Crawl Space Ninja® Seam Tape

(33 reviews) Write a Review
Usually ships within 2 business days.

Product Overview

Free Shipping to the Lower 48 States

  • 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


(33 reviews) Write a Review

33 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Roberto on Nov 22nd 2021

    Great tape

  • 5
    Very sticky tape that holds well

    Posted by Jim on Oct 5th 2021

    The tape was delivered quickly and worked well.

  • 5
    Seam Tape

    Posted by Sharon Bartlett on Aug 31st 2021

    Seam tape is very strong but easy to work with. I wish they would have used this when the house was built.

  • 5

    Posted by Ronald Overby on Aug 23rd 2021

    I give it 5 stars

  • 4
    Crawl Space Seam Tape

    Posted by Leonard Tatum on Aug 22nd 2021

    Sticks to everything. I wish there was a dispenser for the product. It make things go faster.

  • 5
    Seam Tape

    Posted by Craig Ryan on Jun 21st 2021

    This tape is outstanding! I used the exact same product when I transported boats. It was used for repair of the heat shrined plastic they cover them with. I use it all over the house, but it really shined in my crawl space.

  • 5
    Crawl Space Seam Tape - Worked Great

    Posted by Anthony L Bowers on May 5th 2021

    Worked great. Have bought and went through several rolls. wide enough for a good seal is white so it blends with the plastic plenty sticky and after 6 months is still adhering is the right amount of thickness can be a bit difficult to unroll, but that is sometimes the nature of very sticky tape

  • 5
    works great, great mill rating

    Posted by Walter Prillaman on Apr 12th 2021

    If I need this item again this will be my go too store.

  • 5
    Seam tape

    Posted by Tom on Mar 29th 2021

    Excellent product. Definitely will stay put!!