10 Best Insulation For Crawl Spaces 2021

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

Crawl Space Vent Cover – ⭐ Best Overall Insulation For Crawl Space

CECOMINOD043182 by Crawl Space Door Systems

  • Color: Black
  • Weight: 0.5 pounds
  • Dimensions: 18 x 10 x 0.5 inches
Crawl Space Vent Cover
  • SURFACE MOUNTED: Attaches to outside of crawl space foundation wall over 8"x16" openings with screws or adhesive (not included).
  • SOLID ABS PLASTIC VENT COVER: Won't rust or rot! Does not go into the opening. Mounts over the opening.
  • DOES NOT OPEN OR CLOSE: This is a solid piece vent cover for enclosed, encapsulated, or conditioned crawl spaces.
  • INSTALLATION: Designed to be mounted over standard 8" height x 16" width crawl space openings. Screw directly into foundation wall with a 1/4" masonry bit or construction grade adhesive.
  • PAINTABLE: May be painted with a plastic adherent paint. Crawl space vent cover can be insulated by gluing insulation inside the cover.

1000sqft NASATECH (6 Mil Reinforced Scrim) White/Foil (Waterproof) Vapor Barrier

by AES

  • Dimensions: 48 x 5 x 5 inches
1000sqft NASATECH (6 Mil Reinforced Scrim) White/Foil (Waterproof) Vapor Barrier
  • Includes all of the same benefits and advantages as a traditional radiant barrier with the solid white coating
  • Made in USA / SHIPS from USA
  • Corrosive resistant / wont oxidize / waterproof / heavy duty commercial and residential
  • UV Inhibitor added / Eliminates “Black-Globe-Effect” / Allows for easier and quicker installation.
  • Solid White Vinyl Side / Foil Side Super Duty Waterproof / Heavy Duty Scrim

Blue Summit Supplies Vapor Barrier Tape – 💲 Best Budget Insulation For Crawl Space

BSS-92588-420 by Blue Summit Supplies

  • Color: White
Blue Summit Supplies Vapor Barrier Tape
  • Our 9 mil, 3.78 inch wide vapor barrier seam tape was developed to be high performance, durable, moisture resistant and manufactured to withstand the most demanding conditions
  • Designed to bind seams of PE films and sealing moisture barriers to encapsulate your a crawl space, vapor barrier tape bonds well to a variety of surfaces with a synthetic rubber-based pressure-sensitive adhesive designed to offer high conformability without excessive stretch
  • Our 9mm PE white crawl space seam tape is ideal for abatement and restoration, marine and boat preservation or shrink wrap, outdoor masking and stucco application/painting, as well as a sealing tape for building or underlayment purposes
  • This durable, waterproof insulation white plastic tape is great for patching and repairs, bundling and housewrap applications, sealing, and separation of dissimilar metals, and more.
  • Durable, moisture resistant PE (polyethylene) film backing features an extremely sticky permanent adhesive for poly liners and plastic-to-plastic vapor barrier adherence, making this white seam tape a great choice for creating a dust barrier, crawl space liner, and more

(48inch x 75ft) NASATECH White/Foil Double Bubble (XTemp) Reflective Insulation

4x1oo by US Energy Products

  • Dimensions: 48 x 5 x 5 inches
(48inch x 75ft) NASATECH White/Foil Double Bubble (XTemp) Reflective Insulation
  • This product consists of two 99.97% Reflective Layers of Metalized Film bonded to two internal layers of heavy gauge polyethylene bubbles (Poly-Air) (nominal thickness 5/16”).
  • Reflective metalized solid (white faced) insulation vapor barrier for Automitive, warehouse ceilings and walls, concrete flooring, and inside concrete slabs
  • Not affected by moisture or humidity. Inhibits condensation and does not promote the growth of fungi, mold or mildew. Does not promote nesting of insects or rodents.
  • Class 1 Class A Fire Rated (Meets all USA and Intl Fire Codes)
  • Made in USA / Ships from USA / Nominal thickness is 1/4 inch / R8

XFasten Construction Seaming Tape Red

CSTR355 by XFasten

  • Color: Red
  • Dimensions: 5.1 x 5.1 x 11.8 inches
XFasten Construction Seaming Tape Red
  • INDUSTRIAL GRADE AND ALL-WEATHER red construction seaming tape that provides extreme tack and sealing to vapor barrier film seams, house wrap seams, foam insulation boards, crawl spaces and joints.
  • PREVENTS LENGTH-WISE SPLITTING. Are you tired of getting vapor barrier tapes that just split lengthwise while being unspooled from the roll? The XFasten house wrap sheathing tape has a fiberglass sheathing tape backing that prevents it from unnecessary curling, breaking, or splitting lengthwise allowing for zero delays and fast operation on construction and renovation projects.
  • WATERPROOF AND HUMIDITY-RESISTANT. The underlayment tape’s waterproof adhesive prevents bubble formation due to moisture and humidity. Due to its high resistance against humidity, it works best as a crawlspace seam tape for seaming, edge-taping and electrical box-trimming.
  • EXTREME ADHESION. Thanks to its silicone-butyl adhesive composite, the XFasten construction sheathing tape sticks well for months without falling off, especially on rigid foam board insulation, house wrap, vapor barrier film, polyethylene sheets and greenhouse tarp.
  • DESIGNED TO TAKE A BEATING. This crawlspace vapor barrier tape does not degrade under extreme heat or low temperatures (-4°F to 203°F). Resistant to UV, sunlight, rainfall and snowy weather. It is also puncture and abrasion resistant—enabling the AVERAGE AMERICAN HOMEOWNER who HAS LITTLE TO NO EXPERIENCE IN HOME BUILDING to achieve PROFESSIONAL-GRADE repair both in looks and functionality.

Durablow Air-In Stainless Steel Crawl Space Foundation Dual Fans Ventilator

MFB M2D-S430-N (ZF) by Durablow

  • Weight: 4 pounds
  • Dimensions: 20 x 15 x 5 inches
Durablow Air-In Stainless Steel Crawl Space Foundation Dual Fans Ventilator
  • ▼ Air In ▼ Dimensions L x W x H: 18” x 9” x 2”. ▼ Seven Leaves AC Axial Fan. (Dual fans with power cord).
  • ▼ Freeze protection thermostat. ▼ UL listed components used. ▼ Measure your crawl space vent opening size before purchasing.
  • ▼ Benefits: 1. Reduces moisture in crawl spaces / foundation to protect home and occupants. 2. Increases air circulation to prevent condensation and wood rot. 3. Exhausts vent radon gas, treated wood gases and odors, prevents migrating into living areas. 4. Exchange the outdoor and indoor air, improve room air quality and balance the humidity.
  • ▼ It helps to reduce radon level in crawl space, since radon (density) is heavier than air, radon will precipitate in lower floors. ▼ 100% Stainless Steel 430 Grade panel & housing box for longer life in humid environment. (Better than other brands' Galvanized Steel.)

RadiantGUARD Reflex-AIR PRO Single Bubble Reflective Insulation Roll (500 sq

RG-RSBR-48-125-SQ by RadiantGUARD

  • Color: Silver
  • Weight: 18 pounds
  • Dimensions: 48 x 17 x 17 inches
RadiantGUARD Reflex-AIR PRO Single Bubble Reflective Insulation Roll (500 sq
  • PRODUCT OVERVIEW: 100% Made in USA. High quality industrialized PROFESSIONAL line of reflective bubble foil insulation for use as metal building, post frame and pole barn insulation, agricultural and poultry barn insulation, home insulation for basement, duct insulation wrap, garage door insulation, greenhouse thermal insulation, as a vapor barrier for crawlspace for crawl space encapsulation, rv insulation for rv skirting for winter and as a mobile home underbelly material.
  • SIZE: 500 square feet roll (48 inch wide by 125 linear feet). THICKNESS: 3/16 inch nominal. WEIGHT: 17 pounds. Puncture / Tear resistant. Will not compress or disintegrate. As a foil vapor barrier, this reflective barrier foil faced insulation roll blocks the transfer of moisture vapor and reduced the chance of condensation.
  • ECO-FRIENDLY: Industrialized encapsulated single layer air bubble insulation. This insulating bubble foil is NOT gas-injected FOAM. Mylar bubble wrap insulation roll is non-toxic, non-carcinogenic, fiber free and does not require special protective clothing to install.
  • FIRE RATING: Class A / Class 1 - This reflective foil bubble insulation meets fire and smoke requirements for most local, state and federal building codes
  • WARRANTY: 10-YEAR written warranty. Detailed product specifications available.

NASATEK Double Bubble White/Foil Reflective Insulation (500sqft = 48ft Wide – 👑 Premium Pick

4x1oo by US Energy Products

NASATEK Double Bubble White/Foil Reflective Insulation (500sqft = 48ft Wide
  • Product consists of two 99.97% Reflective Layers of Metalized Film bonded to two internal layers of heavy gauge polyethylene bubbles (1/4inch Thick)
  • Double Bubble White/Foil Reflective Insulation is 1/4" thick and is designed for walls, basements, crawl spaces, metal buildings and under slab radiant heating systems.
  • Not affected by moisture or humidity. Inhibits condensation and does not promote the growth of fungi, mold or mildew. Does not promote nesting of insects or rodents.
  • Class 1 Class A Fire Rated (Meets all USA and Intl Fire Codes)
  • Made in USA / Ships from USA / Nominal thickness is 1/4 inch / R8

500sqft NASATECH (6 Mil Reinforced Scrim) White/Foil (Waterproof) Vapor Barrier

by US Energy Products

  • Dimensions: 48 x 5 x 5 inches
500sqft NASATECH (6 Mil Reinforced Scrim) White/Foil (Waterproof) Vapor Barrier
  • 4ft x 125ft (500sqft) Solid White Vinyl Side / Foil Side Super Duty Waterproof / Heavy Duty Scrim
  • Corrosive resistant / wont oxidize / waterproof / heavy duty commercial and residential
  • UV Inhibitor added / Eliminates “Black-Globe-Effect” / Allows for easier and quicker installation.
  • Includes all of the same benefits and advantages as a traditional radiant barrier with the solid white coating
  • Made in USA / SHIPS from USA

(36inch x 100ft) NASATECH White/Foil Double Bubble (XTemp) Reflective Insulation

4x1oo by US Energy Products

  • Dimensions: 48 x 5 x 5 inches
(36inch x 100ft) NASATECH White/Foil Double Bubble (XTemp) Reflective Insulation
  • This product consists of two 99.97% Reflective Layers of Metalized Film bonded to two internal layers of heavy gauge polyethylene bubbles (Poly-Air) (nominal thickness 5/16”).
  • Reflective metalized solid (white faced) insulation vapor barrier for Automitive, warehouse ceilings and walls, concrete flooring, and inside concrete slabs
  • Not affected by moisture or humidity. Inhibits condensation and does not promote the growth of fungi, mold or mildew. Does not promote nesting of insects or rodents.
  • Class 1 Class A Fire Rated (Meets all USA and Intl Fire Codes)
  • Made in USA / Ships from USA / Nominal thickness is 1/4 inch / R8

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