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20 Best Insulation For Under Floors (2023 Updated)

Insulation for under floors is a material that is used to prevent heat from escaping through the floor. There are many different types of insulation, but the most common type is fiberglass. Fiberglass is made from recycled glass and is very effective at keeping heat in.

Other types of insulation include spray foam, cellulose, and foil-faced insulation.

20 Best Insulation For Under Floors

Product Image Product Name Features Price

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)

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

Reflectix BP24010 24 in. x 10 ft. Foil Insulation

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

Reflectix Foil Insulation 16"X50'

  • Size: 16 x 50 ft.
  • Coverage Area: 67 sq. ft.
  • Great Gift Idea.

Under Carpet Lite Sound Absorption & Insulation Material (24" x 54"

  • Comfortable interior at any temperature
  • Quick and easy installation
  • Enhances stereo performance and sound

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

Bestlaminate 3in1 Basic Vapor Barrier Flooring Underlayment W Overlap and Tape …

  • Price per 100 sq.ft roll.
  • 2mm 3in1 Construction. With a pre-attached self-sealing tape strip and plastic overlap, installation is a breeze!

Non-Slip Thermal Insulation Pad for Rug HEAT, Size 2'2" x 3'2", Fits Under A 2' x 3' Rug

  • Size 2’2″ X 3’2″ / A 2′ X 3′

Reflectix BP24025 24 in x 25 ft Bubble Pack Insulation

  • 24 in. X 25′

Shaw Floors Selitac Underlayment (100 sq.ft./roll)

  • End to End: 300 Overall Width.
  • Side to Side: 48 Overall Thickness: 0.

Reflectix 48 in. x 100 ft. Double Reflective Insulation

  • 48 in. X 100′

Unitherm Ceramic Fiber Insulation Blanket Roll, 8#Density, 2300f, 1"x24"x60"

  • 1″x24″x60″

Rockwool Comfortbatt Stone Wool Insulation

  • 15.25 in W X 47 in L

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

  • 36x48x3/4 in

Roxul 40320 Insulation,wool,0 to 1200 degreesF

  • 4 / 1 in
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)
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
Reflectix BP24010 24 in. x 10 ft. Foil Insulation
  • Inhibits or eliminates condensation
  • Nontoxic/no carcinogenic
  • Does not require Protective clothing, goggles, or respirator
Reflectix Foil Insulation 16"X50'
  • Size: 16 x 50 ft.
  • Coverage Area: 67 sq. ft.
  • Great Gift Idea.
Under Carpet Lite Sound Absorption & Insulation Material (24" x 54"
  • Comfortable interior at any temperature
  • Quick and easy installation
  • Enhances stereo performance and sound
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
Bestlaminate 3in1 Basic Vapor Barrier Flooring Underlayment W Overlap and Tape …
  • Price per 100 sq.ft roll.
  • 2mm 3in1 Construction. With a pre-attached self-sealing tape strip and plastic overlap, installation is a breeze!
Non-Slip Thermal Insulation Pad for Rug HEAT, Size 2'2" x 3'2", Fits Under A 2' x 3' Rug
  • Size 2’2″ X 3’2″ / A 2′ X 3′
Reflectix BP24025 24 in x 25 ft Bubble Pack Insulation
  • 24 in. X 25′
Shaw Floors Selitac Underlayment (100 sq.ft./roll)
  • End to End: 300 Overall Width.
  • Side to Side: 48 Overall Thickness: 0.
Reflectix 48 in. x 100 ft. Double Reflective Insulation
  • 48 in. X 100′
Unitherm Ceramic Fiber Insulation Blanket Roll, 8#Density, 2300f, 1"x24"x60"
  • 1″x24″x60″
Rockwool Comfortbatt Stone Wool Insulation
  • 15.25 in W X 47 in L
K-Flex USA 6Rsxg3X4068 Insulation Sheet,psa Back,36X48X3/4 in
  • 36x48x3/4 in
Roxul 40320 Insulation,wool,0 to 1200 degreesF
  • 4 / 1 in

1. DRICORE 1 in. x 2 ft. x 2 ft. Aspen Insulated Panel

DRICORE 1 in. x 2 ft. x 2 ft. Aspen Insulated Panel

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Amazon.com – Seller

Product Details

Specifications

Details
Exposure Durability Interior
Plywood Features Tongue and Groove
Shape Square
Actual Product Length (in.) 23.25
Actual Product Thickness (in.) 1
Actual Product Width (in.) 23.25
Nominal Product Length (ft.) 2
Nominal Product Thickness (in.) 1
Nominal Product Width (ft.) 2

Reviews From Real Customers

AEDy
JayS

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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Amazon.com
eBay
Walmart
Lowe’s

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. 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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Amazon.com
Walmart
Home Depot
Ace Hardware

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

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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Amazon.com
eBay
Walmart
Ace Hardware

Product Details

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. Reflectix Foil Insulation 16″X50′

Reflectix Foil Insulation 16

  • Size: 16 x 50 ft.
  • Coverage Area: 67 sq. ft.
  • Great Gift Idea.
  • Satisfaction Ensured.

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Amazon.com – Seller
eBay
Walmart
Max Warehouse

Product Details

Specifications

Details
Coverage Area 67 sq ft
Length 50 ft.
Width 16 in.
R Value R-3.7 to R-21
Insulation Type Radiant Barrier

6. Under Carpet Lite Sound Absorption & Insulation Material (24″ x 54″

Under Carpet Lite Sound Absorption & Insulation Material (24

  • Comfortable interior at any temperature
  • Quick and easy installation
  • Enhances stereo performance and sound
  • Economical insulating solution
  • Light-weight for high performance applications

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Amazon.com
eBay
Walmart
SonicElectronix.com

Product Details

Specifications

Details
Length 25.8 in
Height 6.2 in
Width 6.2 in
Product Weight
Weight 3.4 lb

Reviews From Real Customers

MARTY
MrEman985

7. 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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Amazon.com – Seller
eBay
Walmart
Lowe’s

Product Details

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

8. Bestlaminate 3in1 Basic Vapor Barrier Flooring Underlayment W Overlap and Tape …

Bestlaminate 3in1 Basic Vapor Barrier Flooring Underlayment W Overlap and Tape ...

  • Price per 100 sq.ft roll.
  • 2mm 3in1 Construction. With a pre-attached self-sealing tape strip and plastic overlap, installation is a breeze!
  • Suitable for wood and cement subfloors.
  • Great for laminate & engineered floating floors.
  • Fast & Free Fedex Ground.

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Amazon.com – Seller
Bestlaminate

Product Details

Specifications

Details
Thickness 2mm
Underlayment Type Silent (3in1)
Construction 3in1
Suitable for Subfloor All Subfloor Types
Suitable For Floors Laminate
Roll Width 44 in
Roll Length 30.5 ft

Reviews From Real Customers

trustedwhitey
dkcj4
jedikuo999

9. SilveRboard 24 in. x 1 in. x 48 in. R5 Radiant Acoustic Insulation Kit – STC 19 …

SilveRboard 24 in. x 1 in. x 48 in. R5 Radiant Acoustic Insulation Kit - STC 19 ...

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Amazon.com – Seller
eBay
Home Depot
The BuildClub

Product Details

Specifications

Details
Product Thickness (in.) 1 in
Insulation R-Value R5
Faced or Unfaced Faced
Insulation Features Formaldehyde Free,Vapor Retardant
Insulation Type Foam Board Insulation
Interior/Exterior Interior/Exterior
Number of Pieces 12
Pack Size 12
Sheathing Size 2 ft. x 1 in. x 48 in.
Sheathing Type EPS
Cover Area Per Bag (sq. ft.) 96 ft²
Coverage Area (sq. ft.) 96 ft²
Product Length (ft.) 2 ft
Product Width (in.) 48 in

10. Non-Slip Thermal Insulation Pad for Rug HEAT, Size 2’2″ x 3’2″, Fits Under A 2′ x 3′ Rug

Non-Slip Thermal Insulation Pad for Rug HEAT, Size 2'2

  • Size 2’2″ X 3’2″ / A 2′ X 3′

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Amazon
CozyWinters.com

Product Details

Reviews From Real Customers

V3
Martin W
MH

11. 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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Amazon
eBay
Walmart – 4Wheel Online
Lowe’s

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

12. Shaw Floors Selitac Underlayment (100 sq.ft./roll)

Shaw Floors Selitac Underlayment (100 sq.ft./roll)

  • End to End: 300 Overall Width.
  • Side to Side: 48 Overall Thickness: 0.

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Amazon
Wayfair

Product Details

Specifications

Details
Assembled Product Dimensions (L x W x H) 2.00 x 3.00 x 4.00 Inches

Reviews From Real Customers

kelticgreen
Tina
davinewb_26

13. 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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Amazon
The BuildClub
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

14. Unitherm Ceramic Fiber Insulation Blanket Roll, 8#Density, 2300f, 1″x24″x60″

Unitherm Ceramic Fiber Insulation Blanket Roll, 8#Density, 2300f, 1

  • 1″x24″x60″

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Amazon
eBay
Home Depot
CP Lab Safety

Product Details

Specifications

Details
Size 1 Inch

Reviews From Real Customers

Frank

15. DRICORE Insul-Armor 80-sq ft Premium 1-in Flooring Underlayment | FG10038

DRICORE Insul-Armor 80-sq ft Premium 1-in Flooring Underlayment | FG10038

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Amazon
The BuildClub

Product Details

Specifications

Details
Coverage Area (Sq. Feet) 80
For Use with Laminate Yes
Moisture Resistant Yes
Mold/Mildew Resistant Yes
Cushioning Yes

Reviews From Real Customers

Davidgww
Gunner
Candi B

16. Rockwool Comfortbatt Stone Wool Insulation

Rockwool Comfortbatt Stone Wool Insulation

  • 15.25 in W X 47 in L

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Home Depot
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

17. Rockwool Comfortbatt Stone Wool Insulation RXCB3023

Rockwool Comfortbatt Stone Wool Insulation RXCB3023

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Lowe’s
Instacart

Product Details

18. Rockwool Comfortboard 80 R- 6 Wall 48-sq ft Unfaced Stone Wool Batt Insulation (24-in W x 48-in L) | RXCB11224

Rockwool Comfortboard 80 R- 6 Wall 48-sq ft Unfaced Stone Wool Batt Insulation (24-in W x 48-in L) | RXCB11224

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Lowe’s
Home Depot

Product Details

Specifications

Details
R-Value per Inch 4
Package Quantity 6
For Use in Garage Doors No
Package Weight (lbs.) 48
Width (Inches) 24

19. 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

20. Roxul 40320 Insulation,wool,0 to 1200 degreesF

Roxul 40320 Insulation,wool,0 to 1200 degreesF

  • 4 / 1 in

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Grainger Industrial Supply
SupplyApp.com
Zoro

Product Details

Specifications

Details
Approx. R Value 4
Thickness 1 in
Density 8#
Temp. Range 0 Degrees F to 1200 Degrees F
Length 48 in

Conclusion

The most important factor in deciding whether to insulate your under floor is the climate. If you live in an area with warm weather, you may not need to insulate at all. However, if you live in an area with cold weather, you will want to insulate your under floor to keep your home warm.

There are many different types of insulation, so you will need to decide which one is right for you. The most common type of insulation is fiberglass, but there are also other options, such as cellulose and foam.

You will also need to decide how much insulation you need. The amount of insulation you need will depend on the climate, the size of your home, and the type of insulation you choose.

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