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Deeproot water barrier 40 mil HDPE roll
Water barrier installation application
Deeproot water barrier 40 mil HDPE roll
Water barrier installation application

Water Barrier 24 Inch by 300 foot Roll 40 mil Thickness Deeproot Brand

SKU WABR-24-40-300
$917.07 - $917.07
$917.07
$917.07 - $917.07
$917.07
Free Shipping

DeepRoot · Water Barrier · Model WABR-24-40-300

A 24″ × 300′ roll of 40 mil water barrier — an impermeable HDPE geomembrane installed vertically in a trench to stop subterranean water movement beneath hardscapes and landscapes. Around a foundation it prevents tree and plant root intrusion and maintains water equilibrium in the soil. Cuts to length with a utility knife, joins with sealant tape, and is made in the USA.

Roll Size
24″ × 300′The most common depth
Thickness
40 milHeavier sheet for rough backfill
Material
HDPEImpermeable geomembrane
Hydrostatic
294 psiASTM D751, 30 mil sheet
  • Impermeable — stops water, not just roots
  • Cuts with a utility knife
  • Joins with sealant tape
  • Made in the USA
  • Free shipping on all orders
Joining rolls: sealant tape is required to seal vertical or horizontal laps — an unsealed joint is a hole in an otherwise impermeable wall. Call (800) 524-4161 to add tape to your order.

01 DeepRoot · HDPE geomembrane

An Impermeable Water Barrier For Subterranean Water Movement

A water barrier is an impermeable HDPE geomembrane installed vertically in a trench to protect hardscapes and landscapes from subterranean water movement. Unlike a geotextile, which is designed to let water through while holding soil back, a geomembrane is designed to let nothing through at all — it is a wall, not a filter.

That distinction is the whole point. Around a building foundation, the barrier both prevents tree and plant root intrusion and maintains water equilibrium in the soil, so the ground on the structure side does not go through the wet-dry cycling that moves a foundation. On a golf course it separates constructed greens from invasive grasses and surrounding clay soils. In each case the job is to decide where water goes rather than to slow it down.

294psi hydrostatic resistance — 30 mil

Tested to ASTM D751 Procedure A. The 30 mil sheet also carries 80 lb puncture strength to ASTM D4833.

02 Why it works

Impermeable, And Tough Enough To Stay That Way

A water barrier only works if it stays intact, which is why the mechanical numbers matter as much as the impermeability. High density polyethylene gives break strengths of 3,735 psi machine direction and 3,877 psi transverse, with break elongation over 600% — so the sheet yields and stretches under backfill loading rather than splitting. Puncture and tear resistance are what carry it through installation, which is when most geomembranes get damaged.

03 Choose a roll

Depths, Lengths And Thicknesses

Three depths, two roll lengths and two thicknesses. Depth is set by how deep the water and roots you are stopping actually travel; thickness by how much abuse the sheet will take during install and service.

RollThicknessModel
18″ × 100′30 milWABR-18-30-100View 18″ × 100′ 30 mil
18″ × 300′30 milWABR-18-30-300View 18″ × 300′ 30 mil
24″ × 100′30 milWABR-24-30-100View 24″ × 100′ 30 mil
24″ × 300′30 milWABR-24-30-300View 24″ × 300′ 30 mil
24″ × 100′40 milWABR-24-40-100View 24″ × 100′ 40 mil
24″ × 300′40 milWABR-24-40-300View 24″ × 300′ 40 mil
30″ × 100′30 milWABR-30-30-100View 30″ × 100′ 30 mil
30″ × 300′30 milWABR-30-30-300View 30″ × 300′ 30 mil
Heavier sheet available on request. The geomembrane is produced in 30, 40, 60 and 80 mil. The 30 and 40 mil rolls are listed here — call (800) 524-4161 for 60 or 80 mil, or for depths beyond 30″.

04 Geomembrane properties, 30 mil

Tested Properties

ParameterASTM methodMean value
MD break strengthD6383,735 psi
TD break strengthD6383,877 psi
MD break elongationD638611%
TD break elongationD638737%
Puncture strengthD483380 lb
MD tear strengthD100431 lb
TD tear strengthD100433 lb
Hydrostatic resistanceD751, Procedure A294 psi
Values shown are for the 30 mil sheet. Properties for the 40, 60 and 80 mil material are available on request.

05 Product data

Specifications

BrandDeepRoot
MaterialHigh density polyethylene (HDPE) geomembrane
PermeabilityImpermeable
Depths listed18″, 24″, 30″
Roll lengths100′ and 300′
Thicknesses listed30 mil and 40 mil
Also produced in60 mil and 80 mil, on request
CuttingCut to any length with a utility knife
JoiningVertically or horizontally with sealant tape
OriginMade in the USA
ShippingFree on every order

06 Where it goes

Water Barrier Applications

Anywhere subterranean water needs redirecting, or two soil environments need separating.

Building foundations Basement & crawl space walls Retaining walls Golf course greens Sports field construction Planter & bed containment Sidewalks & driveways Patios & hardscape Irrigation separation Soil type separation Utility trenches Landscape water control

07 What it does

Two Jobs At Once

  • Stops subterranean water movement beneath hardscapes and landscapes.
  • Prevents tree and plant root intrusion — roots follow water, and an impermeable sheet removes the reason to grow toward the structure.
  • Maintains water equilibrium around foundations, so soil on the structure side is not driven through wet-dry cycling.
  • Separates soil environments — constructed greens from invasive grasses and native clay, or one planting zone from another.
Water or roots? If the problem is purely roots and you want water to keep moving through the soil, a root barrier is the better tool. A geomembrane blocks both, which is occasionally more than a site wants.

08 Installation

Five Steps To A Sealed Run

  1. Mark the line and check utilities. Set the run between the water source and what you are protecting, and confirm clearances before breaking ground.
  2. Trench to the barrier depth. Keep the trench wall plumb. The barrier only works to the depth it reaches, so match the depth to how deep water and roots actually travel on your site.
  3. Cut to length. The sheet cuts to any length with a utility knife — no heat, no specialist tooling.
  4. Seal every joint. Sheets join vertically or horizontally with sealant tape. This is the step that decides whether the run performs: an unsealed lap is a hole in an otherwise impermeable wall.
  5. Backfill in lifts. Keep the sheet vertical and tight against the trench wall as you go, and inspect the finished run for punctures and open laps before closing it up.

Sealant tape is required to join rolls — call (800) 524-4161 to add it to your order.

09 The full HDPE range

View Our Full Selection Of HDPE Barriers

Water barrier, bamboo barrier and tree root barrier are the same family of HDPE sheet in a trench, produced in a range of depths and thicknesses from 40 mil up to 80 mil. Since it is one material serving three purposes, the full range is catalogued under bamboo barrier — the rolls you will find there are the same product listed on this page. The same sheet is specified as a water barrier, a rhizome barrier or a root barrier depending on what the job is holding back.

If you need a depth or a gauge that is not listed on this page, that is where to look next.

View All HDPE Barriers

10 Free shipping, every order

Shipping And Volume Orders

Free shipping on every order at Landscape Discount — every roll ships free, with no minimum order.

Running a long perimeter? Orders over $5,000 qualify for volume pricing. Call (800) 524-4161 or submit a product quote request and we will put together written volume pricing for your project.

11 Common questions

Water Barrier FAQs

What is the difference between a water barrier and a root barrier?
A water barrier is an impermeable geomembrane: nothing passes through it, water included. A root barrier is designed to redirect roots while letting water and air move through the soil, or in the case of panels and HDPE sheet, to deflect roots without necessarily sealing the ground. If your problem is water movement, or water and roots together, use the water barrier.
Which thickness should I use?
30 mil covers most landscape and hardscape work. Step up to 40 mil where the sheet will see rougher backfill, more aggressive roots or a longer service expectation. The material is also produced in 60 and 80 mil, available on request for demanding installations.
How deep should the barrier be?
Deep enough that water and roots cannot simply travel beneath it, which depends on your soil, drainage and the species nearby. Depths of 18″, 24″ and 30″ are listed here; call for anything deeper. If you are protecting a structure, take the depth from the design rather than estimating.
How do I join two rolls?
With sealant tape, vertically or horizontally. The sheet itself is impermeable, so the joints are the only place a run can leak — tape every lap on both faces and inspect before backfilling. Call (800) 524-4161 to add sealant tape to your order.
Can I cut it on site?
Yes — it cuts to any length with a utility knife. No heat welding or specialist tooling is needed for either cutting or joining.
Will it protect my foundation?
That is one of its primary uses. Installed around a foundation it prevents root intrusion and maintains water equilibrium in the surrounding soil, which reduces the wet-dry cycling that moves foundations. For a structural concern, have the detail specified by your engineer rather than working from a general recommendation.
Is it suitable for golf course construction?
Yes. The impermeable geomembrane is commonly used to separate constructed greens from invasive grasses and surrounding clay soils, keeping the engineered rootzone isolated from the native profile.
How much does shipping cost?
Shipping is free on every order at Landscape Discount — every roll ships free with no minimum order.