IKO Ridge Vent Installation in Seattle, WA

IKO Ridge Vent Installation: The Seattle Owner’s Guide

IKO ridge vent installation in Seattle typically runs $340-$780 depending on linear footage, roof pitch, and whether we’re matching existing IKO ArmourVent or upgrading to a compatible IKO Pro4 system. We stock IKO-compatible ridge vent profiles on every truck and can usually complete the job same day in neighborhoods from Magnolia to Mount Baker. Most homeowners first notice the problem during our wet months, when a faint drip line appears on the ceiling directly below the ridge, or when the bathroom fan seems to push moist air back into the attic instead of out through the peak.

Call (866) 850-9676

Which IKO Models This Applies To

IKO has shipped three distinct ridge vent systems in the Pacific Northwest over the past two decades, and mixing them causes the compatibility headaches we see most often.

• IKO ArmourVent - The rolled mesh style common on IKO Cambridge and Marathon Plus installs from the early 2000s through roughly 2018. Check for the grey woven polypropylene mesh and the 11.5-inch exposed width. We still carry this profile, though IKO has shifted production toward newer designs.
• IKO Pro4 Ventilation System - The rigid, externally baffled vent introduced with IKO’s Performance shingle lines. This one measures 12 inches exposed and uses a nail flange spacing that’s slightly different from ArmourVent. The baffling handles Seattle’s wind-driven rain better, which matters on exposed ridges facing Puget Sound.
• IKO GoldShield Ridge Vent - A contractor-grade rigid vent with integrated weather filter, seen on newer IKO Dynasty and Nordic installs. The 13-inch width and deeper external baffle create a different shingle-over profile that doesn’t sit flush if you try to marry it to older systems.

Here’s the gotcha we find on maybe one in four Seattle inspections: a previous roofer bridged two different IKO vent styles at a ridge addition or dormer junction, creating a gap that traps condensation. The mesh-to-rigid transition never seals properly. We always match the existing profile exactly, or replace the full ridge run to a single compatible system. Aftermarket equivalents exist for ArmourVent (we’ve used Lomanco’s OMNI roll with good results on lower pitches), but for Pro4 and GoldShield we specify OEM IKO to maintain the baffling geometry that handles our horizontal rain.

Identification tip: IKO prints a small batch code on the nail flange of rigid vents, usually visible from the attic side. If you can safely access your attic peak, photograph that code and we’ll cross-reference it before we roll the truck.

Signs Your IKO Ridge Vent Installation Is Failing

• Water staining on the ceiling directly below the ridge line. Seattle’s wind-driven rain finds its way through deteriorated mesh or lifted nail flanges. The stain often appears as a faint yellow-brown line running parallel to the ridge, not a round spot like you’d see from a nail pop.
• Attic feels damp or smells musty even in dry August weather. A functioning ridge vent creates passive airflow from soffit to peak. When the vent clogs with pollen, moss debris, or collapsed mesh, that convection stalls and moisture accumulates. We’ve pulled vents in Capitol Hill attics that were 40% blocked by decades of maple helicopter seeds.
• Shingle granules collecting in the attic near the ridge. This means the vent slot was cut too wide originally, or the vent itself has shifted, allowing shingles to rub and shed directly into the opening. It’s both a ventilation failure and a sign your IKO shingles are taking unnecessary wear.
• Ice dam formation directly below the ridge in January. Warm, moist air that should exit through the peak instead melts snow from underneath, which refreezes at the eave. On north-facing slopes in View Ridge or Wedgwood, this pattern often traces back to a ridge vent that’s venting poorly or not at all.
• Visible sag or dip in the ridge line from the street. The vent slot cut through the ridge board weakens the structural line. If the original installer removed too much material or the vent wasn’t properly supported, the ridge can settle over years of wet Pacific Northwest cycles. This one’s past a parts swap and needs structural assessment.

Replacement Cost & What’s Included

What drives the range: roof pitch above 8/12 adds labor time and safety rigging; cedar shake tear-off underneath requires different fastening; and accessibility issues like a two-story wall abutting the ridge. Our quote includes the vent material, removal and proper disposal of the old unit, re-cutting the slot if it’s uneven, ice-and-water shield at the transition points, and new IKO-approved fasteners. We warranty the installation under our 90-Day Done Right Promise, and the IKO OEM products carry their own material warranty when we register the install. The number we quote is the number on the invoice.

DIY or Call Us?

There’s a safe middle ground here, and then there’s where DIY goes wrong.

What you can check from inside: shine a flashlight along your attic ridge board and look for daylight showing through gaps, water staining on the rafter ties, or the vent material itself sagging or pulling loose. Note the vent style and any visible markings. That’s useful information, and it costs nothing.

What we don’t recommend: cutting a ridge slot, working on a roof pitch above a gentle 4/12, or trying to bridge two incompatible vent systems. The ridge is the structural spine of your roof. Remove too much material and you’ve compromised the rafter connection. Install the wrong baffling profile and Seattle’s February wind will drive rain straight into your attic. We’ve been called to fix DIY ridge vent jobs in Ballard and Beacon Hill where the homeowner saved $300 and cost themselves $2,400 in water damage repair.

Our technicians carry IKO-compatible ridge vent on every truck. Call (866) 850-9676 and we’ll confirm the match from your photos, quote upfront, and schedule the fix.

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