When it comes to insulation, spray foam is a top-tier option. It can help you save up to 50% on your energy bills due to its remarkable heat retention capabilities. Closed-cell spray foam is the most efficient choice in terms of R-value per inch and cost. It is also vapor-impermeable and won't absorb water, making it an ideal selection for areas prone to water damage.
Additionally, it contains binders and glues that help bring a structure together and provide shear resistance. The downside is that the foaming agents used in closed-cell foams are hydrofluorocarbons, which are not so great for the environment. Once installed, spray foam insulation never needs maintenance or replacement. It's up to you to decide if it's the right choice for your home and where it should be used. Low-GWP options are a better choice for homeowners who opt for spray foam insulation.
While it may have the lowest R-value of the rigid foam options, it's also the most economical. Foam insulation doesn't hold water or moisture against the frame or drywall of your home, so you don't have to worry about damage in case of water intrusion. It's also a great solution for reducing noise from outside or between floors. Plus, it's more affordable than spray foam and doesn't require walls to be completely open. When hiring an insulation contractor, make sure they're familiar with low-GWP expanding agents and willing to use them. Once installed, spray foam should last the entire life of your home - unlike other forms of insulation that can be affected by water, closed-cell spray insulation is airtight.
