Sizing discussion tool

Could your roof need more gutter capacity?

Explore the factors that shape a sizing conversation. This deliberately avoids claiming that a few inputs can replace roof measurements and a property inspection.

Close view of an aluminum gutter, roof edge and downspout outlet — Small connection details determine how the full gutter system collects and moves water.

Professional installing a seamless aluminum gutter on a brick home — A complete installation coordinates the roof edge, hangers, outlets and downspouts.

Approximate roof area 1 800 sq ft

Roof pitchConcentrated valleys 1

Longest gutter run 55 ftCurrent downspouts 3

Roof area and pitch

Larger or steeper collection areas can deliver more water to a run over a short period.

Valleys and long runs

Concentrated flow and long travel distances can make outlet placement as important as gutter width.

Downspout configuration

A larger gutter feeding too few or undersized outlets can retain the same bottleneck.