The R-Value Explained: Why It Matters for Your Insulation

When it comes to insulation, homeowners are often told to "look at the R-value." But what does that really mean? At Custom Insulation Company, Inc., we believe in helping our customers make informed decisions, and understanding R-value is key to choosing the right insulation for your home.

What Is R-Value?

R-value measures how well a material resists heat flow—essentially, how good it is at insulating. The higher the R-value, the greater the material’s insulating power. This means better energy efficiency, more consistent indoor temperatures, and lower utility bills.

Think of it like wearing a coat: a thicker, better-insulated coat (higher R-value) keeps you warmer in the winter. The same principle applies to your home.

Why R-Value Matters

Here in Massachusetts, we deal with cold winters and hot summers. Proper insulation helps maintain a comfortable indoor environment year-round, reducing the strain on your HVAC system and keeping energy costs in check.

• In winter: Higher R-values help keep warm air inside.
• In summer: It keeps the heat out, so your AC doesn’t work overtime.
• All year: You’ll notice fewer drafts, more comfort, and more consistent indoor temperatures.

What R-Value Do You Need?

The recommended R-value depends on your home's location, age, and specific area being insulated (attic, walls, basement, etc.). In New England, here are some general guidelines:

• Attics: R-38 to R-60
• Walls: R-13 to R-21
• Floors over unheated spaces: R-25 to R-30

Our team at Custom Insulation can assess your home and help you choose the right insulation to meet or exceed these recommendations.

Spray Foam and R-Value

Spray foam insulation, one of our specialties, offers some of the highest R-values per inch compared to other materials.

• Closed-cell spray foam: R-6 to R-7 per inch
• Open-cell spray foam: R-3.5 to R-4 per inch

Beyond R-value, spray foam also seals air leaks, adds structural support, and helps with moisture control—a triple win for your home.

Let’s Maximize Your Home’s Efficiency

If you’re wondering whether your insulation is doing its job, or you're planning a new build or remodel, understanding R-value is just the first step. At Custom Insulation Company, Inc., we’re here to help you make the best choice for long-term comfort and savings.