Your Roof and Gutters Are One System
Your roof and gutters are two halves of one drainage system. A pristine architectural shingle roof does little good if the gallons of rainfall washing down its slopes back up at the eaves.
When the drainage half fails, the roof half fails with it. Water that overflows a gutter has nowhere to go but behind the fascia board and up under the lower shingle courses — the exact spot where ice-and-water shield ends and the roof is most vulnerable.
Why Standard 5-Inch Gutters Fail in Atmospheric Rivers
During our notorious Pacific Northwest atmospheric river storms, standard 5-inch sectional gutters struggle to handle the torrential volume. Pine needles and fir cones quickly clog narrow drop outlets, causing gutters to overflow.
When gutters back up, water pools beneath lower shingles, rotting the roof deck edge and soaking fascia trim. The damage is gradual and hidden — by the time the fascia is soft enough to notice, the roof edge and deck have been wet for months.
The Seamless 6-Inch Solution
We recommend seamless 6-inch K-style aluminum gutters fabricated on-site to match the exact length of your eaves. The upgrade solves the three problems that cause most gutter failures in Western Washington:
- Capacity — 6-inch gutters carry roughly 40% more water than 5-inch, enough to stay ahead of atmospheric river downpours.
- Seamless construction — fabricated in one continuous run per eave, eliminating the joints that pull apart, freeze-split, and leak.
- Oversized downspouts — 3x4-inch downspouts move water away from the foundation fast instead of backing up at the outlet.
Drip Edge: The Missing Link Between Roof and Gutter
Drip edge flashing must properly overhang into the gutter trough to prevent capillary water from running behind the gutter and rotting the fascia board. Many older Puget Sound homes were built without drip edge, or with it installed incorrectly tucked under the felt.
When we install or replace gutters, we verify the drip edge extends past the back of the gutter so water drops cleanly into the trough rather than wicking back up under the shingle and down the fascia. It is a small detail that prevents the most common cause of fascia rot.
Warning Signs Your Drainage System Is Failing
If you notice any of these, your roof-and-gutter drainage system is waving a red flag:
- Water cascading over gutter rims during heavy rain — the gutter is undersized or clogged.
- Dark stains or green algae on the fascia board behind the gutter — water is running behind, not into, the trough.
- Erosion or washed-out mulch directly below the eaves — downspouts are dumping water too close to the foundation.
- Sagging or pulling gutters — the hangers have failed, often from the weight of standing water and debris.
