Open Graded Asphalt (OGA) is a porous asphalt mix designed to improve safety and reduce traffic noise in urban environments. With large voids exceeding 20%, this mix allows surface water to drain quickly, reducing spray and improving visibility during wet weather.
OGA is widely used in Australia and overseas as a wearing course for roads, carparks and council-managed infrastructure. It’s a proven solution for projects where noise attenuation and surface safety are key priorities.
Looking for low noise porous asphalt for roads?
Call 1300 267 255 or click Request a Quote to get started.
Features and Benefits
Noise Reduction
Australian mix designs have shown reductions of up to 3dB(A) compared to dense graded asphalt and up to 5dB(A) compared to spray seals
Wet Weather Safety
Porous structure allows rapid drainage of surface water, reducing spray and improving grip
Urban Friendly
Ideal for low traffic noise surfacing in residential and metropolitan areas
Applications
Open Graded Asphalt is ideal for:
- Council roads and urban streets
- Carparks and pedestrian zones
- State roads and arterial corridors
- Building surrounds and sports infrastructure
Why Choose Open Graded Asphalt?
Open Graded Asphalt is a trusted choice for councils and contractors seeking to improve road safety and community amenity. Its porous design helps reduce hydroplaning risk and traffic noise, making it especially effective in residential zones and high-density areas.
Benefits include:
- Enhanced safety in wet conditions
- Improved acoustic comfort for nearby residents
- Fast installation with bulk hot mix supply
- Proven performance across Australian infrastructure projects
Open Graded Asphalt supports quieter, safer streets — helping meet community expectations for liveability and road performance. Its use in residential zones and near schools or parks can significantly improve amenity and reduce complaints related to traffic noise.
Technical Details
Open Graded Asphalt is supplied as a hot mix in bulk format. It contains:
- Porous graded aggregates
- Bitumen binder
- Void content exceeding 20% for effective drainage
Typical placement thickness is around 30mm, depending on project requirements.
Frequently Asked Questions
What makes Open Graded Asphalt different from other mixes?
Its porous structure allows water to drain through the surface, improving safety and reducing noise.
Is it suitable for council roads?
Yes. OGA is widely used by councils for urban streets, carparks and community infrastructure.
Does it help with noise reduction?
Yes. It can reduce average traffic noise by up to 5dB(A) compared to spray seals.
Can it be used in wet climates?
Absolutely. Its drainage properties make it ideal for areas with frequent rainfall.
Tools & Resources
Looking for low noise porous asphalt for roads?
Call 1300 267 255 or click Request a Quote to get started.