Types of Insulation for Homes in St. George, UT

Choosing the right type of insulation for your home isn’t just about comfort; it’s about energy efficiency, long-term savings, and protecting your property from Utah’s cold winters. Whether you’re building new, remodeling, or upgrading outdated insulation, understanding your options is the first step.

At Big City Insulation Utah, we help homeowners in St. George and surrounding areas select and install the best insulation for their needs. Let’s explore the most common types of insulation and where they work best. 

Fiberglass Insulation 

Best for: Attics, walls, crawl spaces
R-value range: R-11 to R-38
Installation: Batts, rolls, or loose fill

Fiberglass is one of the most widely used insulation materials. It’s affordable, effective, and available in pre-cut batts, rolls, or loose-fill that we blow in. It works well in open areas, including attics and unfinished walls

Spray Foam Insulation 

Best for: Walls, attics, crawl spaces
R-value range: R-3.5 to R-6.5 per inch
Installation: Sprayed into place, expands to seal gaps

Spray foam offers superior air sealing and moisture resistance. It’s more expensive but delivers excellent thermal performance and is ideal for hard-to-reach areas

Rigid Foam Board Insulation 

Best for: Exterior walls, basements, foundations
R-value range: R-4 to R-6.5 per inch
Installation: Panels cut to fit

Rigid foam boards are durable and moisture-resistant, making them ideal for exterior applications and below-grade areas. They’re often used in combination with other insulation types. 

Mineral Wool (Rock Wool) Insulation 

Best for: Walls, ceilings, floors
R-value range: R-3.0 to R-3.3 per inch
Installation: Batts or boards

Mineral wool is fire-resistant and excellent for soundproofing. It’s a great choice for interior walls and multi-family homes where noise reduction is a priority. 

Insulation Comparison Table 

Which Insulation Works Best in St. George, UT? 

Southern Utah’s climate includes hot summers and cool winters, so insulation needs to perform well across temperature extremes. Spray foam and radiant barriers are especially effective here, but the best solution often involves a combination of materials.

Our team will assess your home’s structure, age, and energy goals to recommend the right mix, including any removal or replacement of existing insulation.

Why Choose Big City Insulation Utah 

• Local expertise in St. George and the surrounding areas 

• Free in-home insulation assessments 

• Licensed and insured professionals 

• Clean, efficient installation 

• Over 50 years in business. 

Get a Free Insulation Assessment 

Not sure which insulation is right for your home? Let us help. Fill out our form to schedule your free consultation with Big City Insulation Utah

Insulation FAQ

What are the most common types of insulation used in Utah homes?

Utah homeowners often choose fiberglass, spray foam, rigid foam board, and mineral wool insulation. Each type offers different benefits depending on your budget, moisture concerns, and the area of your home being insulated.

Which Types of insulation are best for Utah’s climate?

Spray foam and rigid foam board are excellent for Utah’s varied climate. Spray foam offers superior air sealing for cold winters, while rigid foam board works well in basements and exterior walls to combat both heat and cold.

How do I know if my home needs more insulation?

Signs include high energy bills, uneven room temperatures, drafts, and ice dams in winter. Homes built before 1980 often lack sufficient insulation and may benefit from an upgrade.

What is R-value, and why is it important in Utah?

R-value measures insulation’s resistance to heat flow. In Utah, where temperatures vary widely, choosing insulation with a higher R-value ensures better energy efficiency and indoor comfort year-round.

Can insulation help lower my energy bills in Utah?

Proper insulation can reduce heating and cooling costs by up to 30 – 40%, especially in Utah’s extreme seasonal temperatures.

Is spray foam insulation worth the investment for Utah homes?

Spray foam offers high R-values and excellent moisture resistance, making it ideal for crawl spaces and walls in Utah. While it can be more expensive upfront, it provides long-term energy savings and durability.