Foundations That Stay Dry During Storms

Downspout Extensions in Manteno for homes where roof runoff collects near basement walls

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Blue shield with a house-shaped water drop inside; orange roofline; white window; star at the bottom.

Downspouts that discharge water within a few feet of the house send hundreds of gallons of roof runoff directly toward the foundation during every storm, saturating the soil around basement walls and creating conditions for moisture intrusion, foundation settlement, and persistent wet areas. Extensions move that discharge point farther from the home, directing water toward safer drainage areas instead of allowing it to pool near vulnerable structures. Allied Water Services installs downspout extensions across Manteno and throughout Northeastern and East-Central Illinois, addressing situations where short or poorly positioned downspouts contribute to basement moisture, foundation exposure, or landscape erosion.



Extensions can be installed above ground as rigid or flexible piping that carries water across the yard, or they can connect to underground drainage systems that move water invisibly to a catch basin, dry well, or discharge point. The approach depends on property layout, aesthetic preferences, and whether other drainage components are already in place. Underground systems provide a cleaner appearance but require excavation and piping installation, while surface extensions are simpler to install but remain visible.


Schedule a property inspection to identify downspout discharge issues and determine the most effective extension approach for your home..

What Changes After Downspout Runoff Is Redirected

Installation involves either running piping across the surface from the downspout outlet to a safer discharge location or excavating a trench, installing underground piping with proper slope, and connecting it to the downspout and a terminal outlet. The discharge point must direct water away from the house and prevent it from simply flowing back toward the foundation due to grading.


After extensions are in place, soil near the foundation stays drier because roof runoff no longer saturates that area during storms, mulch and landscaping remain in place instead of washing away with each heavy rain, and basement walls see reduced moisture exposure. Puddles that previously formed near entry doors and garage areas disappear, and ice buildup during winter is minimized because water is not pooling and freezing near the house. You will notice that water exits the downspout and travels to the designated area without creating rivers across your lawn or eroding soil around plantings.



Extensions can integrate with catch basins and dry wells when underground systems are used, creating a comprehensive approach that manages roof runoff from collection through final dispersal. This combination is particularly useful on properties where multiple drainage issues exist or where surface discharge options are limited by grading or neighboring property lines.

Questions Before Starting Your Project

Homeowners dealing with foundation moisture or landscape erosion near downspouts often ask how extensions work and what results they can expect after installation.

  • How far from the house should downspout water be discharged?

    Water should be carried at least six to ten feet away from the foundation to prevent it from saturating the soil around basement walls, though greater distances are better on properties with poor grading or heavy clay soils that drain slowly.

  • What keeps underground downspout extensions from clogging with leaves and debris?

    Downspout filters or gutter guards reduce the amount of debris entering the system, and underground piping can be accessed and flushed if blockages occur. Periodic inspection ensures the system continues to flow freely.

  • Why not just let downspout water drain onto the lawn near the house?

    Concentrated roof runoff overwhelms the soil's absorption capacity, particularly during heavy Illinois rainstorms, leading to standing water, erosion, and moisture migration toward the foundation. Extensions spread that water over a larger area or direct it to a controlled discharge point.

  • What happens if the extension discharges into an area that also has drainage problems?

    The discharge location must be chosen carefully to avoid creating new issues, which is why extensions often connect to catch basins, dry wells, or drainage swales that can handle the volume without causing surface pooling.

  • How does extending downspouts help prevent basement moisture in Manteno?

    By moving roof runoff away from foundation walls, extensions reduce the amount of water saturating the soil around basements, which decreases hydrostatic pressure and limits moisture intrusion through cracks, joints, or porous foundation materials.

Allied Water Services designs downspout extension systems based on your property's grading, gutter layout, and drainage patterns, ensuring roof runoff is directed to a location that protects foundations and landscaping. Contact our team to discuss how extensions can address water problems around your home and integrate with other drainage improvements.