Every new estate road in Victoria finishes at the same line: a strip of concrete kerb and channel most people never look at twice. Project managers and council officers look at it closely, because the profile, the drawing it was built to and the way it was placed all surface at final inspection. This guide compares the main profiles, sets out the Victorian standards stack and lists the checks worth running before a road design goes in.
What kerb and channel does on a Victorian road
Kerb and channel does three jobs, each obvious the moment it is missing.
- Collects runoff. The channel carries stormwater along the road edge to side entry pits. Without it, water ponds on the pavement or crosses the verge into lots, softening the subgrade until potholes and edge breaks follow.
- Supports the pavement edge. The kerb restrains the asphalt and base course. An unrestrained edge ravels, cracks and drops under wheel loads.
- Separates traffic from people. The kerb face marks where the carriageway ends. Lose that line and vehicles overrun nature strips, crush service pits and put pedestrians at risk.
Kerb profiles compared: barrier, semi mountable, mountable and layback
VicRoads Standard Drawing SD 2001 groups kerbs into three families: barrier (B1 to B3), semi-mountable (SM1 to SM3) and mountable (M1 to M6). The Infrastructure Design Manual (IDM) uses the same B, SM and M families on its SD 100 kerb profiles drawing. The number tells you the shape behind the face: in the IDM set, 1 is kerb only, 2 is kerb and channel, and 3 is kerb and tray. So B2 means barrier kerb and channel, and SM2 means semi-mountable kerb and channel.
Barrier kerb
A barrier kerb has a steep, near-vertical face built to stop vehicles mounting it. It belongs on arterial and higher-order roads, in medians, along commercial or industrial frontages, and where a kerb abuts public open space. The trade-off is access: every driveway needs a layback, adding formwork on streets with many lots.
Semi-mountable kerb
A semi mountable kerb has a sloped face that a car can climb at low speed without damage. SM2 is commonly specified in Victorian residential subdivisions, though the governing manual and council drawing decide it on any given project. It suits local streets where driveway positions may shift late in the design. The downside is a weaker deterrent to verge parking.
Mountable or rollover kerb
A mountable kerb has a low, rounded profile that vehicles roll over freely. It turns up on access lanes, low-speed local streets and some industrial estates where trucks need to cross the kerb line. Because the face is low, less water is held in the channel before flow spills onto the verge, so the drainage design has to allow for it.
Layback at crossings
A layback is not a road profile in its own right. It is the transition where the kerb drops so vehicles can cross into a lot, and the IDM details it on SD 120 for B2 and B3 kerbing. VicRoads notes that transitions between kerb types should develop over at least one metre.
| Profile | Designation | Where it belongs |
| Barrier | B1, B2, B3 | Arterials, medians, commercial and industrial frontages |
| Semi-mountable | SM1, SM2, SM3 | Residential collector and local streets |
| Mountable or rollover | M series (FM in some council sets) | Access lanes, low-speed streets |
| Layback | IDM SD 120 or council drawing | Vehicle and pedestrian crossing points |
The Victorian standards stack
Three layers decide which kerb you build and how.
- The council’s adopted manual. The Infrastructure Design Manual is a joint initiative of Victorian regional and rural councils, and its standard drawings cover kerb profiles (SD 100), laybacks (SD 120) and the matching side entry pits. Not every council uses it. Whittlesea works from the Engineering Design and Construction Manual plus its own drawings, while Hume and Wyndham publish their own sets. The first question on any project is which manual the responsible authority has adopted, and which revision.
- VicRoads standard drawings. Now published by the Department of Transport and Planning, these sit under the VicRoads Supplement to the Austroads Guide to Road Design. SD 2001 shows the barrier, semi-mountable and mountable profiles, SD 2102 covers kerb transitions, and SD 2103 covers channels and spoon drains. SD 2001 calls for N25 normal class concrete complying with AS 1379. Many councils reference these drawings directly, and they apply on arterial roads. The full set is on the VicRoads technical drawings page.
- AS 2876, Concrete kerbs and channels (gutters), manually or machine placed. This Australian Standard covers materials, profiles, subgrade and bedding preparation, tolerances, surface finish, joints and inspection. Standards Australia currently lists the 2000 edition as withdrawn, yet VicRoads drawings and council specifications still cite it. Confirm which edition and clauses your contract specification actually calls up.
Construction notes contractors actually get judged on
These are the points superintendents and council engineers check first.
- Concrete grade by application. N25 is the VicRoads baseline for standard profiles. Councils may call for a higher grade at industrial frontages, roundabouts or heavy vehicle routes, so read the project specification rather than assuming.
- Joints. Shrinkage-control, construction and expansion joints go where the specification places them. Where the kerb sits against a concrete pavement, carry the pavement joints through the kerb, and set joints cleanly at pits and laybacks.
- Line and level. Channel grade is what moves water, so a small level error becomes a ponding complaint after the first storm. Set-out against the design levels, then survey before the pour.
- Machine versus hand placed. Slipform or extrusion machines give a consistent profile on long, straight runs. Hand forming suits tight radii, laybacks, pit transitions and repairs. AS 2876 covers both methods.
- Bedding and subbase. A soft or poorly compacted base shows up later as settlement and cracked sections. Get compaction signed off before concrete arrives.
- Protection until cured. Apply curing compound promptly, keep plant and traffic off, and barricade the run. A hot northerly in a Melbourne summer dries fresh concrete fast, and early damage is rework at the contractor’s cost.
How kerb and channel ties into subdivision drainage
The channel is the first stage of a subdivision’s minor drainage network. Runoff travels along it to side entry pits, which are detailed to suit each profile (the IDM has separate pit drawings for B2 and SM2), then into pipes heading for the outfall or a retarding basin.
In larger storms, the pipes fill and the road reserve carries the overland flow. Kerb height then decides how much water the road holds before it reaches lots. That makes profile choice a drainage decision as much as a traffic one, which is why VK Civil delivers road edges alongside drainage and stormwater works on subdivisions rather than treating them as separate packages. If you are still sorting who builds what on a project, the September civil versus building construction post sets out the split.
Where the kerb meets the lot: laybacks and vehicle access
Every lot needs vehicle access across the kerb line. The cleanest result comes from locating laybacks during design and forming them in the same pour, rather than saw cutting new kerb later. Council approval is normally required for each access point. We cover vehicle access from the property side in an upcoming developer guide, and our road construction and driveways team handles both as one scope.
Tips box: five spec checks before submitting a road design
- Name the governing manual and revision. IDM, EDCM or the council’s own set, with the drawing revision date shown on the plans.
- Label every road with a kerb designation. Write B2 or SM2, not just “barrier” or “semi-mountable”, and match each side entry pit to that profile.
- Show every transition and layback. Mark where profiles change and where vehicle and pedestrian crossings sit, allowing at least one metre for each transition.
- Call up concrete and method clauses. State the grade, the AS 2876 edition and any VicRoads Section 703 reference the authority expects.
- Check channel grades against the drainage design. Look hard at flat spots near intersections and sag points, and confirm overland flow stays within the road reserve.
Many of the costly surprises on a subdivision start well before kerbing, and our guide to subdivision mistakes that cost developers before the first excavator arrives covers the earlier ones.
Frequently asked questions
What is a combined kerb and drainage channel? It is a single concrete section that combines the raised kerb with the channel in front of it, poured together as one unit. In the IDM drawing set it carries the “2” designation, such as B2 or SM2. One element edges the pavement while the other carries stormwater to the pits.
What are the different types of kerbs? The main families are barrier, semi-mountable and mountable (or rollover) kerbs, each available as kerb only, kerb and channel, or kerb and tray. Some older Melbourne streets also retain bluestone kerb and channel, which councils detail separately.
What is the difference between kerb and gutter? The kerb is the raised edge; the gutter is the shallow concrete strip beside it that carries water. Both terms describe the same element. Victorian councils and VicRoads use kerb and channel, while kerb and gutter is common elsewhere and appears in the title of AS 2876 itself.
What does kerb and channel cost per metre? There is no reliable published rate, and VK Civil does not publish one. Cost depends on the profile, the total length, how many laybacks and pits interrupt the run, machine versus hand placement, site access and the council’s specification. Quotes are prepared per project once the design is known.
Planning roads and drainage for a Victorian subdivision? Explore our civil works services or contact the VK Civil team to talk through your design.