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IKO Ridge Vent Installation: The San Francisco Owner’s Guide
We stock and install IKO-compatible ridge vents throughout San Francisco, with most installations priced between $550 and $1,100 depending on the linear footage of your ridge line, roof pitch, and access. Same-week scheduling is typical, and we’ll always give you the written price before any work starts. Most San Francisco homeowners discover a ridge vent problem the same way: a musty attic smell after a long fog stretch, paint starting to bubble near the ceiling, or moisture stains that appear and then worsen through the winter rainy season.
IKO ridge vents are a specific profile, and getting the match right matters more than most homeowners expect. The vent sits along the peak of your roof and does double duty: it pulls warm, damp air out of your attic while stopping wind-driven rain from pushing back in. When the vent’s baffle matting breaks down or the profile no longer seals against IKO’s cap shingles, the system quietly fails, and you don’t find out until you’re standing under a drip.
Which IKO Models This Applies To
IKO’s ridge vent lineup includes the Armour Vent series and the Fast Fit ridge vent, both designed to pair with IKO’s architectural shingle profiles like Cambridge, Dynasty, and Nordic. The Armour Vent is a rigid molded polypropylene vent that comes in 4-foot sections with a distinctive baffle pattern. The Fast Fit uses a flexible hinge design that can bend to match steeper roof pitches. If you have IKO cap shingles installed, which is the standard finish over these vents on most San Francisco roofs, the vent channel width needs to sit inside the cap shingle’s exposure or water works its way underneath.
The gotcha we see on older San Francisco roofs is mixing vent profiles. A crew that ran short will sometimes finish a ridge run with a different manufacturer’s vent, and the two profiles don’t join cleanly. The joint opens over time and the attic starts pulling in fog moisture. If you’re not sure which vent you have, look at the end profile at the gable edge or in the attic: Armour Vent shows a rigid grid core, while Fast Fit shows a more open, flexible baffle weave. IKO makes a quality vent. We typically install the OEM part rather than aftermarket equivalents because the cap shingle fitment is tuned to IKO’s own profile.
- We stock IKO Armour Vent and Fast Fit, both in 4-foot sections, ready to install
- Mixing IKO ridge vent with other brands at the same ridge line is the most common long-term failure we correct in San Francisco
- Get a written price for the full install before we start, no exceptions
Styles & brands we work with
Signs Your IKO Ridge Vent Installation Is Failing
- Attic humidity that climbs in the summer, not just winter. San Francisco’s marine layer sits on top of your roof for hours each morning. A working ridge vent releases that moisture; a plugged one traps it against your sheathing, and you’ll see the humidity number rise on a warm afternoon.
- Drip marks on attic insulation directly under the ridge line. When water does get past the vent, it follows the underside of the roof deck and drips at the highest point inside the attic. Stains that run parallel to the peak are usually the vent, not a shingle leak.
- Granule loss or cracking on cap shingles at the peak. IKO cap shingles take more UV and wind fatigue than field shingles. Once a cap shingle cracks at the fold, water channels through and lands directly on the vent’s supporting frame.
- Daylight visible between the vent profile and cap shingle. From a safe spot in the attic, look toward the ridge. A tight IKO vent installation shows no pinholes of light. If the vent has warped, pulled away, or been walked on, those gaps let wind-blown rain in during San Francisco’s sideways winter storms.
- A musty, enclosed smell in the upper hallway, not just the attic. Fog moisture that can’t escape condenses inside wall cavities near the ceiling line. The tenant or homeowner notice is usually a smell that comes and goes with the weather.
Replacement Cost & What’s Included
For a typical San Francisco home with 30 to 50 linear feet of ridge, an IKO ridge vent replacement runs between $550 and $1,100 including the vent sections, new cap shingles, fasteners, and labor. The range moves with roof access: a two-story Victorian in the Mission with a steep pitch and a flat section up top takes longer than a single-story bungalow out in the Avenues with a walkable roof.
What’s included: removal and disposal of the old vent and cap shingles, inspection of the underlayment along the ridge, installation of the matching IKO vent sections, cap shingles to finish, and sealant at every joint. If we find rotted sheathing along the ridge, we’ll show you a photo and quote the plywood replacement before touching it. The 365-Day Done Right Promise applies to this work. If it’s not right, we make it right.
See the difference
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After
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AfterDIY or Call Us?
You can safely do some useful checking from inside: look at attic insulation for drip patterns, check for daylight at the ridge, note any cap shingle damage. What we’d caution against is working on the ridge itself. A ridge vent sits at the highest point of your roof, usually above a steeper slope in San Francisco, and every step you take changes the loads on your shingles. Falls from even a low roof change lives, and carrying a 4-foot plastic vent while balancing on a cap line is not a one-person job. We also see homeowners damage sound cap shingles trying to remove the old vent without the right flat bar technique.
If you want to confirm what you have before calling, note the vent brand marking on the end cap or underside and measure the total ridge length from inside the attic. We’ll take it from there. Call (831) 228-3330 and we’ll get you on the schedule for a look.
How We Work Inside and Around Your Home
We know homeowners in San Francisco care as much about the inside of the house as the roof. A ridge vent job is a small job, but it still involves climbing on your roof, bringing up tools and materials, and moving around your property. Here’s what to expect from us: shoe covers at the door before we set foot inside, drop cloths through any hallway or stair path if we need attic access, and all debris bagged, carried down, and photographed before we leave. We use pet-safe products where there’s a choice, and if your dog stays home during the visit, we’ll coordinate the door schedule with you so there’s no accidental escape. We finish every job with a clean-up photo before the crew leaves.
Our crews follow the straight rules: Clean up like it’s our own home. Ask before we move or touch anything. Respect your time and quiet hours. Explain the price before the work begins. That’s what every homeowner should expect, and we put it in writing.
FAQs
An IKO ridge vent installed correctly in San Francisco typically lasts 15 to 20 years, which lines up with the life of the cap shingles above it. Our salt-heavy fog air accelerates corrosion on the fasteners and UV ages the plastic faster than inland California, so we recommend having the ridge checked every 3 to 5 years as part of a roof tune-up. Call (831) 228-3330 if you want us to take a look before the fall rains.
If a single section is cracked or a joint has opened, we can sometimes replace that one 4-foot piece and re-seal it. But if the baffle matting is crumbling across multiple sections or the cap shingles are failing, a full vent replacement is cheaper per year of life than piecemeal patching. We’ll show you what’s happening and quote both options before anything moves.
A standard IKO ridge vent replacement on a single ridge line takes about 3 to 5 hours, including set up, removal, installation, and clean-up. Attic access checks and heavier cap shingle damage can add time. You’ll have a clear window from us before the day starts, and we won’t leave until the site is clean and photographed.
Yes, we keep IKO Armour Vent and Fast Fit sections on the truck for standard ridge lengths, along with matching cap shingles for Cambridge, Dynasty, and Nordic profiles. We also stock GAF, Owens Corning, and CertainTeed equivalents if your existing ridge isn’t IKO. If it’s on the roof, we can usually match it.
Written by Erik Lindgren, Owner, Birchbark Roofing San Francisco at Birchbark Roofing San Francisco, serving San Francisco and nearby areas.
If your IKO ridge vent is showing signs of failure, don’t nurse it through another wet winter. Call (831) 228-3330 for a free estimate. You’ll get a straight answer, a written price, and a name behind the work.