Gravel boards are the sacrificial layer of a fence — a cheap component whose entire job is to take the ground contact instead of your panels. Once they go, the clock starts on much more expensive timber.
What's causing it
Permanent ground contact
Timber boards are doing exactly what they were installed to do; failure is expected eventually.
Soil banked above board height
Once soil covers the board, the moisture line moves up onto the panel.
Blocked drainage along the fence line
Where the ground stays wet, boards fail years earlier than on free-draining plots.
Fix options
Concrete gravel boards
You want to stop repeating this job
Slotted into concrete posts or fitted with cleats against timber posts; effectively permanent.
Treated timber boards
Matching a timber-post fence on a budget
Cheaper and easy to swap again later; expect a finite life in wet ground.
Board replacement plus soil regrade
Ground level is the underlying problem
We cut back the border build-up so the new board isn't buried the day it goes in.
Self-diagnosis: check these first
- 1
Push a screwdriver along the length of the board — soft spots mean it's on the way out.
- 2
Check whether panel bottom rails are now touching soil.
- 3
Look for the board having disappeared entirely under years of leaf mould and border build-up.
Preventing it happening again
- Clear leaves and soil away from the fence base each autumn
- Specify concrete boards on shaded or wet boundaries
- Keep borders and mulch a hand's width clear of the timber
Get this fixed properly
Free site visit across London and Hertfordshire, a written specification and a fixed price before anything starts.
Frequently asked
Can concrete boards go with timber posts?
Yes, using cleats or brackets — a common and effective combination.
Do I need gravel boards at all?
Not strictly, but without them the panel becomes the sacrificial part, which costs far more to replace.
How long does replacement take?
A typical domestic run is a half-day to a day depending on length and access.
Do panels have to come off?
They are lifted clear and refitted, not dismantled, in most cases.