SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-downspout-4ft

How far beyond the foundation wall should downspout extensions discharge water?

At least 4 feet.

Start playing free

  1. At least 6 inches
  2. At least 4 feet ✔
  3. About 1 foot

Why: Extensions or splash blocks carry roof water away from the foundation. UMN Extension recommends at least one downspout per 50 linear feet of eave.

Huh, didn't know that: A downspout without an extender or splash block is worse than no downspout at all.

The dad joke
Is there anything worse than when it's raining cats and dogs? Yes, hailing taxis.
Like this card?
Play the game

References

Answer: At least 4 feet. Extensions or splash blocks carry roof water away from the foundation. UMN Extension recommends at least one downspout per 50 linear feet of eave.

  1. UMN Extension: Moisture in basements extension.umn.edu/garden-and-home/home-maintenance/caring-for-a-home/moisture-in-basements-causes-and-solutions
    Extensions should discharge water at least 4 feet beyond the wall.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Home & YardHow should the soil next to your foundation slope?Home & YardIn a 1-inch rain, about how much water falls on the roof of a 2,000 square foot house?Home & YardHow far from a house wall should large trees like oaks and maples be planted, at least?

That's stuff everyone should know.