Crawl Space Seam Tape

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Product Overview

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  • 9-mil Seam Tape 4" x 180'
  • Polyethylene film
  • Pressure sensitive adhesive
  • White Shiny Finish
  • Qty - 1 Roll

Crawl Space Seam Tape

A polyethylene film, single coated with a synthetic rubber pressure sensitive adhesive. This is not your average crawl space vapor barrier seam tape. This 4” 9-mil thick seam tape comes in 180’ (60 yd) long rolls. The color is bright white and is sure to help brighten your crawl space jobs. Our crawl space seam tape is polyethylene backed and single sided. It is great for any crawl space encapsulation or basement waterproofing project.

Waterproof Seam Tape for Crawl Spaces

Poly tapes are a superior in adhesive and they can be hand torn. This tape also offers noticeably better water and weather resistance than traditional crawl space seam tapes. Poly tapes are perfect products for use in many applications such as crawl space encapsulation, basement waterproofing, splicing, color coding, marking and sealing. This poly tape is commonly used in the Marine, Service, and Construction industries among others. Poly tapes are frequently used in shrink film and zipper door applications. The serrated edge assists with easy tearing.

Q: How Much Crawl Space Seam Tape Do I Need?

Typically, we recommend 1 roll (4"x180') for every 250 square feet of crawl space. Additionally, if you have support pillars, add 1 additional roll for every four pillars.


  • Agricultural
  • Wire identification
  • High durability surface protection
  • Polyethylene splicing
  • General industrial masking, bundling, splicing and repair applications
  • All-purpose waterproof sealing applications

Product Benefits

  • Provides a watertight seal and humidity resistance in a range of weather conditions
  • Low-residue aggressive adhesive allowing the material to be repositioned
  • Bonds well to most surfaces over a wide temperature range
  • Good conformability for application to rough or irregular surfaces

Product Videos


(19 reviews) Write a Review

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  • 5
    Great tape

    Posted by Craig Ryan on Jan 25th 2021

    I used to haul new boats and we used this tape to seal seams in the white covers they put on at the factory. It's incredible tape. Good for a lot of uses around the house.

  • 5
    Seam Tape

    Posted by Chad Janssen on Jan 3rd 2021

    This tape is awesome - great adhesive, easy to use and easy to cut.

  • 5
    High quality tape. Matches the white plastic perfectly.

    Posted by Joe Weimer on Dec 16th 2020

    Highly recommend the DIY Crawlspace Ninja store

  • 5

    Posted by David Thompson on Dec 14th 2020

    Not used much yet, work in progress. Very pleased so far.

  • 5
    Seam tape

    Posted by Nancy Yarbrough on Nov 5th 2020

    Love this tape. It’s so forgiving and adherence is excellent.

  • 5
    Sean Tape is a great product

    Posted by Aundrea Azelton on Oct 27th 2020

    Very happy with this seam tape. Easy to use, great sticking power but possible to reposition.

  • 5
    Crawl Space Seam Tape

    Posted by Tom Ashbaker on Oct 5th 2020

    Tape had great adhesion and wide enough to cover my seams easily, awesome product!

  • 5
    Seam Tape

    Posted by Terry Feldmann on Oct 2nd 2020

    This is the best tape to utilize with the 12 mill vapor barrier.

  • 5
    Tape Works

    Posted by robb on Sep 16th 2020

    This is my first experience with crawl space tape. But, I can say this tape works well. I laid approx 100’ of it today between the strips of 12 mil in my crawl. This tape is slightly tough to cut with a sharp razor knife. If you stab it in the middle, you can cut half way through and then cut the other half. It appears to stick well to 12 mil but I wonder if it will pull up. I was able to pull it and reset it a few times. I did not waste any in the process. If you’re patient, you can lay straight wrinkle free lines. 4” is nice, it allows 2” on each side of a seam. You could not pull and tear this if you wanted, its that tough.