Best Tape for Vapor Barrier – 2023 Updated!

Are you in the midst of a home improvement project and looking to enhance the efficiency and protection of your vapor barrier? Look no further!

Vapor barrier tapes are specially designed adhesive tapes used in construction and home improvement projects to create a strong and secure seal in vapor barrier installations. Choosing the right tape for your vapor barrier is a critical step in preventing moisture infiltration and preserving the integrity of your home.

In this comprehensive guide, I have curated a list to find out the best tape for vapor barrier, carefully updated for the year 2023.

Whether you’re a diligent DIY enthusiast or a homeowner seeking professional guidance, this blog is tailored to meet your needs.

Product Reviews for Vapor Barrier

FeaturesBlue Summit Supplies Vapor Barrier TapeXFasten White Vapor Barrier TapeVapor Barrier Tape, Moisture Barrier Seam, and Seal Tape
Thickness9 milTrue 9 mil9 mil
Adhesive TypeSynthetic rubber-based pressure-sensitive adhesiveSilicone adhesiveSynthetic rubber-based pressure-sensitive adhesive
CompatibilityPE films, moisture barriers, various surfacesVapor barrier films, all surfacesPE films, various surfaces
Suitable ApplicationsCrawl spaces, marine use, abatement, restoration, outdoor masking, construction, flooring, stuccoCrawlspace encapsulation, construction sheathing, house wrap, underlaymentCrawl space encapsulations, moisture barrier sealing, abatement, restoration, marine preservation, patching, outdoor masking, basement, underlayment
Temperature Range-40°F to 200°F-4°F to 203°F-40°F to 200°F
UV ResistanceYesYesYes
Width3.78 inches3.78 inches4 inches
Length180 feet180 feet180 feet
Adhesion StrengthTenacious and strongGoodSticky and long-lasting
Ease of UseEasy to tear off, almost structural strengthChallenging unrolling, adhesive tears off tapeEasy to work with, recommended for crawl space applications
Surface CompatibilityMay not adhere well to old vapor barrier, difficult to remove without damageGood adhesion to ducts and insulation, difficulty adhering to surfaces with moisture or dirtExcellent adhesion to vapor barrier plastic, may not adhere well to painted concrete
RemovabilityGlue is hard to remove after tape removalDifficult to remove once appliedInitial stickiness makes repositioning challenging
DurabilityCan get damaged under UV exposureCan withstand extreme heat, low temperatures, moisture, UV, and humidityHighly durable, sticky, insulating, weatherproof, and waterproof
VersatilitySuitable for various applicationsSuitable for specific applications like taping seams on basement wallsVersatile for various applications

Blue Summit Supplies Vapor Barrier Tape


  • High-performance and durable 9 mil thick polyethylene white vapor barrier seam tape.
  • Moisture-resistant and designed to withstand demanding conditions.
  • Synthetic rubber-based pressure-sensitive adhesive for excellent bonding to a variety of surfaces.
  • Suitable for binding seams of PE films and sealing moisture barriers.
  • Ideal for crawl spaces, marine applications, abatement, restoration, and outdoor masking.
  • Waterproof insulation tape for patching, repairs, and house wrap applications.
  • Can be used for bundling and separation of dissimilar metals.
  • Provides a dust barrier and crawl space liner.
  • 3.78 inches wide and 180 feet long for extensive coverage.
  • Suitable for construction, renovation, flooring, underlayment, and stucco application.
  • Perfect for boat and marine preservation, repairs, and water-resistant needs.
  • It can withstand temperatures from -40°F to 200°F. This means that it can be used in both cold and hot climates.
  • It is also resistant to UV rays, so it will not degrade when exposed to sunlight.


  • Tenacious and strong adhesive.
  • Can be easily torn off.
  • Almost structural strength.
  • Cuts easy.
  • Super sticky.
  • Works well for crawlspace encapsulation.
  • Good for repairing tears and joining seams.


  • The adhesive may not adhere well to the old vapor barrier.
  • Glue is hard to remove after tape removal.
  • May pull off foil over time if stretched too much during application.
  • Can get damaged under UV exposure.
  • Difficult to remove without damaging surfaces.
  • Mistakes are difficult to correct due to strong stickiness.
Blue Summit Supplies Vapor Barrier TapePrice
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XFasten White Vapor Barrier Tape


  • Industrial-grade plastic white vapor barrier tape with waterproof and weatherproof silicone adhesive.
  • True 9-mil thickness for reliable and easy-to-install vapor barrier seam sealing.
  • Extreme adhesion to Polypropylene and Polyethylene films, concrete, unfinished walls, and wood.
  • Compatible with all vapor barrier films and suitable for all-weather and all-surface underlayment.
  • Designed to withstand extreme heat, low temperatures, moisture, UV, and humidity.
  • Operating temperature range of -4°F to 203°F without degradation or flaking.
  • Suitable for crawlspace encapsulation, construction sheathing, house wrap seaming, and underlayment.
  • 3.78 inches wide and 60 yards long for extensive coverage.
  • A mess-free adhesive that does not ooze out, ensuring a professional finish.
  • Versatile and sticks to almost all surfaces, including concrete and Polyethylene films.
  • Laboratory tested and certified to be a true 9-mil thick vapor barrier tape.


  • Good adhesion to ducts and insulation.
  • Durable and sticks well to basement wall insulation.
  • Extra wide for better seam coverage.
  • Wiping the surface with Isopropyl alcohol improves adhesion.
  • Suitable for taping seams on basement walls.
  • Wide enough to overlap the existing tape.
  • Initial adhesion is strong on clean surfaces.


  • Adhesive may come off on the top layer, making it difficult to handle.
  • Unrolling the tape can be challenging.
  • Adhesive tears off the tape, making it hard to lay smoothly.
  • May not adhere well to surfaces with moisture, dirt, or dust.
  • Difficulty in using the tape, especially when stretching or pulling off the roll.
  • May not adhere to stained wood for a prolonged period.
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Vapor Barrier Tape, Moisture Barrier Seam, and Seal Tape


  • Heavy-duty, commercial-grade white vapor barrier tape.
  • It measures 4 inches wide and 180 feet long.
  • 9 mil thick for durability and reliability.
  • Highly durable, sticky, insulating, weatherproof, and waterproof.
  • Moisture-resistant PE (Polyethylene) film backing with an extremely sticky adhesive.
  • Synthetic rubber-based pressure-sensitive adhesive coating for high conformability and bonding to various surfaces.
  • Ideal for crawl space encapsulations, moisture barrier sealing, dust barriers, and more.
  • Suitable for abatement and restoration, marine and boat preservation, shrink wrap, patching and repairs, outdoor masking, basement ceiling, and underlayment applications.
  • It can withstand temperatures from -40°F to 200°F.
  • UV-resistant polyethylene film tape.
  • Excellent adhesive for wall and floor liners of a crawl space.
  • Can be used for masking surfaces during stucco application and painting, surface protection, color-coding, splicing, and seaming on pipefitting covers.
  • Suitable for use under floating floors and carpet padding.
  • Versatile and can be used for various applications.
  • Made from high-quality polyethylene and rubber for reliability.


  • Easy to work with and adheres well to formboard insulation and plastic sheeting.
  • Recommended for crawl space applications and sealing moisture barriers.
  • Sticky adhesive that stays in place, even when wet.
  • Provides a strong and long-lasting bond.
  • Effective for sealing and preventing water infiltration.
  • Works well for temporary and permanent installations.
  • Excellent adhesion to vapor barrier plastic.
  • Good for cutting into smaller pieces for easier application.


  • May not stretch as well as other tapes, making it prone to tearing and creasing.
  • Initial stickiness can make it difficult to remove or reposition once applied.
  • Can be challenging to start pulling off the roll, requiring extra effort.
  • Cutting with scissors may cause the adhesive to gum up the blades.
  • May not adhere well to painted concrete surfaces.
Vapor Barrier Tape, Moisture Barrier Seam, and Seal TapePrice
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How to Choose the Best Tape for Crawl Space Vapor Barrier

A crawl space vapor barrier is vital in maintaining a healthy and energy-efficient home. It helps prevent moisture infiltration, condensation, and the growth of mold and mildew.

However, the effectiveness of a vapor barrier heavily relies on proper sealing and securing, and that’s where choosing the right tape becomes crucial.

In this guide, we’ll explore the key factors to consider when selecting the best tape for your crawl space vapor barrier.

Understanding the Key Factors

Thickness and Durability

When it comes to vapor barrier tape, thickness matters. Opt for a tape with a higher thickness, typically measured in mils.

A tape with a thickness of 9 mil provides superior durability and can withstand the challenges of moisture, humidity, and potential mechanical damage in crawl space environments.

Thicker tape ensures long-lasting performance and resistance to wear and tear.

Adhesive Type and Compatibility

The adhesive used in the tape is essential for ensuring a secure and long-lasting seal. Look for tapes with synthetic rubber-based pressure-sensitive adhesives or waterproof silicone adhesives.

These adhesives offer excellent bonding to a variety of surfaces commonly found in crawl spaces, such as polyethylene films, concrete, unfinished walls, and wood.

Ensure compatibility between the tape adhesive and your chosen vapor barrier material for optimal results.

Temperature and UV Resistance

Crawl spaces often experience extreme temperatures.

Therefore, it’s crucial to select a tape that can withstand the temperature range typically found in crawl spaces, from -40°F to 200°F.

This ensures the tape’s performance remains reliable in both cold and hot climates.

Also, choose a UV-resistant tape if your crawl space vapor barrier is exposed to sunlight. UV rays can degrade tapes that lack this feature, compromising their effectiveness over time.

Selecting the Right Tape

Application-Specific Features

Consider the specific requirements of your crawl space project. If you’re undertaking crawl space encapsulation, look for tapes that offer moisture resistance, dust barrier properties, and compatibility with insulation materials.

Additionally, some tapes may have additional features making them suitable for abatement, restoration, or marine applications if you have specific needs beyond crawl space vapor barriers.

Adhesion Strength and Ease of Use

To ensure a secure seal, opt for a tape with tenacious and strong adhesion to various surfaces commonly found in crawl spaces.

This includes polyethylene films, concrete, and unfinished walls. Additionally, consider the tape’s ease of handling, unrolling, and cutting.

User experiences often provide valuable insights into these aspects, including feedback on unrolling difficulties and overall user-friendliness.

Surface Compatibility and Stretchability

Verify that the tape you choose adheres well to the specific surfaces present in your crawl space, such as polyethylene films, painted concrete, or wood.

This will ensure a reliable and long-lasting bond. Furthermore, consider the tape’s stretchability.

A tape with good stretchability can accommodate movement and expansion in the crawl space, reducing the likelihood of tearing or creasing during installation.

Removability and Damage Prevention

Determine whether your crawl space vapor barrier installation is intended to be temporary or permanent.

Some tapes are designed for permanent applications, while others offer easier removal or repositioning if needed.

If you anticipate the need to remove the tape in the future, select a tape that allows for clean and damage-free removal from surfaces.

Selecting the right tape for your crawl space vapor barrier is essential for ensuring a properly sealed and long-lasting solution.

By considering these factors, you can choose a tape that best suits your crawl space needs, helping create a healthier and more energy-efficient home.

How to Install Tape on a Vapor Barrier –  DIY Guide

Properly installing tape on a vapor barrier and sealing the surrounding area are essential steps in creating a robust moisture barrier system for your construction projects.

In this step-by-step guide, we will walk you through the process of installing tape on a vapor barrier and sealing the adjacent areas, ensuring a secure and reliable seal. Let’s get started!

Step 1: Prepare the Surface

  • Ensure that the surface where the tape will be applied is clean and free from dust, dirt, and moisture.
  • Wipe down the surface using a cleaning cloth and Isopropyl alcohol to remove any contaminants and improve adhesion.

Required Tools

  • Cleaning cloth
  • Isopropyl alcohol

Step 2: Cut the Tape

  • Measure and cut the vapor barrier tape into the desired length, allowing some extra length for overlap and maneuverability.

Required Tools

  • Utility knife or scissors

Step 3: Position the Tape

  • Carefully position the cut piece of tape over the seam or joint on the vapor barrier.
  • Ensure that the tape covers the entire seam or joint and extends beyond it for proper sealing.

Step 4: Apply Pressure

  • Firmly press the tape onto the surface, applying even pressure along its length.
  • Ensure that the tape adheres well to the vapor barrier, creating a tight seal.

Step 5: Smooth Out the Tape

  • Using your hand or a flat object, gently smooth out any wrinkles or bubbles in the tape.
  • This helps to ensure a secure and uniform bond between the tape and the vapor barrier.

Step 6: Seal the Surrounding Area

  • Inspect the areas adjacent to the vapor barrier, such as corners, edges, and penetrations.
  • Apply a bead of sealant along these areas to create an additional layer of protection against moisture intrusion.

Required Tools

  • Sealant (appropriate for the surface)
  • Caulking gun or trowel

Step 7: Smooth and Shape the Sealant

  • Using a caulking tool or putty knife, smooth and shape the applied sealant to ensure a neat and even appearance.
  • This step helps enhance the seal’s effectiveness and provides a finished look.

Required Tools

  • Caulking tool or putty knife

Step 8: Inspect the Sealed Areas

  • Once all the tape and sealant are applied, carefully inspect the sealed areas.
  • Ensure that the tape is securely bonded to the vapor barrier and the sealant creates a continuous barrier with no gaps or loose edges.

Step 9: Test for Effectiveness

  • Perform a test to check the effectiveness of the vapor barrier seal and surrounding area sealant.
  • Apply a small amount of water or moisture near the sealed area and observe if there are any signs of leakage or moisture intrusion.

By following these step-by-step instructions, you can successfully install tape on a vapor barrier and seal the surrounding areas, creating a reliable and effective moisture barrier system in your construction project.

Final Verdict

Choosing the best tape for your vapor barrier is a crucial decision when it comes to creating an effective moisture barrier system.

With the updated information and insights provided in this guide, you can now make an informed decision based on your specific project requirements.

Investing in a high-quality vapor barrier tape will pay off in the long run by providing enhanced protection, durability, and peace of mind.

So, make a well-informed decision, follow best practices during installation, and enjoy the benefits of a superior vapor barrier system that keeps moisture at bay and preserves the integrity of your construction projects.


What tape do you use on vapor barrier?

Seam tape is the recommended tape to use on vapor barriers. It is specifically designed to create a waterproof seal when joining sections of a vapor barrier, such as crawl space plastic.

Seam tape is used to secure the cut joints of the vapor barrier during installation, ensuring a tight and reliable seal.

Additionally, it can be used to patch punctures caused by gravel or sharp objects and repair any cuts in the crawl space plastic.

Does vapor barrier stop water?

While vapor barriers are effective at preventing moisture and vapor transmission, they are not designed to stop water in cases of flooding or standing water.

In fact, in situations where water accumulates on top of a vapor barrier, it can create an issue. The purpose of a vapor barrier is to inhibit the movement of moisture from the ground into the crawl space or other enclosed areas.

It helps control the levels of humidity and prevent condensation, which can lead to mold, rot, and other moisture-related problems.

However, if water enters the crawl space due to flooding or excessive groundwater, the vapor barrier alone will not prevent its presence.

In fact, the barrier could trap the water, preventing it from draining and exacerbating the moisture problem.

In such cases, it is essential to address the source of the water intrusion and implement appropriate drainage and waterproofing measures to manage the excess water effectively.

How thick should vapor barrier be?

The thickness of a vapor barrier is typically measured in mils, where 1 mil is equal to 0.001 inches of thickness.

For residential applications, building codes commonly specify a minimum vapor barrier thickness of 6 mils (0.006 inches).

This thickness is suitable for many general purposes, but for crawl space applications, it is advisable to opt for a thicker vapor barrier to ensure enhanced durability and protection against moisture.

In crawl spaces susceptible to moisture issues, I recommend using a vapor barrier with a 9 mils or higher thickness.

A thicker vapor barrier offers increased resistance to punctures, tears, and degradation over time, providing better long-term performance in crawl space environments.