Reinforced Concrete Root Barrier
Listed building, basement extension or commercial slab? Reinforced concrete is the heavy-duty option when nothing else will do.
What it is
Where a poured concrete wall is the only sensible option
A reinforced concrete wall poured into a trench between tree and structure. Used where the consequences of root ingress are severe, for example on listed buildings or near deep foundations.
A reinforced concrete wall, typically 150–250 mm thick, cast against the soil face of the trench and extending below the active root zone.
Best for
- Listed and high-value structures
- Sites where HDPE depth would be impractical
- Permanent infrastructure protection
Not ideal for
- Tight access gardens
- Budget-led domestic installations
Pros & cons
Concrete Barrier pros and cons
- Effectively permanent
- Doubles as a structural retaining element
- Zero risk of joint failure
- Highest cost option
- Most disruptive install
- Requires longer cure and reinstatement window
How it compares
Concrete Barrier vs other root barriers
| Barrier type | Best for | Typical depth | Service life | Cost (£/lm) | Disruption |
|---|---|---|---|---|---|
| HDPE | Mature broadleaf trees within 10 m of a property | 1.0–2.0 m | 50+ years | £90 – £160 | Medium |
| Copper Geotextile | New tree planting near hardstanding | 0.3–0.6 m | 20+ years | £60 – £120 | Low |
| Biobarrier | Large landscape projects | 0.6–1.2 m | 15+ years | £100 – £180 | Medium |
| Concrete Barrier This page | Listed and high-value structures | 1.5–3.0 m | Permanent | £250 – £450 | High |
| Bentonite | Sites with active ground movement | 1.0–2.0 m | 50+ years | £140 – £220 | Medium |
| Deflector Panels | New tree pits in pavements | 0.6–0.9 m | 40+ years | £110 – £180 | Low |
All six barrier systems we install, with the page you're on highlighted.
Typical cost
£250 – £450 per linear metre installed
Costs vary heavily with depth, reinforcement specification and access.
Installation summary
How we install Concrete Barrier
- 1. Excavate a wider trench than for membrane systems.
- 2. Fix reinforcement cage.
- 3. Pour concrete in lifts, vibrating to remove voids.
- 4. Cure, then backfill and reinstate.
Commonly used for
Species this barrier is specified for
Concrete Barrier is most often paired with these species. Each guide covers the recommended depth, thickness and install notes.
Common questions about Concrete Barrier
FAQ
Is this overkill for a typical home?
Usually, yes. We only recommend reinforced concrete where the protected asset and consequence of failure justify it.
When is it actually the right call?
Listed buildings, deep-founded structures, listed walls, infrastructure assets, and sites where HDPE depth would need to exceed what the trench can hold without progressive failure. Structural engineers driving the spec usually identify these cases.
How long does it last?
Effectively permanent. A correctly designed and poured reinforced wall has a service life measured in many decades and outlives the structure it protects in most cases.
Does it act as a retaining wall too?
Often yes. Where the trench is deep and ground levels differ between sides, the same wall can be designed to carry retaining loads, which can offset some of the cost against other works.
How much access do you need?
More than for membrane systems. Mini-mix or pumped concrete is usually possible on tighter sites, but reinforcement cages need handling room and the trench itself is wider.
Will it crack over time?
Properly designed and reinforced, no significant cracking is expected within design life. Where ground movement is anticipated, movement joints are designed in rather than left to develop on their own.
Tree near your home? Don't wait for cracks to widen.
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