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13 Best Insulation For Garage Walls (2023 Updated)

There are many different types of insulation available on the market, but the most common type of insulation for garage walls is fiberglass insulation. This type of insulation is made from glass fibers that are spun into a mat and then held together with a binder.

The mat is then placed between two sheets of paper or foil and pressed into shape. The finished product is then cut to fit the desired space.

Fiberglass insulation is a good choice for garage walls because it is an excellent insulator. It does not conduct heat or cold well, so it can help keep your garage at a comfortable temperature. It is also fire resistant and does not absorb moisture, so it will not promote the growth of mold or mildew.

13 Best Insulation For Garage Walls

Product Image Product Name Features Price

Reach Barrier 3009 Reflective Air Garage Door Insulation Kit

  • 100% Made in USA
  • Made of 20% recycled material
  • Meets or exceeds all ASTM standards

Reflectix Foil Insulation – 4' x 25' Roll

  • Product Type: Auto Accessory
  • Package Quantity: 1
  • Package Dimensions: 25.0 cms (L) x 25.0 cms (W) x 120.0 cms (H)

Reflectix Staple Tab Double Bubble Foil Insulation Roll, 16" x 25'

  • Reflective insulation for use in a crawl space, attic, wall, metal buildings and post and frame structures
  • Fiber free, environmentally safe, easy to install and lightweight

Reflectix BP24010 24 in. x 10 ft. Foil Insulation

  • Inhibits or eliminates condensation
  • Nontoxic/no carcinogenic
  • Does not require Protective clothing, goggles, or respirator

Frost King 16"X1"X48" Insulation CF1

  • Use for insulating, cushioning, and noise dampening
  • Safe alternative – no gloves, face mask, or goggles needed
  • Cut or rip to fit pipes and ducts, walls, and much more

Frost King 3 in. x 25 ft. Foil Backed Fiberglass Pipe Wrap Insulation

  • Simple, effective way to insulate pipes of all diameters
  • Ideal for overwrapping electric heat cables used to prevent water pipe freezing

Reflectix BP24025 24 in x 25 ft Bubble Pack Insulation

  • 24 in. X 25′

Reflectix 48 in. x 100 ft. Double Reflective Insulation

  • 48 in. X 100′

K Flex 6RXLO048158 – Insul Lock Self Seal 6'L, 1/2" Wall Thickness, 1 5/8" Nom. I.D

  • 6’L, 1-5/8 Inch / D, 1/2 Inch / Size: 74L X 2W X 2h

K-Flex USA 6Rsxg3X4068 Insulation Sheet,psa Back,36X48X3/4 in

  • 36x48x3/4 in

Rockwool Comfortbatt Stone Wool Insulation

  • 15.25 in W X 47 in L
Reach Barrier 3009 Reflective Air Garage Door Insulation Kit
  • 100% Made in USA
  • Made of 20% recycled material
  • Meets or exceeds all ASTM standards
Reflectix Foil Insulation – 4' x 25' Roll
  • Product Type: Auto Accessory
  • Package Quantity: 1
  • Package Dimensions: 25.0 cms (L) x 25.0 cms (W) x 120.0 cms (H)
Reflectix Staple Tab Double Bubble Foil Insulation Roll, 16" x 25'
  • Reflective insulation for use in a crawl space, attic, wall, metal buildings and post and frame structures
  • Fiber free, environmentally safe, easy to install and lightweight
Reflectix BP24010 24 in. x 10 ft. Foil Insulation
  • Inhibits or eliminates condensation
  • Nontoxic/no carcinogenic
  • Does not require Protective clothing, goggles, or respirator
Frost King 16"X1"X48" Insulation CF1
  • Use for insulating, cushioning, and noise dampening
  • Safe alternative – no gloves, face mask, or goggles needed
  • Cut or rip to fit pipes and ducts, walls, and much more
Frost King 3 in. x 25 ft. Foil Backed Fiberglass Pipe Wrap Insulation
  • Simple, effective way to insulate pipes of all diameters
  • Ideal for overwrapping electric heat cables used to prevent water pipe freezing
Reflectix BP24025 24 in x 25 ft Bubble Pack Insulation
  • 24 in. X 25′
Reflectix 48 in. x 100 ft. Double Reflective Insulation
  • 48 in. X 100′
K Flex 6RXLO048158 – Insul Lock Self Seal 6'L, 1/2" Wall Thickness, 1 5/8" Nom. I.D
  • 6’L, 1-5/8 Inch / D, 1/2 Inch / Size: 74L X 2W X 2h
K-Flex USA 6Rsxg3X4068 Insulation Sheet,psa Back,36X48X3/4 in
  • 36x48x3/4 in
Rockwool Comfortbatt Stone Wool Insulation
  • 15.25 in W X 47 in L

1. Reach Barrier 3009 Reflective Air Garage Door Insulation Kit

Reach Barrier 3009 Reflective Air Garage Door Insulation Kit

  • 100% Made in USA
  • Made of 20% recycled material
  • Meets or exceeds all ASTM standards
  • 2) layers of Reach Reflective Barrier
  • 2) layers of sealed air

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Product Details

Specifications

Details
actual length feet 48 ft
actual thickness inches 0.31
actual weight lbs 5
actual width inches 96
cover area per bag sq ft 48

2. Reflectix Foil Insulation – 4′ x 25′ Roll

Reflectix Foil Insulation - 4' x 25' Roll

  • Product Type: Auto Accessory
  • Package Quantity: 1
  • Package Dimensions: 25.0 cms (L) x 25.0 cms (W) x 120.0 cms (H)
  • Package Weight: 5.7 lbs

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Product Details

Specifications

Details
Assembled Depth (in) 10.0 in
Assembled Height (in) 48.0 in
Assembled Width (in) 10.0 in
Assembled Weight (lbs) 6 lbs
Package Weight 26

3. Reflectix Staple Tab Double Bubble Foil Insulation Roll, 16″ x 25′

Reflectix Staple Tab Double Bubble Foil Insulation Roll, 16

  • Reflective insulation for use in a crawl space, attic, wall, metal buildings and post and frame structures
  • Fiber free, environmentally safe, easy to install and lightweight
  • Air bubble lining resists transfer of heat
  • Non-toxic

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Specifications

Details
Assembled Depth (in) 10.0 in
Assembled Height (in) 16.0 in
Assembled Width (in) 10.0 in
Assembled Weight (lbs) 3 lbs
Package Weight 26
Coverage Area 33.33 ft²
Length 25 ft
Width 16 in
Thickness 0.3125 in
Material Reflective, Poly
Package Type Rolls
R Value 3.7
Recommended Fastener Staples
Recommended Safety Equipment Safety Glasses
Recommended Use Attics, Crawl Spaces, Walls, Radiant Flooring Systems, Ducts, Pipes and Water Heaters.
Type Staple Tab Reflective Insulation
Package Contents 1 Roll

4. Reflectix BP24010 24 in. x 10 ft. Foil Insulation

Reflectix BP24010 24 in. x 10 ft. Foil Insulation

  • Inhibits or eliminates condensation
  • Nontoxic/no carcinogenic
  • Does not require Protective clothing, goggles, or respirator

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Specifications

Details
Coverage Area 20 ft²
Length 10 ft
Width 24 in
Thickness 0.312 in
Material Metalized polyester, polyethylene
Package Type Rolls
R Value 4.7
Recommended Fastener Staples
Recommended Safety Equipment Safety goggles
Recommended Use hvac, attic, basement ceiling, hot water radiator, cathedral ceiling, crawl space, duct, garage door, knee wall, pipe wrap, radiant floor, wall, block wall, water heater, work shop
Type Reflective Insulation
Package Contents One roll of reflective insulation

5. Frost King 16″X1″X48″ Insulation CF1

Frost King 16

  • Use for insulating, cushioning, and noise dampening
  • Safe alternative – no gloves, face mask, or goggles needed
  • Cut or rip to fit pipes and ducts, walls, and much more

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Product Details

Specifications

Details
Self Sealing No
Maximum Pipe Size 16 in.
R Value 4
Product Type Pipe Wrap
Length 48 in.
Thickness 1 in.
Flexibility Flexible
Minimum Temperature 32 F
Maximum Temperature 100 F
Color Gray
Wall Thickness 1 in.
Brand Name Frost King

6. Frost King 3 in. x 25 ft. Foil Backed Fiberglass Pipe Wrap Insulation

Frost King 3 in. x 25 ft. Foil Backed Fiberglass Pipe Wrap Insulation

  • Simple, effective way to insulate pipes of all diameters
  • Ideal for overwrapping electric heat cables used to prevent water pipe freezing
  • Package dimensions value is 4″ h x 15″ l x 13.5″ w

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Specifications

Details
Product Type Pipe Insulation
Maximum Pipe Size 3 in.
Self Sealing No
Length 25 ft.
R Value 2.1

7. Reflectix BP24025 24 in x 25 ft Bubble Pack Insulation

Reflectix BP24025 24 in x 25 ft Bubble Pack Insulation

  • 24 in. X 25′

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Product Details

Specifications

Details
Assembled Depth (in) 10 in
Assembled Height (in) 24 in
Assembled Width (in) 10 in
Assembled Weight (lbs) 3 lbs
Package Weight 26

8. Reflectix 48 in. x 100 ft. Double Reflective Insulation

Reflectix 48 in. x 100 ft. Double Reflective Insulation

  • 48 in. X 100′

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Do it Best
Valu Home Centers

Product Details

Specifications

Details
Energy Star Certified Yes
Width 48 in.
Thicknes 5/16 in.
R Value R-3.7 to R-21
Facing Reflective

9. Reflex-AIR Single Bubble Wrap Insulation 48-Inch (500 SF)

Reflex-AIR Single Bubble Wrap Insulation 48-Inch (500 SF)

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RadiantGUARD

Product Details

Specifications

Details
Reflectivity (ASTM E903) 95%
Emissivity (ASTM C1371) 5%
Nominal Thickness 3/16 inch
Average Tensile Strength 124.21 lb/in2
Average Tear Strength 5.37 lbs

Reviews From Real Customers

Billie J
Linda F
tundra1gary

10. K Flex 6RXLO048158 – Insul Lock Self Seal 6’L, 1/2″ Wall Thickness, 1 5/8″ Nom. I.D

K Flex 6RXLO048158 - Insul Lock Self Seal 6'L, 1/2

  • 6’L, 1-5/8 Inch / D, 1/2 Inch / Size: 74L X 2W X 2h

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Zoro

Product Details

Specifications

Details
Flame Spread Up to 1/2\ Not Greater Than 25
Nominal Inside Diameter 1-5/8 in
Smoke Developed Up to 1/2\ Not Greater Than 50
Wall Thickness 1/2 in
Length 6 ft

11. Unitherm R-5,Unfaced,Ceramic Fiber Insulation Blanket Roll 2″ x 24″ x 50″

Unitherm R-5,Unfaced,Ceramic Fiber Insulation Blanket Roll 2

Product Details

Specifications

Details
Insulation R-Value R5
Faced or Unfaced Unfaced
Roll or Batt Roll
Product Thickness (in.) 2 in
Pack Size 1

12. K-Flex USA 6Rsxg3X4068 Insulation Sheet,psa Back,36X48X3/4 in

K-Flex USA 6Rsxg3X4068 Insulation Sheet,psa Back,36X48X3/4 in

  • 36x48x3/4 in

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Zoro

Product Details

Specifications

Details
Insulation Body Material NBR/PVC
Wall Thickness – Insulation 3/4 in
Insulation Sheet Size 36 in x 48 in
Insulation Temp. Range -297 Degrees F to 220 Degrees F
Insulation Approx. R Value 3.0

13. Rockwool Comfortbatt Stone Wool Insulation

Rockwool Comfortbatt Stone Wool Insulation

  • 15.25 in W X 47 in L

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The BuildClub

Product Details

Specifications

Details
Product Thickness (in.) 5.5 in
Insulation R-Value R23
Bag Size 4 ft. x 16 in. x 24 in.
Batt/Roll Size 4 ft. x 5.5 in. x 15.25 in.
Compatible Install Surface Wood

Conclusion

The most important factor to consider when insulating garage walls is the R-value. The R-value is a measure of how well the insulation will resist heat flow. The higher the R-value, the better the insulation will be at resisting heat flow.

The R-value of most garage walls is between R-13 and R-15. This means that the insulation will be effective at reducing heat loss in the winter and heat gain in the summer. Another important factor to consider when insulating garage walls is the type of insulation.

There are two types of insulation that are commonly used in garages: fiberglass and cellulose. Fiberglass is the most common type of insulation used in garages. It is made from recycled glass and is available in rolls or batts.

Cellulose insulation is made from recycled paper products and is available in loose-fill or blown-in form. Cellulose insulation has a higher R-value than fiberglass insulation and is also more fire resistant.

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