Considering the roughly equal performance, along with the significant differences of cost and installation time between fiber glass and SPF, the builders noted that fiber glass is a cost effective way to reach any requirement.

"Our goal is the most cost effective way to get to net zero. Fiber glass insulation with a complete sealing package is a key part of this."

- Bill Decker Sr. President Decker Homes

"From a cost/benefit ratio, we don't see the benefit in spending an extreme amount more on SPF to get the same thermal or air infiltration benefits as a standard sealing package with fiber glass."

- Tom Benedict, Vice President of Purchasing Wayne Homes