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Tamko Home Additions & ADU: The San Diego Owner’s Guide
If your Tamko product is failing or needs replacement parts in San Diego, we can source and install Tamko-compatible components as part of a larger home addition or ADU project. In San Diego, a home addition built with Tamko materials typically runs $53,100 – $153,400 installed, and we can usually get your project quoted within a few days of the initial walkthrough. Most owners discover they need us when they notice water staining at the roofline, delaminating edge flashing, or a Tamko shingle surface that’s shedding granules faster than the manufacturer’s wear rating suggests. The first call usually starts with “I think my roof is failing” and ends with a written price and a plan.
We are an independent general contractor serving San Diego County. We are not affiliated with Tamko, but we work with their product lines regularly and know what holds up in coastal salt air versus inland heat.
Key Takeaways:
- Tamko product failures in San Diego are usually flashing-related, not shingle-related
- We provide a written price before any work starts, no exceptions
- Every project is covered by our 365-Day Done Right Promise, in writing
- Call (619) 604-9624 and a real person answers, any hour
Which Tamko Products This Applies To
Tamko makes a range of building products, but the ones we see in home additions and ADU projects across San Diego are their roofing shingle lines (Heritage, Heritage II, and StormShield) and their waterproofing membranes used under stucco and behind stone veneer. The compatibility gotcha that catches homeowners: Tamko’s self-sealing shingle strip activates at a specific temperature, and in San Diego’s mild coastal zones, that strip can take longer to bond than it would in Phoenix or Las Vegas. If you’re adding a second story or a new ADU roof, the existing shingle deck needs to be checked for proper tab adhesion before tying into it. This is a checkable detail that matters for warranty compliance and long-term watertightness.
When we assess an existing Tamko installation, we check the shingle gauge, the exposure (how much of each shingle is showing), and whether the original installer used Tamko-approved underlayment. A huge number of failures we see in San Diego aren’t the shingle’s fault. They’re what’s underneath it or what’s flashed against it. For replacement, we default to OEM Tamko material when the existing roof is still under the manufacturer’s coverage, because mixing lines voids the warranty. When the roof is past warranty, we’ll talk through quality aftermarket equivalents that match the profile and color range, and give you a number for both options.
Other brands we work with and source parts for: KraftMaid, Cambria, and Silestone. If you’re doing a kitchen or bath as part of your addition, we can coordinate those materials under the same written price.
Styles & brands we work with
Signs Your Tamko Home Addition or ADU Roof Is Failing
- Granule loss collecting in gutters or at downspout bases. In San Diego, the combination of UV exposure and salty marine air accelerates granule shedding. If you see a tablespoon of granules per foot of gutter after a dry week, the shingle’s protective layer is thinning faster than normal. This means the asphalt substrate is next, and that’s when leaks start.
- Curling or lifting at shingle edges, especially on south-facing slopes. San Diego sun is unforgiving. Tamko shingles are rated for specific temperature ranges, and when the attic ventilation is inadequate, trapped heat cooks the shingle from below while the sun bakes it from above. Curling is the first visible symptom of a ventilation problem, not just a shingle problem.
- Water staining on ceiling drywall directly beneath roof valleys or around plumbing vent pipes. This is nearly always a flashing failure, not a shingle failure. The rubber boot around a plumbing vent rots in San Diego’s sun-and-salt cycle in about 8 – 12 years. The shingles around it may still have half their life left.
- Visible cracking or delamination at the rake edge. The rake edge is the angled roofline at the side of the house. If the Tamko material is delaminating there, it’s usually because the edge wasn’t properly sealed at installation, and wind-driven rain has been working its way under the field for years. By the time you see it, the deck sheathing often needs repair too.
- Mold or mildew creeping under roofline trim on an ADU that’s been up less than five years. This is the one that bothers me most. A properly flashed Tamko roof on an ADU should be bone-dry under the eave. If you’re seeing darkened wood or paint bubbling, the step flashing where the ADU roof meets the main house wall is the usual culprit.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
In San Diego, a full replacement of a Tamko roofing system as part of a home addition or ADU project falls within the broader project range of $53,100 – $153,400. That’s not a roofing-only number. That’s the addition or ADU build that includes the roof, structure, dry-in, and finishing. For roof replacement work specifically, San Diego pricing runs $9,440 – $23,600 depending on square footage, pitch, tear-off requirements, and whether we’re tying into an existing structure or doing a standalone ADU.
What drives the number up: steep roof pitches that require staging, multiple roof planes or valleys, existing deck repairs, and whether the county requires a cool-roof compliant product for your specific ADU situation. What drives it down: a simple single-plane addition, easy access, no existing damage beneath the old roofing.
Every quote we give is a written price, not a range. The number we write before the project starts is the number on the invoice. No change orders for things we should have caught at the walkthrough. And every roof we install is covered by the 365-Day Done Right Promise. If a leak shows up within the year, we come back and fix it at no charge.
DIY or Call Us?
Here’s my honest take, and I’ll say it plainly: roof work involving nails, flashing, and any kind of height is not a weekend DIY project. A fall off a one-story roof in San Diego can leave you with a broken hip and a half-finished project. I’ve seen homeowners attempt their own flashing repair around a skylight, only to have a bigger leak three months later because they used the wrong sealant against the Tamko shingle’s granulated surface. Certain materials are not chemically compatible, and that’s not something a YouTube video covers well.
What you can safely check yourself: clean your gutters, look for or write down where the staining appears on the ceiling, and take photos of any visible damage from the ground. That information makes your phone call more productive. But the moment you’re leaning a ladder against the fascia and thinking about popping a shingle with a pry bar, stop. Call us. A real person answers at (619) 604-9624, any hour, and we’ll walk through what you’re seeing and give you a straight answer about whether it needs a repair or a full replacement. Tell me what you need, I’ll tell you what it costs, and we’ll go from there.
FAQs
A Tamko architectural shingle roof in San Diego’s climate typically lasts 18 – 25 years, which is a few years shorter than the same roof in a milder inland climate because salt air and intense UV exposure wear the granule layer faster. The key variable is attic ventilation; properly ventilated roofs in San Diego regularly hit the top of that range.
Yes, isolated flashing failures around vents, chimneys, and valley transitions can frequently be repaired without replacing the entire roof, and that repair typically runs $470 – $2,125 in San Diego depending on the linear feet affected. The catch is that if the flashing failure has been leaking long enough to rot the deck sheathing, the repair scope expands. Call (619) 604-9624 and we’ll tell you which situation you’re in.
An ADU addition in San Diego typically takes 4 – 8 months from permitting to final inspection, depending on the county’s plan-check backlog and whether you’re doing a garage conversion or a ground-up build. The roofing portion itself is one of the shorter phases (usually 1 – 2 weeks for a full tear-off and replacement), but the schedule around it is set by drainage, foundation, and electrical work.
We stock common Tamko-compatible flashing components, valley metal, and underlayment on our trucks, but for a full re-roof we order the shingle pallets directly from our San Diego supplier once you’ve approved the color and line. That ordering step usually adds 3 – 5 business days to the schedule, and we factor it into the written timeline before you sign anything.
If your Tamko roof, flashing, or waterproofing is giving you trouble in San Diego, call (619) 604-9624 for a free estimate. The price is written, the guarantee is written, and the number you get before we start is the number you’ll see at the end.
Written by Trevor Nash, Owner, Penhallow Remodeling San Diego at Penhallow Remodeling San Diego, serving San Diego and nearby areas.
