AGI Pipe: Complete Guide to Subsoil Drainage Solutions

April 22 2026, by Harry Sandhu, 4 min reading time

Effective drainage is essential for protecting your property from water damage, soil erosion, and structural issues. Whether you're working on a landscaping project, retaining wall, or construction site, AGI pipes are one of the most reliable solutions for managing underground water.

At A Class Building Materials, we supply a wide range of AGI pipes, designed for residential, commercial, and civil drainage applications.

What is an AGI Pipe?

AGI (Agricultural) pipe is a drainage pipe used to collect and redirect groundwater away from structures.

These pipes are commonly made from durable materials like HDPE or PVC and are designed to:

Allow water to enter through slots or perforations
Prevent soil from entering (when fitted with a sock filter)
Safely redirect water away from foundations

AGI pipes are widely used in subsoil drainage systems to reduce hydrostatic pressure and prevent water buildup.

Types of AGI Pipes Available

1. Slotted AGI Pipe

Designed with perforations to allow water to enter the pipe.

Best for:

Subsoil drainage
Retaining walls
Garden beds

2. Socked & Slotted (With Filtersock) AGI Pipe

Wrapped in a geotextile fabric to prevent clogging from soil and debris.

Benefits:

Reduces silt buildup
Improves long-term performance
Requires less maintenance

Socked AGI pipes are ideal for landscaping and construction projects where soil movement is common.

3. Unslotted AGI Pipe

Solid pipe used to transport water from one point to another.

Best for:

Stormwater transfer
Connecting drainage systems
Controlled water flow

Common Applications of AGI Pipes

AGI pipes are highly versatile and used across multiple industries:

Behind retaining walls
Around building foundations
Landscaping and garden drainage
Driveways and pathways
Agricultural drainage systems
Construction and civil projects

They help control groundwater, reduce pressure on structures, and prevent long-term damage.

AGI Pipe Sizes & Options

At A Class Building Materials, you’ll find a range of sizes to suit your project:

65mm AGI Pipe

Ideal for small to medium drainage projects
Suitable for residential landscaping

100mm AGI Pipe

Higher water flow capacity
Perfect for commercial and heavy-duty drainage

Available in multiple lengths such as 20m, 50m, and 100m, making installation flexible and efficient.

Key Benefits of Using AGI Pipes

✔ Efficient groundwater control
✔ Prevents water damage to structures
✔ Reduces hydrostatic pressure
✔ Durable and corrosion-resistant materials
✔ Lightweight and easy to install
✔ Long-lasting performance in harsh conditions

Installation Tips for Better Drainage

To get the best results from your AGI pipe system:

✔ Install in a gravel-filled trench for better filtration
✔ Use geotextile fabric (sock) to prevent clogging
✔ Ensure proper slope for water flow
✔ Connect to a suitable discharge point
✔ Avoid using AGI pipes for heavy stormwater (use proper stormwater pipes instead)

Why Buy AGI Pipes from A Class Building Materials?

Wide range of AGI pipes (slotted, socked, unslotted)
Suitable for DIY, landscaping, and construction projects
High-quality materials built for Australian conditions
Competitive pricing across Australia

We provide everything you need for effective drainage solutions in one place.

Final Thoughts

AGI pipes are an essential part of any drainage system, helping to manage groundwater and protect your property from costly damage. Whether you're working on a small garden project or a large construction site, choosing the right AGI pipe ensures long-term performance and reliability.

Explore our full range of AGI pipes and build a drainage system that works efficiently for years to come.

FAQs

Q: What is AGI pipe used for?
AGI pipes are used for subsoil drainage to remove excess groundwater and protect structures.

Q: What is the difference between slotted and socked AGI pipe?
Slotted pipes allow water entry, while socked pipes include a filter to prevent soil clogging.

Q: Can AGI pipe be used for stormwater?
AGI pipes are designed for groundwater drainage, not high-volume stormwater systems.