Drainage Pipe

Drainage pipe channels surface runoff and groundwater away from structures, yards, and paved areas. This category covers four types of drainage pipe products: dual wall pipe, single wall pipe, sock pipe, and EZ Flow gravel-free subsurface drainage. Solid pipe carries water from one point to another, while perforated pipe collects water from the surrounding soil.

The category is built for contractors, plumbers, and site crews who need drainage pipe supplies for residential yard drains, foundation perimeters, and commercial stormwater lines. Most pipe in this range is corrugated high-density polyethylene (HDPE), which resists corrosion and is not affected by typical soil chemistry. Pair the pipe with Drainage Fittings to connect runs, change direction, and transition between sizes, and with Drainage Catch Basins to collect surface water at low points. Ordering pipe, fittings, and basins together keeps a yard drain job on one materials list.

Drainage Pipe Products

Each group below is defined by its wall construction and how water enters the pipe.

Dual Wall Pipe

Dual wall pipe pairs a corrugated HDPE exterior with a smooth interior wall. The corrugations carry soil and traffic loads, and the smooth interior moves more water than a single wall pipe of the same diameter. It comes in solid and perforated versions with bell and spigot joints and is designed for storm sewers, culverts, and runs under driveways or parking areas.

Single Wall Pipe

Single wall pipe is corrugated inside and out, which keeps it light and flexible. Smaller diameters ship in coils that bend around landscaping and footings without extra fittings. Solid single wall pipe carries downspout and gutter runoff to an outlet, and perforated single wall pipe collects groundwater in yard drains and French drains.

Sock Pipe

Sock pipe is perforated corrugated pipe wrapped in a knitted polyester filter sock. The sock lets water through while it keeps sand and silt out of the perforations, reducing sediment buildup. It is built for French drains and footing drains in sandy or silty soils. In heavy clay, installers often line the trench with Geotextile fabric instead, because fine clay particles can blind a sock.

EZ Flow Subsurface Drainage

EZ Flow is a gravel-free system that surrounds perforated pipe with lightweight polystyrene aggregate held in netting. The aggregate creates the void space that gravel normally provides, so crews carry bundles by hand and skip hauling stone. It is designed for French drains, downspout lines, and foundation drains where equipment access is limited.

How Drainage Pipe Works and Where to Use It

Every drainage system pipe run does one of two jobs: it collects water, or it conveys water to a discharge point. Most drainage pipe systems combine both.

Stormwater Conveyance

Solid pipe moves roof, gutter, and paved-area runoff by gravity to a street, swale, dry well, or storm sewer. Because the solid wall keeps water inside, solid stormwater drainage pipe is the correct choice for roof water headed to the curb. Add access points for flushing with Drains & Cleanouts.

Subsurface and Foundation Drainage

Perforated underground drainage pipe sits in a trench below the water problem. Groundwater enters the perforations and flows along the slope to an outlet. Along foundations, the pipe runs at or below footing level to keep water off the wall. In clay-soil yards with standing water, perforated pipe in a fabric-lined gravel trench, or a gravel-free system, lowers the water table.

Site and Landscape Drainage

Landscape contractors use single wall and sock pipe behind retaining walls, under lawns, and around patios, where flexible coils follow the layout of residential drainage piping systems.

Key Specifications and Planning Steps

Diameter and Flow

Size pipe to the water volume, not the inlet. Larger roof areas, combined downspouts, and paved surfaces need more capacity than a single gutter line.

Slope and Grade

Set a continuous fall to the outlet with no low spots. A minimum of 1/8 inch per foot, about 1 percent, is a common starting point for drainage pipe. Follow local code and project specifications.

Burial Depth and Load

Burial depth for subsurface drainage pipe depends on frost depth, surface loads, soil type, and outlet elevation. Manufacturers publish minimum cover depths for traffic loads, and those tables assume compacted, specified backfill.

Standards and Sediment Control

Corrugated drainage pipe is commonly made to ASTM F667, AASHTO M252, or AASHTO M294 depending on diameter, and dual wall pipe to ASTM F2648. To keep perforated pipe clear, use a filter sock or geotextile fabric, washed stone, and cleanouts for periodic flushing.

Choosing the Right Drainage Pipe

Start with the job, then match the drainage pipe.

     Water source: Roof and gutter water traveling to an outlet calls for solid pipe. Groundwater calls for perforated pipe.

      Soil: Sand and silt pair with sock pipe. Clay pairs with a fabric-lined trench.

      Load: Under driveways, parking, or vehicle traffic, use dual wall pipe at the manufacturer's cover depth with compacted backfill.

      Size: 4-inch pipe is a common size for a single downspout line. Size up for combined downspouts or larger roofs.

      Project type: Single wall suits short residential runs with light loads. Dual wall fits long commercial runs, heavier loads, and specifications that call for gasketed joints or AASHTO-rated pipe.

Keep one construction type of drainage piping per run where possible, and confirm that fittings match the pipe diameter.

Frequently Asked Questions

Where can contractors buy dual wall, single wall, and sock drainage pipe in one order?

Choose a supplier whose drainage pipe category groups dual wall, single wall, sock, and gravel-free pipe together, so all four types go on one materials list. Add matching fittings and catch basins to the same order to cover connections and inlets.

What drainage pipe supplies do I need to order for a residential yard drain job?

A typical job needs perforated or sock pipe for collection, solid pipe to carry water to the outlet, fittings for turns and transitions, and a catch basin or emitter at low points and the discharge end. Add geotextile fabric and washed stone if the trench uses gravel. Those drainage pipe supplies cover most residential yard drains.

What is the difference between dual wall and single wall corrugated drainage pipe?

Dual wall pipe has a smooth interior and a corrugated exterior, carries heavier loads, and moves more water at the same diameter. Single wall corrugated drainage pipe is corrugated on both sides, lighter, and more flexible, and smaller sizes ship in coils for residential runs with light loads.

Should I use sock pipe or wrap perforated pipe in fabric for a French drain?

Sock pipe works well in sandy or silty soils because the knitted sock filters fine particles at the pipe wall. In clay, a geotextile-lined trench with washed stone is often the better choice, since fine clay can clog a sock.

How does a gravel-free drainage system compare with a traditional pipe-and-gravel drainage trench?

A gravel-free system surrounds perforated pipe with polystyrene aggregate in netting, so crews carry bundles by hand and haul no stone. A gravel trench uses standard pipe, washed stone, and fabric, and suits jobs with machine access. Both collect groundwater; the choice depends on access, labor, and project specifications.

What type of underground drainage pipe should I use for standing water in a clay-soil yard?

Use perforated underground drainage pipe in a trench lined with geotextile fabric and backfilled with washed stone, or a gravel-free system. Set the line below the wet zone with a continuous slope to an outlet.

What drainage pipe should I use to keep water away from a house foundation?

Use perforated pipe at or below footing level, with sock pipe in sandy soils, sloped to daylight, a sump, or a permitted storm connection. Carry the collected water away from the structure with solid pipe.

How can I prevent sediment from clogging perforated drainage pipe?

Use a filter sock or geotextile fabric, backfill with washed stone instead of native fines, and install cleanouts so the line can be flushed. Steady slope also helps water carry fine particles through to the outlet.

What slope does a stormwater drainage pipe need to drain properly?

A minimum of 1/8 inch per foot, about 1 percent, is a common starting point for stormwater drainage pipe. Steeper slopes help the line clear debris. Confirm the requirement with local code and project specifications.

What type of drainage pipe should I use where vehicles will drive over the buried pipe?

Use dual wall corrugated HDPE pipe installed at the manufacturer's minimum cover depth for traffic loads, with compacted, specified backfill. Single wall pipe is generally not intended for vehicle loads.

How do I choose the right drainage pipe size for a downspout and gutter runoff line?

Size by the roof area served, local rainfall intensity, and slope. 4-inch pipe is a common size for a single downspout; combined downspouts or larger roofs may need 6-inch or larger. Match the pipe to the downspout adapter.

Do I need solid or perforated drainage pipe to carry roof water to the street?

Use solid pipe. Perforated pipe releases water into the soil along the route, which can return it toward the foundation.

What factors should I consider when determining the burial depth for subsurface drainage pipe?

For subsurface drainage pipe, consider frost depth, surface loads and the manufacturer's minimum cover, soil type, the depth of the water problem, and the outlet elevation needed to hold slope. Check local code before trenching.

What ASTM standard applies to corrugated polyethylene drainage pipe?

ASTM F667 covers corrugated polyethylene pipe and fittings in 3 to 24 inch sizes, and ASTM F2648 covers dual wall profile pipe for drainage. AASHTO M252 (3 to 10 inch) and AASHTO M294 (12 to 60 inch) apply on many road and site projects. Follow the standard named in the project specification.

When should I use single wall drainage pipe instead of dual wall pipe for an underground commercial drainage project?

Single wall fits short, light-load runs such as landscape beds or perimeter collection away from traffic. Dual wall is the standard for long runs, pipe under traffic, gasketed joints, or specifications that require AASHTO M294-rated drainage piping.