Rigid foam insulation has a high R-value, although not as high as aerosol foam. It is less expensive than spray foam insulation, and because of the way it is installed and its structure, it can contribute to the strength of walls. On the other hand, aerosol foam insulation has a higher R-value and can be applied in inaccessible and hard-to-reach places. Foam insulation is a relatively modern material made of several chemical compounds, including polyurethane, polyisocyanurate, polystyrene and polyol resin.
It has gained popularity among homeowners, architects, and contractors alike due to its ability to block heat transfer by convection, radiation and conduction. This makes foam insulation have a very high R-value (also known as thermal resistance to heat flow).Extruded foam is more resistant to moisture and less likely to settle when exposed to water. It can be cut to fit a wide variety of spaces, making it a great option for irregular wall assemblies. Closed-cell aerosol foam offers the highest R values of all insulating materials currently available on the market. To determine which of these foam insulation options is right for your home, you should consult an insulation technician or contractor with experience in your area.
They will be able to advise you on the best option for your needs and budget.