Comfort Insulation, in St. Leonard, Md., used spray foam insulation to seal all penetrations from the conditioned spaces into the attic.
The NAHB Research Center says reducing air infiltration, in some cases, can improve energy efficiency more than insulaiton.
Dan Robinette from Minnick's in Laurel, Md., says this is a perfect example of improper attic insulation.
This attic space has a combination of improper insulation, and poor sealing of venting penetrations and chaseway, Robinette says.
An example of attic insulation done right. Robinette recommends an R value of at least a 40 and above.
After air sealing with spray foam, contractors blew in 13 inches of cellulose insulation, which should go a long way towards making my house more energy efficient and lowering my electric bills.