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  • Crawl Space Ninja® Dimple Underlayment
  • Image of Dimple Vapor Barrier Underlayment by Crawl Space Ninja
  • Image of Dimple Vapor Barrier Underlayment by Crawl Space Ninja
  • Image of Dimple Vapor Barrier Underlayment by Crawl Space Ninja Image of Dimple Vapor Barrier Underlayment by Crawl Space Ninja

    Crawl Space Ninja® Dimple Underlayment

    Crawl Space Ninja®

    MSRP:
    Now: $229.99
    (You save )
    (7 reviews) Write a Review

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    Product Description

    Free Shipping to the Lower 48 States

    • Non-Toxic & Safe to Handle
    • Qty – 1 Roll 6'9" x 50'
    • Flow Rate: 18 gal/min/ft

    Vapor barrier drainage matting underlayment has water channels created by molding high density polyethylene (HDPE) into sheets featuring aligned dimples. The stud-shaped dimples create space between the vapor barrier and the ground, allowing water to flow quickly and harmlessly away while protecting the crawl space vapor barrier.

    • 100% recycled HDPE content used for the base material, environmentally safe and non-toxic

    • Linear aligned dimples for a clear open drainage path for bulk water transport

    • Membrane can be installed in any climate – is not weather dependent

    • Compression strength of sheet meets IRC requirements for lateral earth pressures to 16 ft – 7590psf

    Vapor Barrier Underlayment Technical Data:

    • Color: Gray
    • Material: Recycled High Density Polyethylene
    • Dimple Height: .315 (8mm) ASTM D6364-06
    • Compressive Strength: 7590 psf ASTM D6364-06
    • Flow Rate: 18 gal/min/ft ASTM D4716-08
    • Temperature Range: -20°F to 175°F ASTM D5261-92
    • Chemical Properties: Excellent chemical resistance
    • Toxicity: Non-toxic, nonpolluting
    • Weight per unit area:  21.70 oz/yd2² 736 (g/m²) ASTM D5261-92
    • Roll length: 50'
    • Roll width: 6'9"-34lbs
    • Service life expectancy: >30 years (at pH between 4 and 9, and temperature below 77°F / 25°C)

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    Image of Dimple Vapor Barrier Underlayment by Crawl Space Ninja
    Crawl Space Ninja®
    Crawl Space Ninja® Dimple Underlayment

    7 Reviews Hide Reviews Show Reviews

    • 5
      Underlayment

      Posted by William J Cyr on Oct 31st 2022

      Get this stuff installed as soon as you can! It will make working on the crawl space a million times better. No more crawling in dirt and rocks..

    • 5
      Dimple Underlayment

      Posted by Robert Ross Stewart on Jul 20th 2022

      Easy to layout and a joy to have under knees rather than the gravel that was originally there.

    • 5
      Dimple underlay

      Posted by C on Feb 26th 2022

      Great for wet basement floors

    • 2
      Wrinkled seam doesn’t lay flat.

      Posted by Caleb on Jan 31st 2022

      The most troublesome aspect of this new product is the flattened overlay seam doesn’t lay flat when installed. I had to make small cuts along that edge to allow the product to lay somewhat flat. This seems to be a different product or a different manufacturing process since last year.

    • 4
      Dimple Underlayment

      Posted by Leonard Tatum on Aug 22nd 2021

      I need to order a third roll for a 1000 sq crawl space. Good product over all and easy to put down.

    • 5
      excellent

      Posted by kelvin argueta on Dec 27th 2020

      fast shipping great price

    • 5
      Good underlayment

      Posted by Jeffrey J Ammons on Nov 30th 2020

      This was super easy to install and it makes working in the crawl space more comfortable. I only put this in the wettest parts of my crawl space and I am glad I did. I put the underlayment down at the same time I got the dehumidifier and it made crawling around more comfortable as I did other projects prior to putting in the vapor barrier.

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