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CertainTeed Home Additions & ADU: The Miami Owner’s Guide
A CertainTeed home addition or ADU project in Miami typically runs $53,100 – $153,400 installed, and Mason Remodeling Co Miami delivers a written price before any work starts. Most owners call us when their existing addition shows water intrusion at roof-wall intersections, failing window flashing, or drywall cracking that signals foundation movement in South Florida’s shifting soil. If you’ve got a CertainTeed product that’s underperforming or an addition that’s leaking, we stock the compatible materials and can usually schedule an assessment within days, not weeks.
Which CertainTeed Models This Applies To
CertainTeed doesn’t manufacture “home additions” as a single SKU. What you’re really dealing with is a system: CertainTeed roofing shingles, siding, insulation, and drywall working together across the addition’s envelope. The compatibility gotcha most Miami homeowners miss is that CertainTeed’s Landmark shingle line requires specific underlayment and flashing details to maintain the manufacturer’s warranty. If a previous contractor paired Landmark PRO shingles with a generic underlayment or skipped the CertainTeed WinterGuard at eave lines, your roof system isn’t warrantied, and South Florida’s afternoon downpours will find those gaps within three to five years.
For siding, CertainTeed’s Cedar Impressions and Board & Batten lines use different starter strips and J-channels. Mixing them means seams that open up during Miami’s humidity swings. We identify what you have by pulling a piece and checking the profile, not just reading the faded brand stamp. For aftermarket equivalents: we use CertainTeed OEM where warranty matters (roofing, flashing, soffit), and we’ll recommend higher-performing aftermarket only where the spec allows it (certain interior drywall and insulation applications). We’re an independent contractor, not a CertainTeed dealer, which means we’re not obligated to push one product line when something else makes more sense for your house.
Styles & brands we work with
Signs Your CertainTeed Home Addition Is Failing
- Water staining at ceiling-wall corners. Almost always a flashing failure where the addition roof ties into the original house. CertainTeed shingles rarely fail first; the transition detail does. In Coconut Grove and Coral Gables homes we see this after five to seven years when the original addition was built without proper step flashing.
- Drywall cracks that open and close seasonally. South Florida’s wet-dry cycle expands and contracts the soil under your slab. A hairline crack that widens after heavy rain is settlement, not a bad tape job. If the crack exceeds 1/8 inch, the addition’s foundation may need attention before any cosmetic work.
- Windows that stick or won’t latch. The addition’s frame has moved. This is structural, not hardware. Forcing the window compounds the problem and misaligns the sash permanently.
- Mold smell in one specific room after rain. Water is getting behind the CertainTeed siding or through the roof deck. By the time you smell it, the insulation is already saturated. CertainTeed’s fiberglass insulation loses R-value permanently once wet, so it needs replacement, not drying out.
- AC runs constantly but the addition never cools. The insulation batts were installed with gaps or compressed in the walls. CertainTeed insulation performs to spec only when installed at full loft. We find this in roughly four out of ten additions we assess in Miami’s older neighborhoods.
See the difference
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After
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AfterReplacement Cost & What’s Included
Here’s what we charge in Miami, in real numbers, so you can self-qualify before calling:
- Full home addition (400 – 800 sq ft): $53,100 – $153,400
- Addition roof replacement with CertainTeed Landmark shingles: $9,440 – $23,600
- Window replacement in a failing addition: $5,310 – $17,700
- Insulation removal and replacement: $2,360 – $7,670 depending on square footage and access
- Structural repair (foundation, framing correction, flashing): quoted after assessment, typically $3,500 – $15,000
Every quote includes the parts, labor, debris removal, and the written guarantee. The 365-Day Done Right Promise applies: if something we touched fails within a year of completion, we return and fix it at no charge. No dispute process, no conditions. Isaac Pruett reads the job site, gives you one number, and that number doesn’t move. “Tell me what you need done. I’ll tell you what it costs and when it’s finished – and I’ll mean both.”
DIY or Call Us?
You can safely inspect visible flashing, check for cracked caulk around windows, and look at the soffit for water staining. You can also check whether the CertainTeed shingle granules are collecting in your gutters, which tells us the shingles are near end of life. What you should not do is get on the addition roof, especially a steep pitch in Miami’s summer heat. Falls from single-story roofs are the most common serious injury we hear about from homeowners who tried to fix flashing themselves.
Replacing flashing, correcting a structural framing issue, or redoing a roof tie-in are not DIY jobs. They need a licensed crew that understands how CertainTeed’s warranty details work with Miami’s wind and rain code. We pull permits, we pass inspections, and we stand behind the work. Call (850) 780-8123 and we’ll send someone who can tell you what’s actually wrong, not what’s easiest to sell.
FAQs
A properly built CertainTeed addition with Landmark shingles, correct flashing, and full-loft insulation should last 25 – 30 years before major work in Miami, though the roof typically gets replaced at 15 – 20 years due to UV and storm wear. Call (850) 780-8123 to have us assess yours.
Yes, when the failure is isolated. A single flashing seam, one window, or a section of water-damaged drywall can be repaired without touching the rest of the addition. We repair when it’s honest to; we replace when the underlying system is compromised and patching would fail within two rainy seasons. Call (850) 780-8123 for an exact assessment and written quote.
Most repairs like flashing, window replacement, or insulation take one to three working days. Full addition rebuilds run twelve to twenty weeks depending on scope and permitting. We’ll give you a schedule in writing before work starts, and Isaac Pruett finishes within the schedule he quoted. Call (850) 780-8123 to get started.
We stock the common CertainTeed-compatible materials on our trucks: flashing, underlayment, starter strips, and a range of Landmark shingle colors, plus KraftMaid, Cambria, and Silestone products for interior elements. Specialty items like Cedar Impressions siding in less-common colors are ordered for your specific job and arrive within a week in Miami. Call (850) 780-8123 and we’ll confirm what’s on the truck and what needs ordering.
No. We provide a written price before any work begins on every project, every time. No surprise invoices, no verbal estimates that grow. Call (850) 780-8123 for your free estimate and see the number in writing.
Written by Isaac Pruett, Owner, Mason Remodeling Co Miami at Mason Remodeling Co Miami, serving Miami and nearby areas.
