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Concrete Waterproofing Membrane


SKU MM-HDPE-18-30-100

Our concrete waterproofing membrane is waterproof, UV resistant, and non-biodegradable. The plastic is also resistant to insect and rodent damage, will not rot/mildew and is commercial grade. Multiple rolls of HDPE can be connected using the double sided HDPE seam tape.
It is proudly made in the USA from High-density polyethylene (HDPE). It is available in various sizes and thicknesses. The thicknesses range from 30 mil to 100 mil ( a mil is a 1,000th of an inch). Roll heights range from 10” to 60” with the lengths mainly being 100’ with a few rolls being 80’ in length.

Above in picture 2: The barrier was installed a few inches away from the concrete wall to allow for a occasional visual inspection to ensure that water was not flowing around the barrier and pooling against the wall.

This material is stocked in Kansas City and typically ships within one business day.

Material Thickness:
30 mil = 1/32”
40 mil = 3/64”
60 mil = 1/16”
80 mil = 5/64”
100 mil = 3/32”

Note: Our HDPE plastic is only available in roll widths up to 60 inches.

Please note that we are unable to provide custom roll lengths.

We also offer rigid HDPE in 48" x 96" sheets in both black and white colors.

View pricing and product info >

Product Info

  • Model: HPDE
  • Material: High Density Polyethylene (HDPE)
  • Size: Various
  • Free Shipping
  • Need a written quote? Request Online
  • Questions?  Call (800) 604-5537

Product Benefits

  • Waterproof
  • Commercial Grade
  • UV Resistant
  • Non-Biodegradable
  • Will Not Rot or Mildew
  • Resistant to Rodent and Insect Damage
  • 100 Year Material Lifespan
  • Made in the USA

Connecting HDPE Pieces

There are two ways to connect multiple pieces of HDPE together. One method is to overlap the HDPE and use our double sided seam tape to connect the two pieces. The other method is to butt the ends together and use our 17 mil single sided seam tape to create a solid connection.


Overlap Method
(for underground installations)

The overlap method is best used when connecting two pieces of HDPE in a buried application. Due to the overlap, a ridge is exposed which is not ideal when installed in exposed vertical or flat installations in high traffic areas as there is a possibility of an object catching on the ridge and pulling the two pieces apart.

In a below ground installation, the large overlap area provides a more water resistant connection as well as enhanced protection against tree and plant root intrusion.

View Tape Pricing and Seaming Instructions >

End to End Method
(for exposed installations)

When installing HDPE on a wall, floor or anywhere that is exposed, the end to end method provides a secure connection and does not leave any ridges exposed to potential catching by a person or object.

View Tape Pricing and Seaming Instructions >


  • All HDPE rolls ship for free (standard ground, see map)
  • Call: (800) 604-5537 for pricing and shipping questions.

    Shipping estimates shown on the map pertain to this specific product only. HDPE orders typically ship same day if the order is placed before 12:00 noon CST. Transit times displayed in the map are listed in business days, and are approximate. Transit times are subject to stock levels at regional warehouses.  The day that the order is shipped is not counted as a transit day.

    Stratagrid Shipping Map
    HDPE Seam Tape
    HDPE Seam Tape
    HDPE Seam Tape
    HDPE Seam Tape
    HDPE Seam Tape
    HDPE Seam Tape

    HDPE Seam Tape


    About Concrete Waterproofing Membranes

    Like everyone else, you just want your basement to remain dry by keeping moisture off the foundation. Many homeowners have discovered waterproofing membranes to help them out. In the following, we will discuss how this product can withstand pressures surrounding the basement and how the product works.

    Walkway to basement

    Doors to Furnished Basement

    Typical Membranes

    Typically is a thin layer of material that is placed over the concrete preventing water from entering. These layers are made of, plastic, coated fabric materials, and rubber, or petroleum-based asphalt. This product is available in sheets or as a spray-on. Usually, the layer is 2 to 4 millimeters in thickness.

    One of the most important properties of this material is its absorption rate which is approximately 1 to 2% although if the percentage is 4%, it's often considered an acceptable rate of absorption.

    The thickness of the material is important and most manufacturers provide a thickness that is uniform in order to provide an application that is even and seamless.

    Foundation professionals use this material because it will help to withstand hydrostatic pressure and chemical erosion. Keep in mind, the membrane must offer a low-absorption rate, flexibility, and uniform thickness. This is usually because most foundation companies will use the membrane as the only protection for the foundation.

    Spray-On Applications

    This membrane is a spray-on application that will stop water from getting on or into the foundation either exterior positive or interior negative. One very popular choice is an asphalt waterproofing membrane. It comes in a sticky liquid emulsion that holds up on vertical concrete surfaces and can be applied as a spray or with a roller and trowel.

    In many cases, a fiberglass webbing material will be applied between the coatings for more reinforcement. Liquid waterproofing is perfect for interior or negative applications and is known for its easy application, low volatile organic compound content (VOC), and for waterproofing in difficult, hard-to-reach areas. Liquid membrane offers the best coverage and is considered the most appropriate waterproofing product on the market as it will not crack or shrink in hot, dry temperatures. Use spray-on tar coating before the crushed Roundstone for reinforcement or repairing the foundation. Another choice is the waterproofing membrane in sheets but this product has more problems for your home, especially when used by itself for foundation protection.

    About Membrane Sheets

    These sheets also come in films that mechanically fasten or simply placed next to the concrete Sometimes these membranes are self-adhering, and referred to as “peel and stick” membranes, have an integral layer of adhesives. Before application, the contractor will peel a release liner off the adhesive coating and then stick the membrane on the surface before applying the backfill.

    For the record, there are non-adhesive membrane sheets that are PVC and polyurethane rubber sheets that can be removed and repositioned to fit your needs. Contractors can weld the seams and joints of these sheets to reinforce possible weaknesses. For a positive application, the contractor should show caution when preparing the ground. The soil must be compacted and level, sharp stones must be removed, and there should be a layer of sand in place before the backfill can be re-added.

    Once you are sure there are no sharp objects that can puncture the membrane, roll it out on top of the concrete forming the shape of the foundation slab while applying it. That said, there could be other issues down the road to consider.

    Mold on Basement Wall

    Mold Growing on Basement Wall

    Construction of Foundation

    Foundation with Basement

    There's More Than One Part For Good Foundation Waterproofing

    There's no doubt that membrane plays an important part in foundation waterproofing but it's not the only step. There can be several failures that can take place including an unexpected release of bonding from the foundation, failures in curing, inconsistencies in the thickness, and punctures from tree roots or burrowing animals Even an insignificant weakness can allow moisture to enter the concrete creating major problems which over the long-haul will be expensive. Never rely on the membrane alone to protect the foundation. A better choice is crushed Roundstone when combined with a spray-on tar membrane, weeping tiles, a working sump pump, and other measures to keep your basement dry and safe.