Tamko Home Additions & ADU Nationwide

Tamko Home Additions & ADU: The Pomona Owner’s Guide

We stock and install Tamko-compatible components for home additions and ADU projects throughout Pomona, with typical installed pricing for addition work running $45,000-$130,000 and ADU construction at $90,000-$220,000 depending on foundation, utility tie-ins, and roof integration. Most Pomona homeowners first notice trouble when an addition’s roofline doesn’t shed water the way the main roof does, or when the ADU’s wall system shows moisture staining at the Tamko shingle-to-flashing junction after our Santa Ana wind seasons. We’ve seen this pattern enough in neighborhoods north of the 10 Freeway, where older ranch homes get second-story additions that weren’t originally designed for the load path.

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Which Tamko Models This Applies To

Tamko’s residential roofing lines, particularly the Heritage series laminated shingles and the Titan XT impact-rated line, appear frequently on Pomona additions and ADUs where the owner wants visual matching with the existing structure. The Heritage Vintage line, with its heavier shadow bands, is the usual choice when we’re tying into a 1980s or 1990s home near Ganesha Hills or the Lincoln Park corridor. To identify what you’ve got, check the shingle back for the Tamko stamp, which includes the plant code and date of manufacture; for Heritage, you’re looking for a fiberglass mat thickness of 1.8 to 2.2 pounds per square, while Titan XT carries a UL 2218 Class 4 rating that’s visible on the specification strip.

The OEM-versus-aftermarket question for Tamko comes down to color matching, not structural performance. Tamko runs color lots that shift slightly year to year, so a 2022 “Rustic Slate” isn’t identical to a 2016 “Rustic Slate.” We source current-production Tamko for the repair field and blend outward, or we spec a full-slope replacement on the addition if the mismatch would read from the street. For underlayment and accessories, we use Tamko’s MetalEdge drip edge and StormFighter IR synthetic underlayment, which carries the same 25-year warranty when installed as a system. Mixing brands here voids the material warranty, a detail some Pomona homeowners learn only when they file a claim after a wind event.

Signs Your Tamko Home Addition & ADU Is Failing

• Granule loss exposing the fiberglass mat. Tamko Heritage shingles shed granules faster on south-facing ADU roofs in Pomona’s inland heat, where summer surface temperatures hit 160°F. Once the mat shows, UV degradation accelerates and the shingle becomes brittle within two seasons.
• Curling or clawing at the shingle edges. This indicates the asphalt binder has aged out, common on additions built during the 2015-2019 rush when some crews used stockpiled material past its ideal install window. The shingles lift in wind and create entry points for driven rain.
• Flashing separation at the addition-to-house wall. The step flashing behind Tamko shingles on a second-story addition works as a system; if one piece lifts, water tracks behind the entire run. We find this most often where the original builder used generic flashing instead of Tamko’s matching MetalEdge profile.
• Interior staining on the addition ceiling after Santa Ana events. Pomona’s fall wind patterns test every roof-to-wall transition. If your ADU or addition shows new stains only after 40-mph gusts, the Tamko shingles are likely intact but the fastening pattern or starter strip has failed at the rake edge.
• Sagging ridge line on the new structure. This isn’t a shingle problem, it’s a framing problem, but Tamko’s Ridge Vent system can’t perform if the ridge board has settled. We check this first on older Pomona additions where the original contractor didn’t engineer for the dead load of laminated shingles over three-tab weight.

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Replacement Cost & What’s Included

What drives the range: square footage is obvious, but the hidden variables are roof pitch (steeper means more labor per square), whether the addition has independent HVAC or ties into the main house, and how the City of Pomona’s Planning Department classifies the structure for permit fees. Under Clause 1 of the Haven Standard, we deliver a written price before any work starts, with line-item breakdown for materials, labor, permits, and the documented photo record. No change proceeds without a signed change order. The 365-Day Done Right Promise covers workmanship; Tamko’s material warranty runs 25 to 50 years depending on the line, and we register it in the homeowner’s name at completion.

DIY or Call Us?

There’s a safe middle ground here, and then there’s the point where you need a crew. A homeowner can walk the addition roof with binoculars from the ground, check the gutter downspouts for granule accumulation, and photograph any suspicious areas for comparison year to year. What you shouldn’t do: climb a 6:12 or steeper pitch without proper fall protection, attempt to lift and reseat shingles after they’ve sealed down (you’ll crack them), or replace step flashing without removing the adjacent shingle course. The Santa Ana winds that test these roofs will test your footing too.

We carry Tamko Heritage, Titan XT, and the full accessory line on our Pomona warehouse shelves, so matching isn’t a weeks-long order. Call (626) 606-1081 and we’ll schedule a free estimate, bring color samples, and show you the photo record from a similar addition we completed near the Fairplex last quarter. Measure twice, then we can talk.

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