The insulation figure of merit, "cost of insulation per square foot R-value, is explained as a means of comparing insulating materials. While the insulation cost data in the original article dates back to November 1983, the concept of using an R-value normalized cost to evaluate insulation is...
Building Roll Heat Resistant Double Sided Aluminum Foil with Bubble Heat Insulation Material for Roof Double the bubbles for double the airspace. The more airspace in the product, the better it is at slowing heat transfer. Double bubble insulation ...