A chip seal, called a spray seal in Queensland, is bitumen sprayed over a prepared gravel base and covered with rolled stone. It usually beats gravel on upkeep, with less dust, fewer potholes and no regular grading. Gravel costs less to lay. Sealing pays when that upkeep outweighs the one-off cost of the seal and any base and drainage work.
Updated 25 September 2026.
Tired of grading the drive? Call (07) 5447 6619 or get an on-site quote. Based in Cooroy, working across the Sunshine Coast, Noosa and Gympie, Brisbane north, Moreton Bay, the Fraser Coast, the Burnetts, Bundaberg, Toowoomba and the Western Downs. See our service areas.
This guide is for owners of long gravel drives on acreage and farms, including tracks that carry utes, trucks, floats or machinery. A seal suits a drive with regular traffic on a base that can be formed and drained; a flat, lightly used track often does fine as gravel. Ready to seal? Ask for an on-site quote.
Ask whether your drive’s length and access suit a seal when you call.
A gravel drive needs steady work. Traffic and water wear it into corrugations, ruts and potholes, and running water scours the wheel paths on slopes. Keeping it usable means grading, topping up lost gravel, clearing drains and controlling weeds, and the work comes round faster with more traffic, on slopes and after heavy rain.
| Upkeep task | Gravel: what triggers it | Spray seal: what triggers it |
|---|---|---|
| Grading | Corrugations, ruts and loose gravel | Not routine; a tightly bound surface resists corrugations |
| Topping up | Resheeting to replace lost gravel | Not needed; a reseal renews the surface |
| Potholes | Water sitting where drainage is poor | Patching where cracks let water in |
| Drains | After heavy rain | After heavy rain, with more runoff |
| Weeds | Ongoing attention | Watch cracks and edges |
| Dust | Dry spells; it cannot be removed entirely | Much less once loose stone is swept up |
| Resurfacing | Resheeting as the gravel thins | A reseal when the bitumen turns brittle or cracks |
Source: TMR Technical Note TN118 (2015); Noosa Council unsealed roads and resealing factsheets (2023/4); Austroads AGPT Part 4K (2026).
Noosa Council, which manages 187 km of unsealed gravel roads, grades them on condition, some up to twice a year: filling potholes, removing corrugations and redistributing loose gravel, with resheeting to replace what is lost. Queensland’s Department of Transport and Main Roads (TMR) notes that potholes form most often where drainage or crossfall is poor.
Noosa Council says eliminating dust entirely on unsealed roads is not achievable, even with regular grading and dust suppression. Wet weather brings soft spots and potholes wherever water sits, and weeds need ongoing attention. Our guide to dust control for gravel roads compares the dust options.
At the Bureau of Meteorology’s Nambour station (040988), January to March each average more than 230 mm of rain, and July to September each average less than 60 mm. Heavy summer rain is when slopes scour and potholes open; the dry months are when dust is hardest to keep down.
Four common answers:
Whatever you choose, get the road base right first: a seal does not fix a poor one.
Gravel costs less to lay than a seal, but the upkeep keeps coming. This guide gives no prices; these are the items that add up:
For a drive used daily, a spray seal usually beats gravel on upkeep, dust and wet weather. It sheds water, stands up better on slopes and ends regular grading. Gravel costs less to lay, and on lightly trafficked roads TMR finds the main periodic work is often just reshaping, so it can still suit a long, flat, lightly used track.
‘Chip seal’ and ‘spray seal’ name the same treatment: Austroads notes that ‘chipseal’ is the New Zealand term, and Queensland’s specifications say sprayed seal. Hot bitumen is sprayed on a prepared base, covered straight away with crushed stone and rolled, and the most common seal is one coat: one layer of bitumen, one layer of stone. See our bitumen spray sealing service.
| Factor | Gravel | Spray seal |
|---|---|---|
| Upfront cost | Lower | Higher: bitumen, stone and any base and drainage work first |
| Regular upkeep | Grading, top-ups, potholes, drains, weeds | Little routine work: drains, crack repairs and, in time, a reseal |
| Dust | Dusty in dry weather | Much less once loose stone is swept up |
| Wet weather | Soft spots and potholes where water sits | Sheds water, if crossfall and drains are right |
| Slopes | Running water scours the wheel paths | Resists scour, if water is controlled at the edges |
| Heavy vehicles and tight turns | Ruts in the wheel paths | Can scuff where vehicles turn or brake hard |
| How long it lasts | Needs work for as long as you keep it | Depends on the base, the drainage and the traffic |
| Who does the work | The owner or a hired grader operator | A sealing crew with a sprayer, stone spreader, rollers and a broom |
Source: TMR TN118 (2015) and MRTS11 (2025); Austroads AGPT Part 4K (2026); Noosa Council factsheets (2023/4).
On a long drive, where gravel struggles depends on slope, traffic and drainage. Running water scours steep pitches, and TMR advises avoiding unsealed surfaces on steep grades; it also notes that sealing floodway approaches can reduce wear from braking. A long, flat, lightly used track that drains well can often stay gravel, with the seal saved for the hard sections.
Water running down a gravel slope scours the wheel paths unless crossfall sends it off, which is why road engineers avoid unsealed surfaces on steep grades. Sealed or not, the edges and table drains still have to take that water.
Traffic has a major effect on how a seal performs. If trucks, floats or machinery use the drive:
Road agencies may seal in stages, prioritising short critical sections such as tight crests. On a drive, the steep pitches that scour are the obvious candidates; which other sections to seal first is a question for the on-site assessment.
Ask whether a part-length seal suits your drive. For a road shared by several properties, see sealing a private road.
For dust and washouts, mostly, if the base and drainage are right. Road agencies count dust reduction and fewer wet-weather delays among the gains from sealing. Grass can still grow through small cracks, so watch those and the edges. A seal sheds rain, and that water still has to go somewhere, so drains matter as much as the seal.
TMR lists dust reduction among the benefits of sealing an unsealed road. A seal does not replace tank care, though, so if you drink roof water:
TMR has seen grass grow through small cracks in bitumen that carries little traffic, so watch the edges and cracks, and repair cracks promptly to keep water out of the base.
A seal sends more water to the drains, and ground problems are generally more costly to fix after sealing, so they and the drainage are sorted out first.
A seal costs more up front than gravel, needs a sound, well-drained base before it goes down, and is not a DIY job. A new seal sheds loose stone for a while, can scuff where vehicles turn sharply, and in time needs a reseal. On a weak or wet base it wears out sooner.
On Australian urban roads, asphalt and concrete predominate for their strength, durability and lower maintenance; on rural roads a spray seal is the main surfacing, and Austroads describes it as economical. On a long acreage drive, gravel costs less to lay than a seal, and a spray seal usually costs less than asphalt.
| Surface | What it is | Upfront cost (relative) | Upkeep | Where it is mostly used |
|---|---|---|---|---|
| Gravel | Compacted road base or crushed rock, unsealed | Lower than a seal | High: grading, top-ups, drains | Rural roads with lower traffic |
| Spray seal (one coat) | Sprayed bitumen with one layer of rolled stone | Higher than gravel, usually lower than asphalt | Low: drains, crack repairs, a reseal in time | Rural roads; see our Sunshine Coast sealing page |
| Asphalt | Stone and bitumen mixed in a plant, machine-laid and compacted | Usually higher than a spray seal | Lower | Towns and cities; see bitumen vs asphalt |
| Concrete | A poured slab; durable, with decorative finishes | Not ranked here | Lower | Towns and cities; watch expansive clay, where soil movement can cause early slab failure |
| Pavers | Laid concrete units, from brick-sized pavers to larger flags | Not ranked here | Not rated here | Home driveways and paths |
Source: Austroads AGPT Part 4K (2026); TMR TN118 (2015) and MRTS30 (2024); Noosa Council unsealed roads factsheet (2023/4); CCAA data sheets (2026).
Concrete and pavers are not ranked on cost here; if you are weighing them, compare written quotes. How long each lasts depends partly on what is underneath: Austroads ties sprayed seal life to climate, traffic and base moisture, and CCAA ties early slab failure on expansive clay to soil movement.
TMR sets no traffic level that makes sealing a road worthwhile; it weighs the ongoing cost of keeping gravel against the one-off cost of sealing, including any drainage and base work first. On a drive, the benefits TMR lists (less dust, fewer wet-weather delays, lower upkeep) count for most with daily traffic, slopes that scour or dust near the house.
| Signs a seal may pay | Signs gravel may still suit |
|---|---|
| Daily traffic, visitors and deliveries | Light, occasional traffic |
| Steep pitches that scour in heavy rain | Flat ground that drains well |
| Dust reaching the house, sheds or tank roofs | A drive well away from the house |
| A base that is formed, drained and firm, or can be made so | A base that would need rebuilding first |
On the seal side, the price follows the work: the length and width, the state of the base and any reshaping, drainage and culverts, and whether a prime and one coat is enough. On the gravel side, count a typical year of stone, grading, drain repairs and your time. For the full list, see what affects the cost of a bitumen driveway. Sunshine Coast Council notes a community perception that unsealed roads cost more to maintain because the surface needs regular ongoing maintenance; TMR weighs each road case by case.
Sealing a gravel drive starts with the base, not the bitumen. The base is checked for soft spots and drainage problems, reshaped and compacted where needed, swept clean and usually primed. Then hot bitumen is sprayed, stone is spread straight away and rolled in, and loose stone is swept off once it has bedded in.
The full sequence, and when you can drive on it, is in how a road or driveway is spray sealed.
Can you chip and seal over gravel? Yes, over a formed, compacted and drained gravel base, but not over loose or unformed gravel. See sealing drives and rural access roads on the Sunshine Coast.
Leave it to a crew. Austroads describes sprayed sealing as work in a potentially hazardous environment, with hot and flammable materials, moving equipment and traffic nearby. Keep children, pets and vehicles well clear on sealing day.
Not practically. A spray seal takes a bitumen sprayer, a mechanical stone spreader, rubber-tyred rollers and a road broom, and on TMR work a trained seal designer sets the spray and spread rates. Austroads describes sprayed sealing as potentially hazardous work, with hot and flammable materials and moving equipment. Your part is planning: note the soft spots, drainage problems and access limits, then contact us.
Even local eradication needs monitoring afterwards. Business Queensland sets out weed strategies from planned, ongoing management to local eradication, which it suggests for a small property with a well-defined problem; by law, herbicides can only be used as their label allows. On a seal, watch the edges and any cracks: TMR has seen grass grow through small cracks in bitumen that carries little traffic, so repair cracks promptly. See how we seal driveways and rural roads on the Sunshine Coast.
Of gravel, spray seal and asphalt, gravel costs least to lay, because sealing adds bitumen, stone and any base or drainage work. Among sealed surfaces, Austroads describes sprayed seals as economical, and a spray seal usually costs less than asphalt. Concrete and pavers are not ranked here, and the cheapest to lay is not always the cheapest to keep. See what affects the cost of a bitumen driveway.
Compare the whole life, not just the laying. Gravel needs grading, topping up, drain repairs and weed control for as long as you keep it. Concrete is durable, but on highly expansive clay, soil movement can cause early slab failure unless the design allows for it. Get written quotes for both, and ask us to quote a seal if you are also weighing one.
It can be, for a flat, well-drained drive with light traffic, if you accept regular upkeep. TMR notes that on lightly trafficked unsealed roads the main periodic work is often just reshaping. Expect grading, topping up, potholes after rain and dust in dry weather, more so on slopes and busy drives. See our guide to dust control for gravel roads.
Based in Cooroy, working across the Sunshine Coast, Noosa and Gympie, Brisbane north, Moreton Bay, the Fraser Coast, the Burnetts, Bundaberg, Toowoomba and the Western Downs. See our service areas. Monday to Friday, 6am to 6pm. You can also contact us.
All checked 25 September 2026.
Office: 07 5447 6619
Anthony: 0427 890 222
Joel: 0428 896 333
ABN: 78 650 464 136
ACN: 650 464 136