The old saying, “You get what you pay for” holds so true when it comes to re-insulating existing homes. Besides non-expanding injected foam, the other popular way to re-insulate is by using blown in fiberglass or cellulose. These applications are “dry” products. As far as the application process goes, the injected foam and “dry” products are very similar. However, the performance benefits between the “dry” products and injected foam are clearly different.
There are major down sides of using the “dry” products, some of which are listed here:
- Being a “dry” product means product will settle and leave gaps in the cavities.
- “Dry” products have bridging problems and won’t completely plug and seal all gaps. Un-insulated gaps cause the inability to get a complete air-seal in the cavities. Having a complete air-seal in the cavities is important when it comes to energy savings.
- When applying the “dry” products, there is a tendency by the installers to over apply the product in the cavities, which causes for a high rate of wall blow-outs. These blow-outs are very messy and costly to repair.
Injected Foam has none of these above listed problems.
So please consider all options when it comes to making the decision between the slightly cheaper “dry” products of blown in fiberglass or cellulose over the much more efficient injected foam method.