Quick verdict
A roll of 60 mil recycled high-density polyethylene that goes into a trench between tree or bamboo roots and the sidewalk, driveway, foundation or bed they would otherwise invade. Sixty mil is the thickness landscapers specify for running bamboo and street trees, thick enough that roots deflect downward rather than punch through. Installation is the real work: a deep trench and 2 inches of barrier left above grade.
Strengths
- Sixty mil thickness is the landscape standard for bamboo and tree roots
- HDPE is inert, flexible and lasts for decades underground
- Protects sidewalks, driveways, foundations and neighbouring beds
- Roll format follows curves without joints
- Recycled material
Weaknesses
- Trenching to the right depth is heavy work
- Must stand 2 inches above grade or roots climb over
- Overlapped seams need clamps or sealing tape for bamboo
The overall YardToolLab Score is out of 100. Section scores are out of 10.
Roots Go Where They Want Unless You Stop Them
Tree roots lift sidewalks and crack driveways; running bamboo escapes into the neighbour’s lawn. A root barrier is a vertical sheet of thick plastic buried between the plant and the thing you want to protect, which turns roots downward. Convivium’s roll is 60 mil recycled HDPE, the thickness landscape specifications call for, sold by the roll so it follows curves without joints.
This review is based on the listing specifications and on how HDPE root barriers are installed and perform generally. We have not installed this product ourselves.
Why 60 Mil
Thin pond liner and landscape fabric are no match for a bamboo rhizome, which can punch through anything under about 40 mil. Sixty mil HDPE is the standard because rhizomes and tree roots deflect from it rather than penetrate, and the material does not rot, crack or degrade underground for decades. It is stiff enough to stand in a trench and flexible enough to curve.
Installation
Dig a trench along the line you want to defend, 24 to 30 inches deep for bamboo and 18 to 24 inches for most tree root deflection. Stand the barrier in it with 2 inches showing above the finished grade, overlap any joins by at least a foot and clamp or tape them, then backfill and compact. The exposed lip is essential: roots travel in the top inches and will climb over a barrier buried flush.
Trees
Place the barrier outside the tree’s critical root zone so trenching does not sever major roots, and well before paving is laid where possible. The barrier sends new roots down below the paving rather than under it. For an existing tree already lifting a path, consult an arborist before cutting roots.
Bamboo
Running bamboo is the barrier’s hardest test. Surround the planting completely, seal every seam and inspect the lip each autumn, cutting any rhizome that tries to cross. Done properly, a barrier makes running bamboo a well-behaved screen.
Who Should Buy It
- Anyone planting running bamboo near boundaries or paving.
- Homeowners laying new paths or driveways near trees.
- Gardeners protecting foundations, beds or septic lines from spreading roots.
Common Owner Complaints
The labour of trenching and seams that leak rhizomes. A trenching spade or rented trencher helps the first; generous overlap and clamps fix the second.
Alternatives to Consider
Pre-cut 80 mil panels suit straight runs and heavy bamboo. Chemical root inhibitor barriers suit utility corridors. Clumping bamboo needs no barrier at all.
Verdict
Sixty mil HDPE in a roll is the right material for containing bamboo and protecting hardscape from tree roots, and this one is sold at a sensible price. Dig deep, leave the lip showing, seal the seams and it will do its job quietly for decades.
Full specifications
Convivium 60 Mil Recycled HDPE Tree and Bamboo Root Barrier Roll FAQs
For running bamboo, 24 to 30 inches with 2 inches above grade. For tree roots near paving, 18 to 24 inches is common. Deeper is safer in loose soil.
Bamboo rhizomes and surface roots travel in the top inches. A lip above grade stops them hopping over; you can see and cut any that try.
Overlap by a foot or more and clamp with stainless strips or seal with HDPE tape. For bamboo, any gap is an escape route.
A barrier placed outside the critical root zone deflects roots downward and does no harm. Cutting major roots during trenching can; keep the trench well away from the trunk.
