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Tamko Home Additions & ADU: The Sacramento Owner’s Guide
If you’re planning a home addition or ADU in Sacramento and want Tamko roofing or weatherproofing materials specified into the project, we can help. A full home addition in Sacramento typically runs $45,000 – $130,000, and an ADU construction project ranges from $90,000 – $220,000 depending on size, foundation work, and the finishes you choose. Most owners don’t “discover” this the way you’d notice a broken spring or a leaking valve. Instead, they notice the ceiling stain in the spare room, the draft along the back wall, or the inspector’s note about flashing on an older addition that was never flashed right in the first place. That’s when the question becomes: who actually knows how Tamko materials should be installed, and who’s going to stand behind the work?
Which Tamko Models This Applies To
Tamko makes a full line of roofing, waterproofing, and decking products, but the ones we see most often on Sacramento additions and ADUs are the Heritage shingle series, the Proline system, and Tamko’s Ice & Rain underlayment. The gotcha most owners don’t realize until it’s too late: Tamko’s underlayment and shingle lines are rated for different slope minimums, and a low-slope addition roof (under 2:12 pitch) needs a different Tamko product than the original house roof did. Slapping the same shingle on a flatter addition because “that’s what’s on the main house” is exactly how you end up with a leak inside two Sacramento winters.
When we quote a job, we verify two things before we write a number: what Tamko product is currently on the structure, and what the roof slope actually measures. If you don’t know which Tamko shingle you have, check the original invoice or look for the bundle wrapper in the garage. No wrapper, no invoice? We’ll pull a sample and match it. For most Sacramento additions we recommend OEM Tamko products rather than aftermarket equivalents, because Tamko’s material warranty only applies when the whole system (deck, underlayment, shingles) is from the same manufacturer. A mixed system voids the warranty and opens the door for finger-pointing if something fails.
Styles & brands we work with
Signs Your Tamko Home Addition or ADU Is Failing
- Soft spots in the ceiling drywall or at wall-to-roof joints. This usually means a Tamko underlayment seam failed or was never properly lapped during the original addition build. Water travels down, pools, and soaks the drywall before you see the stain.
- Shingle granule loss collecting in gutters at the addition’s roofline. Tamko shingles lose some granules initially, but a steady accumulation of grit three to five years in suggests the slope wasn’t right for the product installed, and the shingles are wearing prematurely.
- Daylight visible through the attic at the addition-to-main-house transition. This is a flashing failure at the most common failure point on any Sacramento addition: where the new roof plane dies into the existing house wall. Tamko makes step flashing for exactly this transition, but it has to be integrated correctly, not just nailed on top.
- Musty odor or mildew staining on the ADU’s interior wall shared with the original garage. Moisture is migrating through the wall assembly, which typically points to missing or incorrectly installed Tamko Ice & Rain membrane at the base flashing line.
- Wrinkled or buckling Tamko membrane visible at roof edges. Sacramento’s summer heat (we regularly see 100-degree weeks in July and August) expands roofing material. If the original installer didn’t leave the right expansion gap at perimeter flashing, the membrane buckles, splits, and channels water instead of shedding it.
See the difference
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After
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AfterReplacement Cost & What’s Included
For Sacramento homeowners with a failing Tamko roof assembly on an addition or ADU, you’re not usually looking at a “part replacement.” You’re looking at a roof system correction on the addition, which we quote as a line-item job rather than a vague square-footage guess. Here’s what honest numbers look like in this market:
- Roof replacement on the addition only (Tamko shingles, new underlayment, flashings): $8,000 – $20,000 depending on square footage, tear-off disposal, and whether the existing deck sheathing is sound.
- Roof repair for a localized Tamko flashing or underlayment failure: $400 – $1,800 depending on how far the water has traveled and whether interior drywall needs repair afterward.
- Full ADU construction with Tamko roofing specified from day one: $90,000 – $220,000 in Sacramento. This includes permits, foundation, framing, roofing, mechanicals, and finishes. The roof is a small slice of that total, but it’s the slice that protects everything else.
- Home addition (bedroom, bath, family room) with Tamko roof integration: $45,000 – $130,000, driven by whether you’re on a slab or raised foundation, how much kitchen or bath plumbing is involved, and which cabinet and countertop lines you choose.
Every number we hand you is a written price, not a ballpark. The price on day one is the price on the invoice. That’s the Kingswell Way, and it’s been the operating standard since 2004. Every job also carries our 365-Day Done Right Promise in writing: if the work fails inside a year, we come back and fix it at no charge. No service call, no re-inspection fee, no fine print.
DIY or Call Us?
You can safely check a few things yourself: look at the roofline for missing shingles, check gutters for granule buildup, and shine a flashlight into the attic at the addition-to-house transition to spot daylight. If you see what looks like a small flashing gap, don’t grab the caulk gun. The fix that looks simple from the ground is rarely simple once you’re on the roof, and a bad patch job just moves the leak somewhere harder to find. Roofing and waterproofing on an addition is not a handyman repair. It’s a system that has to work as a coordinated whole: deck, membrane, flashing, and shingle all doing their jobs together. When we come out, Trevor Nash or one of the crew will walk you through exactly what’s failing and what it costs to fix it right. Call (279) 300-1177 and we’ll come take a look. The estimate is free.
FAQs
A properly installed Tamko shingle roof in Sacramento’s climate should last 20 to 30 years. Our hot, dry summers and occasional heavy winter rain cycles put real stress on underlayment and flashing, so the weak link is almost always the transition points and the membrane details, not the shingles themselves. If the original addition roof was flashed incorrectly, you’ll see failure in year three or four, not year twenty. Call (279) 300-1177 if you want us to check your roofline and give you a straight read on what you have.
That depends entirely on where the failure is and how long it’s been leaking. A torn flashing at the addition-to-house connection can often be repaired for $400 – $1,800. But if water has been getting into the deck sheathing for more than one wet season, you’re likely looking at a tear-off and replacement, which lands between $8,000 and $20,000 on a typical Sacramento addition. We’ll tell you which one you actually need, and if we can repair it instead of replacing it, we will. Call (279) 300-1177 for an exact quote.
Most addition roof replacements in Sacramento take two to four working days, depending on tear-off complexity, the condition of the existing deck, and whether we’re re-flashing a complicated transition where the addition roof meets the original house. We give you a defined arrival window before we start, and we leave the job site clean every afternoon. If you want a written timeline before committing to anything, call (279) 300-1177 and we’ll put it in the quote.
We keep Tamko underlayment, step flashing, and common shingle colors available through our Sacramento suppliers, and we can usually have less common Tamko lines on site within a few days. We also work extensively with KraftMaid, Cambria, and Silestone when your addition involves cabinetry or countertops, so the roof and the finishes get specified by the same team instead of three different subs. Call (279) 300-1177 and we’ll tell you what’s available and what the lead time actually looks like.
Written by Trevor Nash, Owner, Penhallow Remodeling Sacramento at Penhallow Remodeling Sacramento, serving Sacramento and nearby areas.
