Why does an inspector note a downspout that discharges beside the foundation?

A downspout concentrates the runoff from a large roof area into a single point, and discharging it beside the foundation puts that entire volume into the backfill zone. An inch of rain on a modest roof section is hundreds of gallons, delivered to a few square feet of ground directly against the wall. The backfill is disturbed and more permeable than the surrounding soil, so the water travels straight down to the footing, producing hydrostatic pressure and saturating the soil that supports it. Repeated saturation and drying can also contribute to settlement. The remedy is cheap and effective — extensions, splash blocks carrying water beyond the backfill, or a buried line to a suitable discharge point — which is why this is one of the highest-value findings in a report on a house with basement moisture.

A downspout concentrates a large roof area's runoff at one point, and discharging it at the wall saturates the permeable backfill and delivers water directly to the footing.

Roof drainage should be carried well away from the foundation. Downspouts concentrate large volumes at single points, and discharge adjacent to the wall saturates backfill, producing hydrostatic pressure and contributing to basement moisture.

One Spout, A Whole Roof. Hundreds of gallons landing on a few square feet of the loosest soil on the property.

Check that extensions have not been removed for mowing and that buried lines actually discharge — a blocked buried line delivers the water back at the foundation invisibly.

• •Confirming extensions exist without checking where the grade takes the water
• •Missing blocked or disconnected buried discharge lines
• •Treating downspout discharge separately from basement moisture findings