For situations that don't require a full underground drain line, extensions -- either above-ground flexible/rigid pipe or shallow-buried sections -- can direct downspout water several feet further from the foundation than a standard short downspout allows.

  • Above-ground or shallow-buried extension options
  • Directs water further from the foundation than a standard downspout
  • Lower-cost option compared to a full underground drain line

Current Downspout Drainage Trends

  • The distance rule for foundation protection has gotten more specific

    Extensions should redirect water at least 4-6 feet from the foundation, and some 2026 local regulations mandate a minimum 5-foot distance in areas with expansive clay soil specifically, to prevent water from re-entering the permeable backfill zone around a foundation. (Industry downspout/foundation drainage guides, 2026)

  • Larger gutter systems are becoming the new residential standard

    Six-inch gutter systems are becoming standard because they hold nearly 40% more water than 5-inch systems — relevant to downspout sizing and drainage capacity planning together, not just the gutters themselves. (Industry gutter trend coverage, 2026)

Downspout Extension Installation FAQs

How far should downspouts drain from a house in Shreveport?

At least 5 feet from the foundation, and farther where the yard allows. That figure comes from the International Residential Code, which in areas with expansive soils requires roof water to discharge at least 5 feet from foundation walls or into an approved drainage system. Shreveport's clay soils swell when wet and shrink when dry, so dumping roof water next to the slab is one of the main drivers of foundation movement here. The discharge point also needs to slope away from the house — a long extension that ends in a low spot that drains back toward the foundation doesn't solve the problem.

This content is reviewed by the Shreveport Downspout Drainage editorial team and informed by licensed-contractor sourcing, manufacturer documentation, and established industry standards for Downspout Drainage. Read our editorial standards.