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


(12 reviews) Write a Review

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  • 5
    It works, it's sticky

    Posted by Dan on Feb 4th 2021

    1) This works super well. Very maleable. It is tear-able, but it works better if you use scissors to cut it. 2) Listen, if you're tring to cover all the holes and odd corners and shapes in your crawl space, then you need MORE than you think. I wish it weren't so expensive, but if it is what you need to finish the job, get at least an extra roll or two. To be fair, I'm totally an amateur and have likely used more than someone would with more expereince. That said, you still probably need more than you think. And it is good to have extra hanging around should you find or create any additional holes you need to cover up.

  • 5
    Does the job

    Posted by Andryar on Feb 2nd 2021

    This tape worked great with the CrawlSpace Ninja 12 mil vapor barrier, and was forgiving enough during installation ... but holds very well when finished! Smoothed it with a plastic scraper.

  • 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!