In Queensland, a ‘bitumen’ driveway or road usually means a spray seal: hot bitumen sprayed onto a compacted gravel base and covered with stone chips. ‘Asphalt’ means hot mix: stone, sand and bitumen mixed at a plant, laid with a paver and rolled. Bitumen is the binder in both. What differs is how the surface is built.
Updated 25 September 2026.
Comparing a ‘bitumen’ quote with an ‘asphalt’ one? Get an on-site quote for a spray-sealed driveway or call (07) 5447 6619. 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.
Bitumen is the black binder refined from crude oil. Heated, cut back or emulsified, it becomes liquid enough to spray or mix, then stiffens again as it cools or cures. Tar is a different product, made from coal, and it is no longer used to seal roads in Australia. Many people still call a sealed road ‘tar’.
Tars were once widely used to prime and first-seal roads, because town gasworks made them cheaply and they soaked in and stuck well. Austroads records that their poor durability and sensitivity to temperature made them largely unsuitable as sealing binders, and that making gas from coal gradually stopped once natural gas and LPG arrived. Tars are no longer used for sprayed sealing work. So if someone calls a newly sprayed driveway ‘tar’, the binder is bitumen.
Hot bitumen on site. Hot bitumen can cause burns, so it and its fumes need care: keep clear of the sprayer, and follow the crew’s instructions and the binder’s safety data sheet. For what happens on the day, see how a road or driveway is spray sealed.
Bitumen is an ingredient; asphalt is a finished material. A spray seal puts a thin film of bitumen onto a compacted gravel base and locks stone chips into it, in one or two layers. Asphalt arrives from a plant mixed and hot, then is laid by a paver and rolled. That changes the finish, the upkeep and where each suits.
| Spray seal (what most people call ‘bitumen’) | Hot-mix asphalt | |
|---|---|---|
| What it is | Hot bitumen sprayed onto the base, with stone chips spread into it and rolled; one or two coats | A plant-made mix of stone, sand and bitumen, laid hot as a solid layer |
| How it goes down | Sprayer truck, aggregate spreader, multi-tyred rollers | Mixing plant, delivery trucks, a self-propelled paver, rollers |
| Finish | Textured stone surface; some loose stone early on; more tyre noise, especially with larger stone | Smooth, dense and quieter |
| What it adds to the pavement | Waterproofing and a wearing surface; little or no strength of its own | A bound layer that can add strength |
| Base it needs | Sound, compacted and well drained, with any failures fixed first | The same |
| Tight turning and braking | Stone can scuff off where vehicles turn tightly | Handles turning forces better |
| Heat and heavy loads | Binder can soften and bleed if the grade or spray rate is wrong | Can be tender until it cools after laying; can deform where heavy vehicles move very slowly |
| Upkeep | Resealed over the top as it ages | Crack filling and patching, then resurfacing |
| Usually suits | Long rural drives and roads, and the straight runs of a yard on a strong base | Drives with tight turns, urban streets, roundabouts and intersections |
| Main cost drivers (no figures) | Area, base repairs, one coat or two, stone size | Area, layer thickness, base repairs, distance from the plant, access for trucks and the paver |
Sources: Austroads Guide to Pavement Technology Part 4K (2026); TMR MRTS11 (2025), MRTS30 (2024), Technical Note 175 (2025) and the Transport Noise Management Code appendices (2013); Brisbane City Council specifications S310 and S320; Gympie Regional Council Planning Scheme. Comparisons are relative, with no life, thickness or price figures. Checked 25 September 2026.
Cuzkell is a spray sealing contractor. This article compares the two surfaces so you know what a quote describes.
Many Australians call any black sealed surface ‘bitumen’, and some still say ‘tar’. The trade says ‘asphalt’ or ‘hot mix’ for a plant-mixed layer, and ‘spray seal’ for sprayed bitumen covered with stone. ‘Chip seal’ is a common name in American guides, and Gympie’s planning scheme uses it too. Two ‘bitumen’ quotes can describe different surfaces.
| Word on the quote | What it usually means |
|---|---|
| Bitumen | The black binder refined from crude oil. On a Queensland driveway or road quote, it usually means a spray seal |
| Spray seal or sprayed seal | Hot bitumen sprayed onto the base, with stone spread into it and rolled |
| Chip seal | A common name for a sprayed seal in American guides; Gympie’s planning scheme uses it too, as in “two coat chip sealed” |
| Single-coat and two-coat seal | One application of bitumen and stone, or two. A single application is the most common form; councils such as Gympie call for two coats on rural roads |
| Prime and primerseal | First treatments on a new gravel base that bond it to the seal or asphalt above; a preliminary step, not the finished surface. See primerseal and tack coat on estate roads |
| Hot mix, asphaltic concrete, dense graded asphalt | Asphalt: stone, sand and bitumen mixed hot at a plant |
| Tarmac | Also tarmacadam. A mainly British word for a road material of tar mixed with small stones; Cambridge lists Tarmac as a brand name |
| Blacktop | A word for a bituminous road surface, found in American dictionaries such as Merriam-Webster |
| ‘Asphalt’ in American guides | Can mean the binder itself: Minnesota’s transport department calls the sprayed binder “heated asphalt liquid” |
Sources: Austroads AGPT Part 4K; TMR MRTS11; Brisbane City Council S310; AfPA; Gympie Regional Council Planning Scheme; Fraser Coast Planning Scheme; Cambridge and Merriam-Webster dictionaries; Minnesota Department of Transportation. Checked 25 September 2026.
For what else a driveway quote should show, see what affects the cost of a bitumen driveway.
For the same area, a spray seal usually costs less to lay than hot-mix asphalt. Austroads calls sprayed seals an economical surfacing, and asphalt needs a mixing plant, delivery trucks and a paver. The gap depends on the area, base repairs, access, one coat or two and distance from a plant. Compare the whole life, not the first bill.
What goes into the price of each (no figures):
A per-square-metre figure found online may or may not include base repairs, a second coat or the next treatment, so it is a poor guide to one site. This guide gives no prices; a site visit is the way to price a job. Austroads compares surfaces on whole-of-life cost: the cost to build plus the maintenance each surface will need over the long term. Ask each contractor what the next treatment will be.
Gravel is usually cheaper to lay than either sealed surface, but it needs regular grading. When a road agency seals a gravel road, it is usually to cut that ongoing maintenance, give all-weather access and reduce dust. See gravel or spray seal. For yards, car parks and roads, see what drives the cost of spray sealing a yard or road.
On a long acreage drive, a spray seal usually costs less to lay and cuts dust and mud along its length; it is the main surfacing on sealed rural roads. Where cars turn on the spot, asphalt or a tougher seal copes better. On steep drives, grade and drainage decide. Either surface needs a sound, well-drained base.
On a sound, well-drained base, a spray seal is a recognised driveway surface: Gympie’s planning scheme lists a two-coat bitumen seal among the surfaces for rural residential access handles. See sealing drives and rural access roads on the Sunshine Coast.
Length multiplies the cost of any surface, so a spray seal’s lower laying cost counts for more on a long drive. Whether it is the better value over time depends on the base, the drainage, how many heavy vehicles use it and how often it is resealed, so compare whole-of-life costs. To talk through a long drive, ask for an on-site quote. If dust is the main reason to seal, see dust control for gravel roads and driveways.
On a short drive where cars turn on the spot, asphalt, or a tougher seal treatment in the turning area, is often the better fit.
On a new build, the base comes first: it must be sound, compacted and complete before either surface goes on. For what that check involves, see checking and preparing the base before sealing.
For a yard, depot or farm road, the traffic decides. Turning and braking are what scuff stone off a seal, so a spray seal on a strong, well-drained base suits the straight runs, where it covers a large area economically. Where heavy vehicles turn tightly or brake hard, those zones often get a tougher seal, asphalt or concrete.
For yards, depots and reseals, see bitumen spray sealing.
Sprayed seals are the most common surfacing on the roads Queensland’s Department of Transport and Main Roads manages; they waterproof the pavement economically. Councils such as Gympie call for asphalt in residential areas and at roundabouts and cul-de-sac heads, and a two-coat seal on rural roads. Where a new estate road gets asphalt, it is primed or primersealed first.
Austroads puts sprayed seals at around 70% of the length of all surfaced roads in Australia and New Zealand. Fraser Coast’s development standard defines a bitumen seal as a prime coat and two seal coats, and asks for pavements to be primed and tack coated immediately before asphalt is laid. For how estate roads are staged, see primerseal, tack coat and asphalt on new estate roads. Councils make the same trade-off a property owner faces: a seal on the long rural runs, and asphalt where traffic turns and brakes.
Start with the base, the traffic and the length. Long and rural points to a spray seal. Tight turns, urban streets and intersections point to asphalt. A soft or wet base needs fixing before either. Then ask each contractor what their ‘bitumen’ quote means: spray seal or hot mix, one coat or two, base work included or not.
| Situation | Usually suits | Why | Read next |
|---|---|---|---|
| Long gravel drive on acreage | Spray seal | Seals the whole length and usually costs less to lay; renewed by a reseal | Sealing on the Sunshine Coast |
| Short suburban drive with a tight turn | Asphalt or concrete, or a tougher seal at the turn | Turning tyres scuff a conventional seal | Our Sunshine Coast sealing page |
| Steep drive | Depends on the grade and drainage | Water and turning both matter, so check on site | Checking and preparing the base |
| Truck yard with straight runs | Spray seal on a strong base | Economical over a large area | Spray seal cost factors |
| Truck turning bay or loading dock | Asphalt or concrete, or a high-stress seal | High turning and braking forces | Bitumen spray sealing |
| Farm or private road with trucks | Spray seal on a strong base, with turning zones treated | Sprayed seals are the main surfacing on rural roads; turning zones need more | Sealing a private or shared road |
| New estate road | Urban: prime or primerseal, then asphalt. Rural, and rural residential in some councils: a two-coat seal | What council standards ask for | Primerseal and tack coat on estate roads |
| Existing seal worn, base sound | Reseal | A reseal goes over the existing seal or asphalt | Bitumen spray sealing |
No. Bitumen is the binder; asphalt is stone, sand and bitumen mixed hot at a plant. Many people use the two words interchangeably. In Queensland, a ‘bitumen’ driveway usually means a spray seal, so ask which one a quote means. See how we seal driveways on the Sunshine Coast.
‘Tarmac’, also called tarmacadam, is a mainly British word for a road material of tar mixed with small stones; Cambridge lists Tarmac as a brand name. Tars are no longer used for sprayed sealing in Australia. If a quote says ‘tarmac’, ask whether it means hot-mix asphalt or a spray seal; see what a driveway quote should show.
The Australian Flexible Pavement Association (AfPA) said in March 2026 that Australia imports the majority of its bitumen, mainly from refineries in South Korea, Singapore and Thailand. Bitumen for Australian roads is specified to the Australian standard AS 2008. See how a road or driveway is spray sealed.
The four forms usually listed are class bitumen to AS 2008, polymer-modified binders (bitumen blended with a polymer or crumb rubber), cutbacks (thinned with a cutter oil such as kerosene) and bitumen emulsions. Cutbacks help stone stick in cool conditions; see when to spray seal in Queensland.
Concrete and hot-mix asphalt usually go longer than a spray seal before major work. Cement Concrete & Aggregates Australia, the concrete industry body, describes concrete as durable, with a long service life and minimal maintenance. A spray seal is renewed by resealing over the top. See gravel or spray seal for a long drive.
All checked 25 September 2026.
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 or contact us. Monday to Friday, 6am to 6pm.
Office: 07 5447 6619
Anthony: 0427 890 222
Joel: 0428 896 333
ABN: 78 650 464 136
ACN: 650 464 136