Fiber insulation is an outdated technology, and does not perform well outside the labratory. If you replace the fiberglass insulation in your home with spray foam, you will save 50% - 80% on your heating bill. Even just one inch of residential spray foam can outperform 6 inches of fiberglass.
Most of a home's heat-loss (80%) is through convection (air movement). Fiberglass does not stop air movement, but spray foam does. Even if the walls are well sealed there will still be some air convection within the fiberglass. This slow air migration carries heat away from the interior of the wall to the outsite (convective looping). Closed-cell spray foam acts as a building envelope and does not allow any air movement within the wall. With no convection it is much more effective at insulating your home.
Unlike Fiberglass, Cellulose, and Rockwool, Enviro Home's insulation does not lose its insulating properties in real-world situations.
Enviro Home's foam is applied as a liquid that expands. It gets into every crevice and knot hole. And then hardens to form a continuous air-tight seal. Since most heat loss (80%) is by air-infiltration or convection, this is why spray foam performs so well.
Making the right decisions when building or planning your home will affect its longevity, performance and your enjoyment for many years to come.