Planning · 5 min

How to size gutters for San Diego homes

Undersized gutters overflow in a real storm. Oversized gutters look wrong on the home and cost more for no benefit. Sizing is a simple calculation based on roof area and local rainfall rate.

What you'll learn

  • How to calculate the roof area that drains to each gutter run
  • Which gutter width (5-inch vs 6-inch) handles San Diego rain loads
  • How many downspouts a single gutter run actually needs
  • Why steep roofs and wide eaves change the sizing calculation

Step by step

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Safety note

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