5" vs 6" Gutters in Western Washington: Which Size Is Right?

Why Gutter Size Matters Here

Western WA sees long, soaking rains and sudden downpours. The right gutter size helps prevent overflow, fascia rot, and foundation issues.

Quick Rule of Thumb

5″ K-style: Works for many average-size roofs with standard pitches.
6″ K-style: Better for larger roofs, steep pitches, big valleys, and areas with heavy overflow. The wider trough and 3″x4″ downspouts move more water—great for PNW cloudbursts.

When to Choose 6″

You regularly see water overshooting your current gutters.
Long runs feeding into a single corner (common overflow point).
Multiple valleys directing water into one section.
You have tall firs or cedars dropping needles—larger downspouts resist clogs.

Downspouts, Hangers & Slope

Upgrade to 3″x4″ downspouts for volume and debris resistance.
Use heavy-duty hidden hangers for strength in storms.
Correct slope (pitch) keeps water moving without standing puddles.

Leaf Protection for Fir Needles

Micro-mesh styles resist fine needles best.
Avoid covers that create a “shelf” where needles pile up.
Plan seasonal maintenance—guards help, but nothing is 100% maintenance-free.

Materials & Color

Seamless aluminum is popular, with baked-on finishes to match trim.
Steel is strong but can be heavier; copper is premium and develops a patina.

We’ll size your gutters properly and show you the best options for your rooflines. Book a free gutter assessment today.

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North Cascade Home Services delivers premium roof, gutter, and exterior replacements built for Pacific Northwest homes. Trusted craftsmanship. Local expertise. Lasting results.

5" vs 6" Gutters in Western Washington: Which Size Is Right?