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Exterior Foundation Waterproofing Membrane


SKU MM-HDPE-18-30-100

Our exterior foundation waterproofing membrane is UV resistant, waterproof, and non-biodegradable. It is also resistant to insect and rodent damage, and it will not rot/mildew. 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.

Multiple rolls of HDPE can be connected using the double sided HDPE seam tape.

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.

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


  • 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


    Foundation Waterproofing Tips

    If you have a finished basement to protect from water or other issues but you have come to realize your only access is through the walls, so what to do? The bottom line, you need to waterproof your home's foundation from the outside. You will have excellent protection against humidity and water while keeping your foundation safe. Here are some great tips to waterproof your foundation from the outside:

    1 – Dig up the ground around the circumference of the foundation

    You have to dig all the way down to the base of the concrete footing in order to reach the foundation. If you have other structures in that area such as a sidewalk, decking, and landscaping, you must remove them but before doing so, be sure to get an occupancy permit. To keep damage at a minimum, hire a company that provides residential excavation services. Residential excavation services have the equipment and knowledge to dig the trench correctly. If your home is a condominium, the fastest and most logical approach is hiring a company that provides multiplex building excavation service.

    Pouring Foundation

    Foundation Construction

    2 – Seal all the cracks found in the concrete

    To get an accurate view of the foundation make sure it's completely exposed first. You will be able to inspect for any cracks or other faults including honeycombing which is created by water and moisture issues in the basement. If you find problems, you will have to make repairs to your foundation walls to ensure it's waterproofed properly. An excellent choice to consider is injecting epoxy resin or polyurethane to seal the cracks in the concrete and prevent water from running between the exterior and interior of the foundation.

    3 – Fasten the waterproof membrane to the outside of the foundation

    Because concrete used for foundations is relatively porous, water and moisture in the soil will come in contact with the foundation. Therefore, to stop water from entering the foundation, you should attach the waterproofing membrane to the outside of the foundation.

    There are three different kinds of membranes, synthetic rubber (elastomer) membrane, honeycomb membranes and HDPE waterproof membranes. Each provide a different set of strengths and can be appropriate for different types of installations. In a nutshell, for maximum results, you should cover the footing with one of these membranes and the membrane should extend above ground level.

    4 – Backfill the trench surrounding the foundation

    After you have secured the waterproofing membrane just backfill the trench. Before filling the trench, you should take your time and inspect the condition of the foundation drain. You can cover it with clean gravel and a geotextile to ensure the water drains correctly instead of making it to your newly waterproofed foundation.