a rock, right?