Skip to content
⛟ FREE SHIPPING ON EVERY ORDER
Free shipping on every order · (800) 351-9633
Plastic Crawl Space Moisture Barrier HDPE roll 30 inch 40 mil
Crawl space moisture barrier installed at foundation
HDPE thickness comparison
Plastic Crawl Space Moisture Barrier HDPE roll 30 inch 40 mil
Crawl space moisture barrier installed at foundation
HDPE thickness comparison

Plastic Crawl Space Moisture Barrier

$19.99 - $1,256.81
$235.11
$19.99 - $1,256.81
$235.11
Free Shipping

Chose Material Depth and Thickness: 30 Mil Thickness - 12" x 100' Roll
Plastic Crawl Space Moisture Barrier

Our plastic HDPE crawl space moisture barrier protects crawl spaces and foundation walls from ground moisture and water intrusion.

Installed below grade against the structure, the durable plastic sheet limits subterranean moisture movement and keeps surface water from pooling against the foundation. It bends to follow curves and corners, cuts with a standard utility knife, and joins vertically or horizontally with HDPE seam tape and adhesive.

Available in thicknesses from 30 to 100 mil and heights from 10" to 96", with 3"×3" samples in every thickness. Made in the USA, the same material also serves as an effective root barrier for trees, bamboo, and weeds.

Water & Moisture Barrier – HDPE

Water & Moisture Barrier — HDPE

Exterior-grade, heavy-duty waterproof HDPE for limiting subterranean water movement and keeping surface water from pooling against foundations, walls, and crawl spaces. Made in the USA.

🇺🇸 Made in USA 💧 Waterproof HDPE 🚚 Free Shipping
Height10" – 96"
Thickness30 – 100 mil
Roll Lengthup to 100 ft
MaterialHDPE
SamplesAvailable
Water & Moisture Barrier — HDPE

Our exterior-grade heavy duty waterproof HDPE material is an ideal solution for limiting subterranean water movement while preventing surface water from pooling against foundations, walls, and other structures. The HDPE sheet material is typically installed below grade, adjacent to the structure being protected, and acts as a reliable water / moisture barrier for foundations, basements, crawl spaces, and retaining walls.

The barrier can be bent and can conform to curves and corners granted that turns are accomplished with a radius. Because of the thickness of the material a perfect 90 degree turn cannot be made.

At a Glance
📐
Multiple Thicknesses & Heights 30 to 100 mil, in heights from 10" to 96"
✂️
Easy to Cut Standard utility knife or hand saw
🔗
Joins Vertically or Horizontally With sealant tape and adhesive
🏭
Made in the USA Domestically produced HDPE
HDPE water barrier installed along a wall

Installed for Easy Inspection

The barrier in this installation was installed a few inches away from the wall to allow for an occasional visual inspection to ensure that water was not flowing around the barrier and pooling against the structure.

How most of our customers install

Most of our customers dig a trench either right along the structure or right next to the wall. They drop in the plastic barrier leaving a few inches exposed above grade which holds back any pooling water. The trench is then backfilled and the dirt holds the barrier in place. No adhesive is required in this installation.

Attaching to a wall

Some of our customers inquire about needing to permanently adhere the barrier to a wall. For this installation type we recommend using a peel and stick product such as subseal. This product has an adhesive backing and will stick to a primed and cleaned wall. Subseal can be overlapped and “stacked” for very tall walls. For tall installations we generally recommend choosing a single taller roll where possible, since a large horizontal seam is laborious to install and is the most likely spot for water penetration over time.

Holding the HDPE in place on a tall installation

Some of our customers run into a situation where they are using the HDPE to waterproof and require that the plastic is affixed to the wall prior to back filling. The vertical instant lock adhesive bonds to both the HDPE and concrete and can hold the barrier in place until the area is ready to be backfilled.

Seaming the Barrier

If more than a 100' length is required the barrier can be joined. In order to provide the best joint possible we suggest that both the HDPE seam tape and adhesive is used. Use 1 roll of tape and 1 tube of adhesive for 18" and 24" heights and double that amount for taller barriers. To create the best seam possible overlap the HDPE by 4' and in the overlap place multiple vertical strips of the double sided seam tape and then multiple lines of the adhesive. Press the two sides together for approximately 1 minute and a solid seam will be made. Keep in mind that even when done correctly the seam is the weakest link in the water barrier and over time the most prone spot to leak. Whenever possible avoid seaming the material for the best result.

Water Barrier Tape - Moisture Resistant
Seam Tape
HDPE vertical instant lock adhesive
Adhesive

🎬 Thickness Comparison Video

See the various thicknesses of HDPE barrier that we offer

Other Applications

HDPE water barrier can also be used as a root barrier for trees, bamboo and weeds. When used as a root barrier, the HDPE sheet effectively prevents the plant's root from spreading throughout the landscape.

Shipping Transit Times: We Ship Fast!

✅ Free shipping — most orders ship next day

Shipping estimates shown on the map pertain to this specific product only. Orders typically ship next day if the order is placed before 12:00 noon EST. Transit times displayed in the map are listed in business days, and are approximate. The day that the order is shipped is not counted as a transit day.

Shipping transit time map

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare