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How-To & Guides 7 min read • May 29, 2026

Seamless Gutter Sizing for Texas Downpours: 5-Inch vs. 6-Inch & Downspout Rules

Why 5-inch gutters overflow during severe Texas thunderstorms. Sizing gutters, downspout placement, foundation splash guards, and leaf protection systems.

Torrential Texas thunderstorms can dump 2 to 3 inches of rain in an hour. Under-sized gutters overflow and pool water directly against concrete foundations, accelerating expansive clay foundation movement.

Gutter Sizing Guidelines

Gutter SizeRoof Drainage CapacityDownspout Size Required
5-Inch K-StyleUp to 5,500 sq ft roof drainage2" x 3" standard downspouts
6-Inch K-Style (Recommended)Up to 7,900 sq ft roof drainage3" x 4" high-flow downspouts
7-Inch Commercial BoxLarge commercial / metal roofs4" x 5" commercial downspouts

Frequently Asked Questions

Should I get 5-inch or 6-inch gutters in Texas?

6-inch seamless gutters are strongly recommended for Texas homes. 6-inch gutters hold roughly 40% to 50% more rainwater volume than 5-inch gutters, preventing overflow during torrential Texas downpours.

How much do seamless aluminum gutters cost per linear foot in Texas?

6-inch seamless aluminum gutters typically range from $7.50 to $12.50 per linear foot installed, including heavy-duty hidden hangers, end caps, and 3x4 inch downspouts.

How do gutters protect Texas foundations?

Gutters channel roof runoff at least 5 to 10 feet away from the foundation slab, preventing the perimeter soil from cycling between saturated mud and bone-dry clay, which causes slab cracking.

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