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18 Best Insulation For Floor Joists (2023 Updated)

Insulation for floor joists is insulation that is installed between the floor joists in a home. This insulation helps to keep the heat in the home from escaping through the floor. It is important to choose the right type of insulation for your home and to install it properly in order to achieve the best results.

18 Best Insulation For Floor Joists

Product Image Product Name Features Price

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

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 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 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.

John Manville 90007903 R38 24 x 48 in Unfaced Batt

  • 24″x48″

Roxul 40260 Insulation,wool,foil Backing

  • 1 in X 48 in X 24 in

Loctite Tite Foam – 12 oz

  • Polymer-based foam that delivers premium durability and insulation that withstands the elements
  • Expands to fill seal and insulate effectively around gaps and cracks up to 1 in. in size

Unitherm Ceramic Fiber Insulation Blanket R-Value: 2.27, 6#Density, 2300 F, 1" x 24" x 25'

  • 1″x24″x25′

Roxul 40320 Insulation,wool,0 to 1200 degreesF

  • 4 / 1 in
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
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 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 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.
John Manville 90007903 R38 24 x 48 in Unfaced Batt
  • 24″x48″
Roxul 40260 Insulation,wool,foil Backing
  • 1 in X 48 in X 24 in
Loctite Tite Foam – 12 oz
  • Polymer-based foam that delivers premium durability and insulation that withstands the elements
  • Expands to fill seal and insulate effectively around gaps and cracks up to 1 in. in size
Unitherm Ceramic Fiber Insulation Blanket R-Value: 2.27, 6#Density, 2300 F, 1" x 24" x 25'
  • 1″x24″x25′
Roxul 40320 Insulation,wool,0 to 1200 degreesF
  • 4 / 1 in

1. 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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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

2. 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

3. 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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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

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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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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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. 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

7. 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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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

8. John Manville 90007903 R38 24 x 48 in Unfaced Batt

John Manville 90007903 R38 24 x 48 in Unfaced Batt

  • 24″x48″

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The BuildClub
Toolbox Supply

Product Details

Specifications

Details
Coverage Area (Sq. Feet) 64
Fits 2 x 4 Walls No
For Use in Electrical No
R-Value per Inch 2.923
For Use in Duct No

Reviews From Real Customers

PMJ1

9. Ceramic Fiber Insulation,6 Cu. Ft./Lb., Size: 24 in

Ceramic Fiber Insulation,6 Cu. Ft./Lb., Size: 24 in

Product Details

10. Roxul 40260 Insulation,wool,foil Backing

Roxul 40260 Insulation,wool,foil Backing

  • 1 in X 48 in X 24 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

11. Loctite Tite Foam – 12 oz

Loctite Tite Foam - 12 oz

  • Polymer-based foam that delivers premium durability and insulation that withstands the elements
  • Expands to fill seal and insulate effectively around gaps and cracks up to 1 in. in size
  • High density foam with a uniform cell structure for durability and overall insulation for your remodeling needs
  • Superior flexibility withstands building and material movement without compromising its seal
  • Strong adhesion and bonds to most building materials like wood concrete brick stone metal pvc and more

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Product Details

Specifications

Details
Units in Package 1
Unit Size 12 oz
Directions How to use? Shake vigorously for 30 seconds. Screw straw into valve. Squeeze trigger to dispense foam. 1. Always wear eye protection, gloves and proper work clothing when using foam. Cured foam is difficult to remove from skin, clothing and other substrates. 2. For optimum performance shake can intermittently during extended use. 3. Make sure surface is clean and free from dirt, dust, and other substances. Cover surfaces not intended to be foamed. 4. Dispense foam sparingly: Fill void by half to avoid overflows. 5. Mist with water to speed cure. 6. If necessary, cured foam can be trimmed with a knife after 1 hour. 7. Clean spills immediately with acetone. Refer to TDS for detailed instructions.
Warnings Danger! Extremely flammable. Vapor may cause flash fire. Vapor and spray mist harmful, overexpose may cause lung damage. May cause allergic respiratory and skin reaction. Contents under pressure. Read back panel carefully for other cautions. Contains polyurethane prepolymer, methylenediphenyldiisocyanate polymer, diphenylmethanediisocyanate, dimethylether and hydrocarbon propellant mixture. Do not use near sparks, heat or open flame. Vapors will accumulate readily and may ignite explosively. Ventilate area during use and until all vapors are gone. Do not smoke. Extinguish all ignition sources. If burned, dried foam may release hazardous decomposition products. Dried foam may be combustible if exposed to flame or temperatures above 240 degrees F. Avoid prolonged exposure to sunlight or heat from radiators, stoves, hot water and other heat sources that may cause bursting. Do not puncture, incinerate, burn or store above 120 degrees F. Do not discard empty can in garbage compactor. Gives off harmful vapor of solvents and isocyanates. Do not use if you have chronic lung or breathing problems, or if you have ever had a reaction to isocyanates. Use with adequate ventilation. Use appropriate respiratory protection when potential to exceed exposure limits exist. If you have breathing problems during use, leave the area and get fresh air. If symptoms develop or persist, call a doctor or obtain medical treatment; have this label with you. Eye and skin irritant. Avoid contact with eyes and skin. Prolonged or repeated skin contact may lead to sensitization and dermatitis. Wash hands after using. Do not swallow. Intentional misuse by deliberately concentrating and inhaling the contents may be harmful or fatal. First Aid: For eye contact flush with water for 15 minutes. Call a physician if irritation develops and persists. For skin contact, wipe off excess uncured foam with clean rag or paper towel immediately. Get medical attention if irritation develops and persists. If affected by inhalation, remove to fresh air and contact a physician. If swallowed, do not induce vomiting. Call a physician or Poison Control Center immediately. Keep out of reach of children.

Reviews From Real Customers

William Su
Builder
boomroomba

12. Roxul 1-1/2″ x 48″ x 24″ Mineral Wool High Temperature Insulation, Density 8#

Roxul 1-1/2

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Product Details

13. Johns Manville R38 Unfaced Fiberglass Insulation Batt U361S

Johns Manville R38 Unfaced Fiberglass Insulation Batt U361S

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Product Details

Specifications

Details
Fits 2 x 6 Walls No
For Use in Doors No
For Use in Electrical No
For Use in Masonry No
R-Value per Inch 2.923

14. Unitherm Ceramic Fiber Insulation Blanket R-Value: 2.27, 6#Density, 2300 F, 1″ x 24″ x 25′

Unitherm Ceramic Fiber Insulation Blanket R-Value: 2.27, 6#Density, 2300 F, 1

  • 1″x24″x25′

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Product Details

Specifications

Details
Wall Thickness (Inches) 1
Fits Pipe Diameter (Inches) 0
Application HVAC
Length (Feet) 25
Cut to Length Yes

15. Rockwool Comfortbatt Stone Wool Insulation

Rockwool Comfortbatt Stone Wool Insulation

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Product Details

Specifications

Details
Brand Name Rockwool
Length 47 in.
Facing Unfaced
R Value R15
Product Type Insulation
Roll or Batt Batt
Thickness 3.5 in.
Number in Package 1 pk
Coverage Area 59.7 sq ft
Width 15.25 in.

16. Primesource – Roxul RXCB3523 R15 23×47 Bat Insulation

Primesource - Roxul RXCB3523 R15 23x47 Bat Insulation

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Product Details

Specifications

Details
Assembled Product Weight 0 oz

17. Rockwool Comfortbatt Stone Wool Insulation RXCB3023

Rockwool Comfortbatt Stone Wool Insulation RXCB3023

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18. 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
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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

There are many benefits to insulating floor joists, including reducing energy costs, improving comfort, and reducing noise levels. However, there are a few things to keep in mind when insulating floor joists.

First, make sure that the insulation is the proper thickness for the joist width. Second, be sure to seal any gaps or cracks around the joists to prevent air leakage. Finally, consider using a vapor barrier to prevent moisture from damaging the insulation.

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