What Is a Gravel Board and Why Does Your Fence Need One?

If you are fitting a new fence with concrete fence posts, one of the questions we get asked most often is: do I actually need gravel boards? The short answer is yes - and this guide explains exactly why. Gravel boards are a small investment that can add years to the life of your fence panels. Here in Lincolnshire and the East Midlands, where ground conditions can be wet and heavy, they are not really optional if you want a fence that lasts.

What Does a Gravel Board Actually Do?

A gravel board is a horizontal board that sits at the very base of your fence, between the bottom of your fence panels and the ground. Its job is simple but crucial: it creates a barrier that keeps the bottom of your fence panels away from damp soil, standing water, and ground-level rot.

Fence panels - even the treated ones - will eventually rot if they sit directly on or close to the ground. Moisture wicks up through the grain of the wood, and the base of the panel becomes wet, soft, and discoloured. Within a few years, the bottom of the panel can be falling apart even while the top still looks fine.

A gravel board takes all of that punishment instead. When it eventually degrades - and with concrete gravel boards, that might be 20 or 30 years down the line - you simply replace the board rather than the entire fence panel. It is the cheapest part of the fence doing the most important protective job.

Why Concrete Gravel Boards Are the Best Choice

You can buy gravel boards in timber, but if you are using concrete fence posts, it makes sense to use concrete gravel boards as part of the same system. Here is why:

Concrete gravel boards will never rot. Timber gravel boards are designed to sacrifice themselves to protect your panels, but that means you will be replacing them every five to ten years. A concrete gravel board in the ground near Gainsborough or anywhere across the East Midlands will still be in perfect condition long after the fence panels above it have been replaced once or twice.

They are impervious to insects and fungal attack. Timber is vulnerable to woodworm, fungal decay, and other biological damage. Concrete is not. Once it is in, it gets on with the job quietly and permanently.

They are stronger. Concrete gravel boards resist ground pressure and soil movement far better than timber. In the clay-heavy soils common across Lincolnshire and South Yorkshire, this extra stiffness and resistance to movement makes a real difference to the long-term stability of your fence line.

What Size Gravel Board Do You Need?

Gravel boards are typically available in a standard length of 6 feet (to match standard fence panel widths), and in different depths. The most common depth is 150mm (6 inches), which is enough to provide a solid barrier between the ground and the bottom of most fence panels.

When it comes to choosing your concrete fence post sizes, the gravel board is an important factor. An 8ft post with a 6ft fence panel and a 150mm gravel board will give you the correct finished height when the post is properly set. If you are unsure which combination is right for your fence, give us a ring on 07989 192742 and we will walk you through it - it is the sort of question we answer every day.

How Do Gravel Boards Fit to Concrete Fence Posts?

One of the biggest advantages of gravel boards for concrete fence posts is how easily they fit. If you are using slotted concrete posts - which is the standard system we supply here in Gainsborough - the gravel boards simply slide into the slots at the base of the post, just like the fence panels do.

There is no fixings, no drilling, no bolting. You set your first post, drop in the gravel board, slide in your fence panels, set the next post, and repeat. The whole system locks together cleanly and securely without specialist skills or expensive tools. It is a straightforward DIY job that most homeowners tackle themselves.

The key is to make sure the gravel board is level and sitting correctly in the base of the slot before you continue building the fence upward. A spirit level and a bit of care at this stage will make the whole fence look sharp and professional.

Do Gravel Boards Need Concrete Footings?

The gravel boards themselves do not need individual footings - they are held in place by the fence posts on either side. The posts, however, should be set in postcrete or a concrete mix to ensure the whole structure is solid and secure. For most residential fence runs across Nottinghamshire, Lincolnshire, and South Yorkshire, postcrete is fine. For exposed or windy sites, a slightly deeper setting and a stronger concrete mix is a sensible precaution.

Gravel Boards and Concrete Posts: The Complete Fencing System

The combination of slotted concrete fence posts, concrete gravel boards, and standard timber fence panels is by far the most popular residential fencing system in the UK - and for good reason. The concrete elements handle all the hard work: holding the structure upright, resisting ground moisture, and shrugging off rot and pest damage. The timber panels sit safely above the ground, ventilated and protected, and can be replaced cheaply and easily when they eventually need it.

It is a system that has been proven over decades across thousands of gardens and properties in the East Midlands and beyond. If you are building a fence that you want to last 25 years or more without ongoing maintenance, this is the setup to use.

We supply the full system from our yard near Gainsborough - posts, gravel boards, and concrete slabs - and we deliver across North Lincolnshire, South Yorkshire, and North Nottinghamshire. See our current prices or get in touch for a fast quote.