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Plastic Root Barrier: HDPE Buying & Use Guide
Plastic Root Barrier: HDPE Buying & Use Guide
A plastic root barrier is a solid HDPE sheet that stops roots cold. Here is how to pick the right thickness and depth for your project.
Table of Contents
A plastic root barrier is a solid sheet of high-density polyethylene (HDPE) installed vertically in the soil to stop roots from spreading where they are not wanted. It is the most widely used barrier type because it is durable, long-lasting, and easy to cut and install.
Key takeaways:
- Most plastic root barriers are HDPE, prized for strength and a 100-year in-ground lifespan.
- Thicknesses commonly range from 30 mil up to 80 mil for the most aggressive roots.
- A smooth deflection surface makes roots slide along the wall instead of penetrating it.
- Cuts with a standard utility knife and joins with HDPE sealant tape.
Why Plastic (HDPE)?
HDPE is a recyclable, UV-stabilized plastic that resists soil chemicals and stays intact underground for decades. Unlike fabric barriers, a solid plastic root barrier presents an impenetrable surface: roots cannot grow through it, so they deflect along the wall and downward instead.
Solid HDPE presents an impenetrable surface that roots cannot cross.
How Thick Should a Plastic Root Barrier Be?
Thickness is measured in mils (thousandths of an inch). Lighter 30 to 40 mil material suits smaller ornamental plantings, while 60 to 80 mil is recommended for vigorous bamboo and large tree roots that could damage hardscapes. An 80 mil sheet is thicker than two stacked credit cards, giving a consistent, dependable wall.
Thicker material stands up to the most aggressive tree and bamboo roots.
Roll vs. Panel
Plastic barriers come as continuous rolls or interlocking panels. Rolls let you install a long, seamless stretch with very few joints, which means fewer vulnerable points. Panels offer integrated vertical ribs that are handy in cramped sidewalk cutouts where roots must be directed straight down.
Typical Applications
A plastic root barrier is used to protect sidewalks, driveways, patios, foundations, and property lines, and to contain running bamboo. Because the material is inert it will not leach into the soil or harm the plant.
Barrier Selector Tool
Not sure which barrier height or thickness fits your project? Answer a few questions and get a recommendation, or contact us for volume pricing on large jobs.
Use the Barrier Selector → Request a Quote →Recommended Plastic Root Barriers
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HDPE Plastic Root Barrier RollSolid HDPE in 30 to 80 mil, cut to length with a utility knife. UV-stabilized, 100-year in-ground lifespan, free shipping, made in the USA. Shop HDPE Root Barrier → |
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Permeable Root BarrierA fabric alternative for areas where drainage and air flow through the soil need to be preserved. Shop Permeable Barrier → |
Stop Roots with Solid HDPE
Plastic root barriers from Rhizome Barrier Supply give you an impenetrable wall that lasts for decades. Free shipping. Made in the USA.
Shop Root Barriers →Frequently Asked Questions
What is a plastic root barrier made of?
Most are made from high-density polyethylene (HDPE), a recyclable, UV-stabilized plastic that lasts for decades underground and resists root penetration.
How thick should a plastic root barrier be?
30 to 40 mil works for smaller ornamentals, while 60 to 80 mil is recommended for aggressive bamboo and large tree roots near hardscapes.
Will roots grow through a plastic barrier?
No. A solid HDPE sheet has a smooth surface that roots cannot penetrate, so they deflect along the barrier and grow downward instead.