Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
IKO Roofing: The San Jose Owner’s Guide
We install and repair IKO roofing systems across San Jose, and most IKO-specific repairs run $470 – $2,125 depending on what failed and how much decking or underlayment needs attention. If you’re reading this, you’ve probably spotted a lifted shingle, a leak in one corner of the ceiling, or granules collecting in your gutter after a storm. That’s usually how IKO owners discover a problem: small, specific, and easy to ignore until the next rain. We’ll walk you through what matters, what it costs, and whether you need us at all. Trevor Nash has been running remodeling and roofing-adjacent exterior projects for nearly two decades, and the Willow Glen homes he’s worked on taught him one thing about IKO roofs: the failure is rarely the shingle itself. It’s what’s underneath.
Which IKO Models This Applies To
IKO makes several shingle lines, and the part that fails, how it fails, and what it costs to fix all depend on which line you have. The three you’ll most likely find on San Jose homes built or re-roofed in the last 15 years are Cambridge, Marathon, and Royal Estate. Cambridge is the most common architectural shingle in IKO’s lineup; Marathon is their heavier-duty architectural line; Royal Estate is the premium architectural with a wider exposure and different nailing pattern. They are not interchangeable. A Cambridge shingle is roughly 13-1/4 inches wide with a 5-5/8 inch exposure. Royal Estate runs wider, and the nail line sits in a different position relative to the adhesive strip. If someone slaps a Cambridge shingle into a Royal Estate course, the seal won’t sit right and the wind rating effectively disappears.
The surest way to identify what you have: look for the IKO production label on the underside of a shingle (printed during manufacturing), or check your original roof invoice. If neither is available, measure one full shingle width and the exposed tab height. As for OEM versus aftermarket: IKO warranties are tied to their own shingles, not to generic substitutes. A quality aftermarket shingle from a different manufacturer will keep water out, but it will not match the color, the profile, or the warranty stack. For a repair that has to look like it never happened, stick with the IKO line you already have. For a roof that’s past its useful life anyway, we’ll tell you straight and give you options.
Styles & brands we work with
Signs Your IKO Roofing Is Failing
- Granules in the gutter or at downspout openings. IKO shingles shed some granules early in their life as part of normal curing. Heavy, ongoing granule loss, especially bare asphalt showing through, means the shingle’s UV protection is spent. In San Jose’s summer heat, that happens faster on south-facing slopes.
- Lifted or unsealed tabs after a wind event. The adhesive strip on an IKO shingle needs heat and time to bond. If the roof was installed in cooler weather or the shingles got dusty before sealing, tabs can lift. Once lifted, wind gets under them and starts peeling entire courses.
- Cupping, curling, or a wavy roof plane. This usually points to trapped moisture in the decking or underlayment, not the shingle itself. The shingle is just revealing the problem. San Jose homes with older plywood decking and minimal attic ventilation see this more than people expect.
- Ceiling stains or damp insulation in the attic. This is the one that gets homeowners on the phone. By the time water reaches the ceiling, it has likely traveled along a rafter or a deck seam. The visible stain is rarely directly under the actual breach.
- Nail pops or shiners (visible nail heads). A nail that works its way up through the shingle creates a direct water channel. On IKO architectural lines, the nail should be driven flush and covered by the shingle above. A shiner is an install defect, and it will leak eventually.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For San Jose specifically, a targeted IKO shingle repair runs $470 – $2,125 installed. That covers the diagnosis, the shingles, underlayment if needed, sealant, and labor. A full roof replacement on an IKO roof in San Jose typically runs $9,440 – $23,600 depending on square footage, tear-off, decking replacement, and which IKO line you’re installing. The wider repair range is driven by three things: whether the decking underneath has rotted (common on older San Jose homes with original plywood), how steep the roof is, and whether we’re matching an IKO color that’s still in production or tracking down a discontinued lot.
You get a written price before any work starts. Not a ballpark. A number. The price on day one is the price on the invoice. And every repair carries our 365-Day Done Right Promise: if the repair fails inside a year, we come back and fix it at no charge, with no service call fee and no re-inspection fee. That’s in writing, on every job, every time.
DIY or Call Us?
There are things an owner can safely check. You can look at the roof from the ground with binoculars and spot lifted tabs or missing shingles. You can check the attic for damp insulation after rain. You can clean your gutters so water isn’t backing up under the shingle edges. What you shouldn’t do is get on the roof. I can’t say it more plainly than that. A steep San Jose roof with a loose shingle is a fall waiting to happen, and walking on an older IKO roof can cause more damage than the repair itself. If the issue is on a single-story section with a walkable pitch and you have the right ladder, an experienced homeowner can sometimes swap a single shingle. But most of the failures we see involve the underlayment or the decking, and that’s not a weekend fix. If you’re unsure, call us at (669) 274-2362. We’ll look, we’ll tell you what’s actually wrong, and we’ll give you a written number before anyone picks up a tool.
FAQs
An IKO architectural shingle like Cambridge or Marathon typically lasts 20 – 30 years in San Jose’s climate, though south-facing slopes and poor attic ventilation can push that toward the low end. The real variable isn’t the shingle; it’s the installation and the ventilation behind it. A well-installed IKO roof with proper airflow will outlast the same shingle on a poorly vented roof by a wide margin.
Yes, if the damage is isolated to a small area and the decking underneath is sound. We repair individual shingles, small sections, and localized leak points regularly. The key is catching it before water has been getting in for months. If the decking is soft or the underlayment is compromised, the repair scope grows. We’ll show you exactly what we found before we write the number.
Most single-area repairs take 2 – 4 hours on site. That includes setting up, removing the damaged shingles, inspecting the underlayment and decking, installing the replacement, and sealing everything. If we find decking rot, we’ll need another day to schedule that work and the repair becomes a small replacement project. You’ll know the timeline before we start.
We keep common IKO Cambridge and Marathon colors on the truck for the San Jose market, along with the sealants, nails, and underlayment those repairs require. If you have a discontinued IKO color or a less common line like Royal Estate, we’ll source it directly and confirm the match before we schedule. We’d rather take an extra day than put a mismatched shingle on your roof. Call (669) 274-2362 and we’ll check availability while you’re on the phone.
Written by Trevor Nash, Owner, Penhallow Remodeling San Jose at Penhallow Remodeling San Jose, serving San Jose and nearby areas.
