The newest and most effective way to insulate an attic is with spray foam insulation. Spray foam insulation starts as a thin film and then expands up to 100 times its volume in less than 10 seconds.
By installing spray foam insulation in your attic, you are creating a conditioned area, which means that the temperature of your attic will be close to, if not as comfortable, as the temperature inside of your home. By substantially reducing the temperature in your attic with spray foam insulation, you are also greatly reducing the workload for your HVAC system.
Since your HVAC system is the largest consumer of energy in your home and your attic is the largest source of energy loss, spray foam insulation will significantly reduce your energy bills and increase the comfort level and value of your home.