As more Vermont homeowners take steps to improve their homes’ energy efficiency, many are starting to ask smarter questions, especially when it comes to insulation. More specifically, a desire to know the difference between blown-in cellulose and spray foam insulation. Both types have their place, so here’s what you need to know before starting your next insulation project.
The Two Most Common Types of Insulation
Blown-In Cellulose Insulation
Blown-in cellulose is made from recycled paper materials treated for fire and pest resistance. It’s typically used to insulate attic floors and sometimes wall cavities, especially in older homes that need a boost in R-value (the measure of resistance to heat flow). It’s installed using a machine that blows the insulation out of a wide hose, creating a blanket of coverage.
Spray Foam Insulation
Spray foam insulation starts as a liquid and expands rapidly once applied, then hardens. Spray foam fills gaps, cracks, and crevices before curing into a durable, high-performance insulation layer. There are two types: open-cell and closed-cell, with closed-cell offering higher R-values and excellent moisture vapor resistance.
What Problems Do They Each Solve?
Blown-In Cellulose:
- Adds insulation to unfinished or hard-to-reach spaces.
- Improves comfort by reducing heat loss and improving thermal resistance.
- Helps prevent ice dams, especially when installed in attics.
- A solid option when access or budgetary constraints exist.
Spray Foam:
- Creates a tight thermal envelope by sealing air leaks at the source.
- Acts as a vapor retardant, helping control moisture and reduce the risk of mold or rot.
- Helps prevent ice dams, especially in attics and rim joists.
- Minimizes drafts and temperature swings, improving year-round comfort.
- Ideal for crawl spaces, basements, rim joists, and more.
In most cases, spray foam offers superior performance by solving both air leakage and insulation issues at once. For Vermont’s cold winters and humid summers, it’s often the smartest long-term solution.
Why Spray Foam Is Often the Better Choice
At Vermont Foam Insulation, we recommend spray foam for most projects, not because it’s trendy, but because it simply performs better in Vermont’s climate. Here’s why:
- High R-Value: Closed-cell spray foam delivers an R-value of around 6.5+ per inch, far exceeding cellulose and fiberglass.
- Air Sealing: It eliminates the need for a separate air barrier, saving time and energy long-term.
- Moisture Control: It acts as a vapor retardant, reducing the risk of condensation, mold, and moisture damage.
- Structural Integrity: Closed-cell foam can even add strength to walls and roofs.
- Energy Savings: Because it seals so effectively, spray foam reduces the energy required for heating and cooling.
Plus, spray foam can be installed year-round, even during Vermont’s coldest months, a huge advantage when timing your home upgrades.
When Cellulose Might Be the Right Fit
While spray foam is usually our top recommendation, blown-in cellulose is still a valuable material for certain projects. It may be the better choice when:
- A homeowner prefers a recycled or non-foam product.
- A project is constrained by building codes or restrictions, such as in some historic renovations.
- The structure is already air sealed, and additional insulation is needed to boost thermal performance.
Our team helps you weigh these factors during your site evaluation to make sure you get the best product for your home, installed by the experts.
Professional Installation Matters
Spray foam is not a DIY product. If it’s installed incorrectly, without proper ventilation planning or attention to building science, it can cause problems down the line, including trapped moisture and indoor air quality issues.
That’s why choosing an experienced contractor like Vermont Foam Insulation matters. Our team is trained to understand your home’s unique building envelope, ensuring every spray foam application is backed by proper testing, airflow strategies, and best practices. We stand by our work because we know it’s done right, from start to finish. As proud members of the Efficiency Excellence Network, we also ensure that your project meets rebate and code requirements, making your upgrade not only smart, but stress-free.
Ready to Choose the Right Insulation Material?
Whether your project calls for spray foam, cellulose, or a robust combination of both, Vermont Foam Insulation is here to help you get it right. Our team will evaluate your home, explain your options, and recommend the best insulation solution for your comfort, efficiency, and budget.
