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Tamko Home Additions & ADU: The Orlando Owner’s Guide
If you’re planning a home addition or ADU in Orlando and want Tamko roofing and waterproofing products specified into the build, we can source and install Tamko-compatible materials as part of a full addition project. A complete home addition in Orlando typically runs $45,000 – $130,000, while a detached ADU lands between $90,000 and $220,000 depending on square footage, foundation work, and finish level. Most homeowners call us after discovering that a previous addition was built with mismatched or underspecified roofing underlayment, flashing details, or moisture barrier products, and now water is finding its way into places it shouldn’t.
We’re an independent Orlando remodeling contractor, not affiliated with Tamko directly. What we do is specify, source, and install Tamko roofing, underlayment, and waterproofing products correctly as part of the larger addition or ADU build, so the whole assembly works together instead of fighting itself.
Which Tamko Products This Applies To
Tamko makes a broad line of residential roofing and waterproofing products, and the compatibility question depends entirely on which product your addition or ADU calls for. The main lines we specify on Orlando additions include Tamko Heritage shingles, TW-60 and TW-90 underlayments, and Tamko moisture barriers used at foundation and sill transitions. Here’s the gotcha most homeowners miss: Tamko shingle color and profile must be matched to the existing roof if the addition ties into the main house roofline, and Florida code requires specific underlayment ratings for our wind and rain loads. Mixing a Tamko shingle with an off-brand synthetic underlayment is where we see premature failures in Orlando, especially on low-slope addition roofs where ponding water sits after a summer downpour.
For ADUs, the product selection shifts toward Tamko’s self-adhered membrane products at the foundation wall and window flashing details. These are not interchangeable with basic felt. If you’re unsure what was used on your existing structure, we check the label on the shingle bundle or the underlayment edge, and we can usually identify the exact product line within a phone call and a few photos.
Styles & brands we work with
Signs Your Home Addition or ADU Roofing/Waterproofing Is Failing
- Water staining on interior ceilings or walls near the addition seam. This almost always traces back to improper flashing where the new roofline ties into the original structure. The seam is the weak point, and Orlando’s afternoon thunderstorms test it daily in the summer.
- Shingle granules collecting in gutters or at downspout outlets. Tamko shingles shed granules as they age, but excessive granule loss within the first few years signals a ventilation problem in the addition attic or a manufacturing defect worth documenting.
- Musty odor inside the ADU after rain. That smell means moisture is getting behind the wall assembly. In Florida humidity, once it’s inside, mold follows quickly. The culprit is usually window flashing or a foundation-to-wall transition that wasn’t sealed with the right Tamko membrane.
- Peeling tape or lifting edges at underlayment visible in the attic. If you can see the underlayment from the attic side and the seams are separating, water has a direct path to the decking.
- Visible sagging or soft spots on the addition roof deck. By the time you feel the roof give when walking it, the decking is compromised. We’ve replaced more rotted decking on poorly flashed Orlando additions than we have on original builds, and it’s always the same story: the original installer skipped the peel-and-stick membrane at the valley or the wall transition.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a full home addition in Orlando, budget $45,000 – $130,000. An ADU runs $90,000 – $220,000. Those are real ranges we’ve seen hold up across College Park, Baldwin Park, and the Dr. Phillips area. What drives the number: foundation type (slab vs. pier), whether the addition ties into the main roofline or stands separate, the Tamko product line you specify, and the finish level inside the new space.
If your existing addition or ADU has a failed roof or waterproofing assembly and you’re replacing just that scope rather than building new, a targeted re-roof of an addition runs $8,000 – $20,000 depending on square footage and how much decking needs replacement. Our written price includes all Tamko materials, removal and disposal of the failed product, decking repair as needed, and labor. You get the number before we start, and the 365-Day Done Right Promise covers the work in writing. If something fails inside that year, we come back and fix it at no charge.
Call (850) 427-6454 for a written line-item estimate. We don’t do verbal ballparks.
DIY or Call Us?
You can safely do a visual inspection: walk the perimeter after a hard rain, look for water staining at the seam where the addition meets the original house, check gutters for granule buildup, and look in the attic for daylight coming through the decking. That’s where your involvement should end. Working on a roof in Orlando means working at height, and working with self-adhered membranes and shingle fastening requires knowing what the Florida Building Code requires for wind uplift ratings. Trevor Nash grew up in Los Angeles and learned the fundamentals at Los Angeles Trade-Technical College, and even after nearly two decades swinging a hammer, he still doesn’t recommend that a homeowner climb onto an addition roof with a nail gun. The risk isn’t worth the savings. Give you the number first, then pick up the tool. Call (850) 427-6454 and we’ll come look at it.
FAQs
Tamko’s architectural shingle lines are rated for roughly 30 years under normal conditions, but Orlando’s UV exposure, summer heat, and storm cycles mean we realistically see 18 – 25 years before meaningful wear shows on the Florida sun-facing slopes. Underlayment typically outlives the shingles if installed correctly, but it fails early when seams aren’t sealed. Call (850) 427-6454 if you want us to assess what’s on your addition now, estimates are free.
Yes, if the failure is localized, like a single valley flashing seam or a wall transition that’s lifting. We can strip the affected area, replace the Tamko membrane or flashing detail, and re-shingle the patch. If the underlayment failure is widespread or the decking is already compromised, a partial repair just postpones the full replacement and costs more in the long run. Call (850) 427-6454 and we’ll tell you which situation you’re in after one inspection.
A straightforward room addition typically takes 3 – 5 months from permit to final inspection. A detached ADU runs 5 – 8 months depending on foundation work, utility runs, and the finish package. We give you a written schedule window before we start, and if the 365-Day Done Right Promise applies to the work, that’s in writing too. Call (850) 427-6454 for a timeline specific to your project.
We order Tamko shingles, underlayments, and membranes directly for each project, which means we get the exact product line and color match your addition or ADU needs without relying on whatever happens to be on a shelf. For common profiles like Heritage in weathered wood or charcoal, lead time is usually under a week. Call (850) 427-6454 and we’ll confirm availability for your specific product.
If you’re planning a home addition or ADU in Orlando and want Tamko products specified correctly, or if you’re looking at a failed addition roof and need an honest assessment, call (850) 427-6454. We’ll give you a written number before you commit to anything.
Written by Trevor Nash, Owner, Penhallow Remodeling Orlando at Penhallow Remodeling Orlando, serving Orlando and nearby areas.
