Civil & Drainage

Civil drainage systems form the backbone of effective water management on construction sites, housing developments, and commercial projects throughout Ireland. From managing surface water runoff to directing foul water safely away from buildings, properly specified drainage components ensure compliance with building regulations whilst protecting foundations and preventing costly water damage.

Our Civil Drainage Product Range

McMahons stocks a comprehensive selection of drainage solutions for projects of every scale.

• Underground pipes and fittings: twin-wall and solid-wall options in various diameters, manufactured to Irish Water and local authority standards for both surface and foul water applications.
• Inspection chambers and access points: complete chamber systems with risers, lids, and frames to suit traffic loading requirements from pedestrian to heavy vehicle.
• Gullies and channel drainage: road gullies, yard gullies, and linear channel systems designed for efficient surface water collection in driveways, car parks, and paved areas.
• Land drainage solutions: perforated pipes and filter wraps for agricultural drainage, sports pitches, and waterlogged ground remediation.
• Ducting and cable protection: twinwall ducting for utilities installation alongside your drainage works.

For a complete view of our construction essentials, browse our full Building Materials collection, or explore our Cement & Aggregates range for bedding and backfill materials.

Selecting the correct pipe diameter, gradient, and material depends on your calculated flow rates, ground conditions, and whether you're handling surface or foul water. Our team can advise on specifications to meet Part H requirements and ensure your installation passes inspection first time.

Why Choose McMahons for Your Drainage Project?

With nearly two centuries serving Irish builders, McMahons understands that drainage work demands reliable products delivered when you need them. Our branch staff include experienced specialists who can help you calculate quantities, match components across manufacturers, and ensure you have everything from pipes to sealant in one order. Ready to get your project flowing? Check our delivery options for site delivery across Ireland.

Frequently Asked Questions

1. What type of pipe is best for underground drainage?

PVC-U underground drainage pipes are lightweight, durable, and designed to handle soil pressure and high flow rates, making them ideal for most installations.

2. Do I need a soakaway system for my property?

A soakaway helps manage surface water by allowing it to disperse slowly into the ground. It is recommended in areas prone to flooding or poor natural drainage.

3. Are your drainage products compliant with Ireland building regulations?

Yes. Most items in this category are manufactured to meet relevant BS and EN standards for performance and safety.

4. What is the purpose of geotextile fabric?

Geotextile membranes separate, filter, and stabilise ground layers. They are commonly used in soakaways, driveways, retaining walls, and landscaping.

5. Can I install drainage products myself?

Smaller systems such as garden drainage or mini soakaways can be DIY-friendly. However, larger or regulated drainage networks should be installed by a professional.

6. Do you offer heavy-duty manhole covers for commercial use?

Yes. We stock standard, medium-duty, and heavy-duty manhole covers suitable for pedestrian areas, driveways, and high-traffic commercial zones.