Paving vs Asphalt vs Concrete: Picking a Surface

Paving, asphalt and concrete are three different answers to the same question, and the right one depends on the loads, the slope, the drainage and how you feel about maintenance. What they all have in common is that the layers underneath decide whether any of them last.

Paving vs Asphalt vs Concrete: Picking a Surface — practical guidance from the team running roads and paving on the Garden Route. Below is an honest comparison of the three, where each genuinely wins on the Garden Route, and the preparation that matters more than the choice between them.

The three surfaces, in plain terms

Block paving — interlocking concrete blocks or clay pavers laid on a bedding sand over a compacted base, with sand-filled joints and a restraining edge. It is a flexible surface: it moves slightly under load and the interlock between blocks distributes that movement. Individually replaceable, which is its great advantage.

Asphalt — a bitumen-bound mixture of graded aggregate, laid hot and compacted, over a prepared base. Also flexible, and effectively seamless. What people locally call a “tar driveway” is usually either asphalt or a surface seal, which are not the same thing: a seal is a sprayed binder with stone chips rolled in, much thinner and cheaper, and a genuinely different product with a different life.

Concrete — a rigid slab, jointed, reinforced or not depending on the design. It does not flex; it spans. Which means it can bridge a soft spot that would rut under the other two, and it means it cracks if the ground beneath it moves more than it can tolerate.

Those three behaviours — flexible and jointed, flexible and continuous, rigid — explain almost every practical difference between them.

	Block paving	Asphalt	Concrete
Behaviour	Flexible, jointed	Flexible, continuous	Rigid, spans
Up-front cost	Moderate to high	Moderate	Highest
Repair	Lift and relay individual blocks	Patch, visible	Difficult; usually a full bay
Services under it	Lift, dig, relay — near invisible	Saw, dig, patch — visible forever	Break out and recast a bay
Steep slopes	Can creep; needs restraint	Softens and can shove in heat	Best of the three
Heat and UV	Unaffected	Softens; binder ages	Unaffected
Maintenance	Joint sand, weeds, occasional relay	Reseal on cycle	Joint sealant; little else
Permeability option	Yes — permeable systems	Rarely	Rarely

Supply shapes this choice more than people expect. Asphalt has to arrive hot from a plant, so Much Asphalt and the regional plants effectively set a haul radius beyond which a small asphalt job stops making sense — which on parts of the Garden Route rules it out for a domestic driveway. Concrete block paving does not have that constraint: Technicrete, Bosun and SmartStone supply through the merchants and the blocks keep indefinitely. Concrete is batched locally to a specified class. For a small job a long way from a plant, that logistics difference frequently decides it before the technical comparison does.

Where each one genuinely wins

Block paving wins where services run underneath, because you lift the blocks, dig, backfill and relay, and the repair is almost invisible. It wins on appearance for domestic driveways and entrances. It wins where you want a permeable surface — permeable paving systems let water through into a storage layer below, which can reduce your attenuation requirement and is increasingly attractive as municipalities tighten stormwater conditions. And it wins on phasing, because you can pave in sections.

Asphalt wins on cost per square metre over large areas, on ride quality, and on speed of construction — a yard can be surfaced and in use quickly. It suits parking areas, longer driveways and access roads. It is also quiet under tyres, which matters on an estate.

Concrete wins where loads are heavy, where vehicles turn and manoeuvre on the spot, where fuel or oil spillage is likely, and on steep slopes. Turning heavy wheels shear a flexible surface; concrete does not care. It also wins over the long term on maintenance — a well-built concrete slab with proper joints needs very little for a very long time.

On a steep Garden Route driveway, concrete is usually the right answer. Asphalt can soften and shove on a steep slope in summer heat, and block paving on a steep slope needs careful edge restraint or it creeps downhill over time. A brushed or exposed-aggregate concrete surface also gives grip when wet, which on a slope in a place that rains all year is not a minor consideration.

What is underneath decides everything

Here is the part that determines whether your surface lasts, and it is the part most quotes skip over in a line.

All three surfaces sit on a stack: prepared subgrade, sometimes a selected layer, and a compacted subbase — typically G5 on domestic work. The surface distributes load into that stack; the stack spreads it into the ground.

A weak or badly compacted base will fail every one of the three. Block paving will rut and dip. Asphalt will crack and depress in the wheel paths. Concrete will crack, and because it is rigid, it will crack decisively rather than gradually. Spending more on the surface over a poor base is spending money in the wrong place.

Compaction in layers, at the right moisture content, is what makes the base work. Material dumped and levelled in one deep lift is dense on top and loose underneath, and it consolidates under traffic in the first year.

Edge restraint is non-negotiable on block paving and matters on asphalt too. Without a properly bedded edge, the surface spreads sideways under load and the joints open up. Most failed block driveways failed at the edges first.

Drainage is the other half. Water in the base destroys it, whichever surface is on top. Falls that shed water to somewhere real, and where relevant a subsoil drain, are part of the job rather than an extra.

The honest test of a quote: if it gives you a rate per square metre for the surface and says nothing about excavation depth, base material, compaction or drainage, it has priced the visible part only.

Life cost, not just the quote

Comparing the three on their up-front rate is the mistake, because they age completely differently.

Asphalt is the cheapest of the three to lay over a decent area and the one with a real maintenance obligation. The bitumen binder oxidises under UV, the surface ravels, and it needs resealing on a cycle to stay watertight. Reseal it and it lasts a long time; skip the reseal and water gets into the base and you are rebuilding, not resurfacing. On the coast, with high UV and year-round rain, that cycle is shorter than the brochure suggests.

Block paving has a low-grade, ongoing maintenance load — joint sand washing out, weeds, the occasional settled area to lift and relay — and essentially no cliff edge. It degrades gracefully and it is repairable indefinitely. Blocks also do not fade the way an asphalt surface greys.

Concrete costs the most to build and the least to keep. Joints need their sealant renewed periodically and that is largely it. Its risk is not gradual wear but a crack, and a crack in a rigid slab is harder to repair invisibly than either of the others.

The service question is the sleeper. If there is any chance of digging up the surface within its life — a new connection, a repair to a pipe, an added circuit — block paving saves you money and appearance every single time. An asphalt patch is visible forever; a broken-out and recast concrete bay is visible and expensive.

Garden Route conditions, specifically

Four local factors change the calculus from a generic comparison.

Year-round rain. Water management matters more here than in a summer-rainfall region, and it pushes toward surfaces and details that shed reliably. It also shortens asphalt reseal cycles, because water finding its way into an oxidised surface is what does the damage.

Salt and UV near the coast. UV ages bitumen binders. Salt is hard on any exposed reinforcement in a concrete slab, which makes cover and mix density matter on driveways just as they do on structures.

Expansive clays inland of George. Seasonal ground movement is hard on a rigid slab. On genuinely expansive ground, a flexible surface — paving or asphalt — that can accommodate movement often outperforms concrete, or the concrete needs designing for it rather than laying to a standard detail.

Slopes. The foothills give you gradients where concrete’s rigidity and grip win, and where asphalt’s summer softening and block paving’s tendency to creep both count against them.

And stormwater conditions. Municipalities are tightening runoff requirements, and permeable block paving is a legitimate way to reduce the hard-surface runoff your site generates. On a site where attenuation is a condition of approval, that can be worth more than the difference in surfacing cost.

Frequently asked questions

Which is better, paving or tar?

Neither in general. Asphalt is usually cheaper per square metre over a large area, quicker to lay and smoother to drive on, but it needs resealing on a cycle and any excavation leaves a visible patch forever. Block paving costs more up front, degrades gracefully rather than failing, and can be lifted and relaid almost invisibly when services need attention. If anything is likely to be dug up in the surface’s life, paving wins. Over a big open parking area with no services under it, asphalt usually does.

What is the cheapest driveway surface?

A surface seal is the cheapest to lay, followed by asphalt, then block paving, with concrete generally the most expensive up front. But the up-front rate is a poor guide, because the maintenance obligations differ enormously — asphalt carries a real reseal cycle, concrete carries almost none. And whichever you choose, the excavation, base and drainage underneath are a large share of the cost and cannot be economised without shortening the life of everything above them.

Is concrete better than paving for a driveway?

For heavy loads, for vehicles that turn on the spot, where fuel or oil spillage is likely, and on steep slopes — yes, concrete is generally the better choice. For a normal domestic driveway on reasonable ground it is more expensive than it needs to be, and it loses the ability to lift and relay for services. Concrete’s weakness is that it is rigid: if the ground moves more than the slab tolerates, it cracks decisively rather than settling gradually.

How thick should the base under a driveway be?

It depends on the subgrade strength and the traffic, which is why a design beats a rule of thumb. What is fixed is the method: topsoil stripped, subgrade prepared and compacted, base material placed and compacted in defined lifts at the right moisture content rather than dumped in one deep layer. Most failed driveways failed in the base and the edge restraint, not in the surface material.

Why is my block paving sinking?

Almost always the base or the edges. Base material placed too thick and compacted only at the top consolidates under traffic. Missing or failed edge restraint lets the paving spread sideways so the joints open, the interlock is lost and the blocks start to rock. Water getting into the base and washing out fines does the same thing more slowly. The good news is that block paving is the one surface where this is genuinely repairable — lift, correct the base, relay.

How often does an asphalt driveway need resealing?

Sooner on the coast than the general guidance suggests, because UV ages the binder and year-round rain punishes any surface that has started to ravel. The practical trigger is condition rather than calendar: once the surface is greying, the aggregate is starting to show and fine cracking is appearing, it is time. Resealing on cycle is cheap; letting water into the base and rebuilding the driveway is not.

What is permeable paving and is it worth it?

Block paving laid with wider joints filled with graded stone, over an open-graded storage layer, so rainwater passes through the surface and is held and released slowly rather than running off. It can meaningfully reduce the runoff your site generates, which matters where stormwater attenuation is a condition of approval — the saving on attenuation storage can outweigh the extra surfacing cost. It needs the right sub-base and periodic maintenance to keep the joints from clogging.

Deciding on a driveway or yard surface?

Tell us the loads, the slope and whether anything runs underneath it. We will tell you which of the three actually suits it, and price the base and drainage properly rather than quoting you a rate for the top 40 mm.

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