The percentage will take a few years to see any ROI
Insulation is a HUGE part of your home; it’s in your floors, walls, ceilings and roof. It’s the most cost effective way to making your house more energy efficient, keeping it warmer in the winter and cooler in the summer. Properly installed and cared for insulation can save you up to 40% in heating and cooling bills. Since insulation is an absorbent material, proper insulation removal and replacement is huge when dealing with any water damage or pest infestation.
while foam insulation is about two and a half times more expensive than fiberglass, the return on investment is amazing. The ROI is about three and a half years, which is less than 10 percent of an average building’s lifespan. Not only does foam insulate, it also seals up any infiltration for air and insects, making your home comfortable and insect free.
Spray foam insulation provides more than just insulation !!!
In the US a little over 70% of all fossil fuels are consumed by buildings (not vehicles). Of that amount almost 40% of those fuel costs are lost through a buildings air infiltration. Spray Foam insulation helps aid against that loss by filling gaps and crevices where installed.
The answer to this really depends on how much your electricity or fuel cost in your area. I happen to live in Douglas County Washington where electricity is under two cents a kilowatt hour as a result payback for spray foam insulation is nearly 40 years. The result is that virtually no one specifies spray foam insulation in their projects unless they are totally sold on the other benefits.