Energy Star says, “The proper type and level of insulation for your home provides a continuous thermal barrier minimizing heat flow through the walls, ceiling, and floor. The result is a more comfortable home and reduced heating and cooling costs. Installing insulation properly is as important as the type and level of insulation because gaps, voids, compression, and moisture reduce the effectiveness of insulation and allow unconditioned air to enter your home. Insulation levels are specified by R-Value, which is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation.”
The best insulation on the market that fits the criteria above to enjoy the most benefits with the least amount of input is – Foam It Green Closed Cell Spray Foam Insulation. Inch for inch, Foam It Green Polyurethane Spray Foam Kits have the highest R-Value insulation at 7 per Inch. It completely seals gaps and voids where other forms of insulation can’t reach. It’s self adhesive, so it can be sprayed onto your ceiling and stay put. It won’t hold moisture, and is the only ASTM G21 certified foam who’s additive won’t grow mold, even on the surface.
And, unlike batt or blown in insulation, you only ever have to spray foam once. It never sags or settles so you get a lifetime of a sealed building envelope, and energy efficiency.