Underground Drainage & Ducting

Underground drainage & ducting forms the backbone of any effective water management system, channelling wastewater, surface water, and rainwater safely away from buildings and into mains drainage or soakaways. Whether you're installing a new drainage run for a housing development, extending an existing system, or laying cable ducting for utilities, selecting the right components ensures long-term performance and compliance with building regulations.

Our Underground Drainage Ducting Range

McMahons stocks a comprehensive selection of below-ground drainage solutions designed for durability and ease of installation.

• Twin-wall drainage pipes in 110mm and 160mm diameters, offering exceptional ring stiffness for deep installations while remaining lightweight for easier handling on site.
• Single-wall perforated land drain pipes ideal for agricultural drainage, French drains, and managing waterlogged ground around foundations.
• Cable ducting in various colours for telecommunications, electrical, and water service identification, meeting utility provider specifications.
• Push-fit couplers, bends, junctions, and reducers enabling quick assembly without the need for solvent cement on most connections.
• Inspection chambers and bottle gullies providing essential access points for maintenance and rodding.

For a complete drainage project, explore our full Civil Drainage Systems range, including Access Covers & Gratings for inspection points and pedestrian or vehicular traffic areas.

Choosing the correct pipe diameter and class depends on your application depth, traffic loading above the trench, and local authority requirements. For standard domestic drainage, 110mm pipes typically suffice, while commercial or deeper installations may require 160mm or heavier-duty specifications.

Why Buy Your Drainage Products From McMahons?

With nearly two centuries of experience supplying Irish builders, McMahons understands the demands of drainage work: from tight project timelines to the need for reliable stock availability. Our team can advise on fall calculations, pipe bedding requirements, and compatible fittings to keep your installation running smoothly. For regular drainage projects, set up a McMahons trade account to access trade pricing and streamline your ordering process.