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IKO Home Additions & ADU: The Miami Owner’s Guide
If your IKO home addition or ADU has a failing component, we stock and install IKO-compatible replacement parts across Miami with typical installed work ranging from $53,100 to $153,400 for a home addition and $106,200 to $259,600 for a full ADU construction. Most owners discover a problem when they notice water staining at a roofline tie-in, a settling floor at the original foundation joint, or a door that suddenly won’t latch because the connection between the addition and the main structure has shifted. We’re an independent service provider, not affiliated with IKO, which means we tell you straight what’s actually wrong and what it costs to fix, without a brand script to follow.
Here’s the thing about additions and ADUs in Miami: they live and die at the connection points. The tie-in where new framing meets old, the flashing where the addition roof dies into the existing wall, the moisture barrier at the slab edge. South Florida heat and humidity work those joints hard, and when they fail, the failure shows up small first: a hairline crack, a musty smell, a window that sticks. That’s the moment to call, before a small fix becomes a structural one.
Which IKO Models This Applies To
IKO manufactures a range of roofing and building products that get specified into home additions and ADU projects across Miami. The most common IKO materials we encounter on addition and ADU jobs are their asphalt shingle lines (Cambridge, Dynasty, Nordic), their underlayments, and their ice and water shields. If your addition or ADU was built with IKO roofing or IKO-specified sheathing products, we match the replacement part to the original spec, not just whatever is closest on the shelf.
The compatibility gotcha for IKO roofing on an addition is the shingle line and color match. IKO has changed color formulations over the years, and a shingle that looked like “Dual Black” in 2018 may not match the current production run. We keep samples of discontinued IKO colors in the shop and will match against the actual shingle, not the label on the bundle. For IKO underlayments on ADU roofs, nail pattern and overlap matter more than brand, and we spec those to the original installation method. OEM IKO parts are our default for anything still under warranty; for everything else, we’ll offer the OEM option and a quality aftermarket equivalent with the same wind and uplift ratings, then let you choose with real numbers in front of you.
To identify what you have, check the underside of a loose shingle for the IKO lot number, or look for the IKO name printed on the underlayment edge at the eave. If you can’t reach it safely, take a photo from the ground and send it over; Isaac Pruett reads job sites quickly, and sometimes he can tell you what you’ve got before he even gets on the ladder.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Water staining at the roofline tie-in. This usually means the IKO flashing or underlayment at the addition roof-to-main-wall connection has broken down under Miami sun and rain. The fix is a re-flash and re-seal, not a patch job on the ceiling below.
- A floor that dips or bounces where the addition meets the original slab. South Florida’s sandy soil settles, and a foundation joint that wasn’t pinned or keyed correctly will show movement. This is the one to catch early; it only gets more expensive as the gap widens.
- Musty odor in the ADU interior after heavy rain. That’s moisture getting behind the IKO underlayment and sitting against the sheathing. You’re smelling the first stage of rot, and it won’t dry out on its own in Miami’s humidity.
- Doors or windows that suddenly stick or won’t latch. When an addition shifts even a quarter inch, the frames rack and the hardware binds. Sometimes it’s a hinge adjustment. Sometimes it’s a sign the connection detail between old and new framing has moved.
- Granule loss collecting in gutters below the addition roofline. IKO shingles shed some granules, but a heavy, consistent buildup means the shingle surface is failing faster than it should. In Miami’s UV, that timeline shrinks compared to northern climates.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
For an IKO-compatible home addition or ADU replacement in Miami, the installed cost runs $53,100 to $153,400 depending on square footage, the condition of the existing foundation tie-in, and how much of the IKO roofing system has to come off to access the failure point. A full ADU construction runs $106,200 to $259,600. Smaller scoped repairs, like a re-flash of the roofline tie-in or targeted underlayment replacement, fall into the $4,130 to $12,980 range.
What drives the range: the size of the addition, whether we’re matching IKO roofing to existing color or replacing the whole run, the amount of structural correction at the connection point, and Miami’s permit requirements. Every price we give is a written price before any work starts, no verbal ballpark that grows on the final invoice. You’ll see the parts line by line, the labor, and the permit fees, all in one number. The work itself carries the 365-Day Done Right Promise: if anything isn’t right within a year of completion, we make it right at no cost to you, with a written guarantee stating coverage terms, exclusions, and the 365-day period plainly.
Call (850) 780-8123 for an exact quote. Estimates are free, and the number we give you is the number you’ll pay.
DIY or Call Us?
Some things you can check yourself safely. Walk the exterior and look at the roofline tie-in from the ground. Check gutters for granule buildup. Press a flat palm against interior walls near the original connection point and feel for moisture or movement. Those observations help you know what to tell us and help us get the quote right the first time.
What you shouldn’t do is get on a roof in Miami heat, pull up IKO shingles, or attempt a structural tie-in fix. Roof work in Florida sun is dangerous; a slip on steep pitch or wet underlayment puts you in the hospital. The tie-in between an addition and an existing structure involves flashing, fastening, and water management details that, done wrong, funnel water into the wall cavity for years before you see it. That’s the kind of “quick fix” we tear out of Miami homes regularly, and it always ends up costing more than calling us the first time. Tell me what you need done. I’ll tell you what it costs and when it’s finished, and I’ll mean both. You can reach us at (850) 780-8123.
FAQs
In Miami’s UV, heat, and humidity, IKO asphalt shingle products typically last 15 to 20 years, noticeably less than the 25 to 30 years you might get in drier, cooler climates. Underlayments and flashing details fail sooner, often in the 8 to 12 year range, because they take the brunt of sun and standing moisture. If your addition is past year 10 and you’re seeing symptoms, it’s time for an inspection. Call (850) 780-8123 to get one scheduled.
Most tie-in failures can be repaired if you catch them before water has rotted the surrounding framing and sheathing. A re-flash, reseal, and targeted underlayment replacement fixes the majority of cases we see in Miami. If the structural connection has moved or rotted, the repair scope grows. Either way, we’ll give you a written price before any work begins.
A roofline tie-in repair or underlayment replacement typically takes 1 to 3 working days. A larger structural correction at the foundation connection can run 1 to 2 weeks depending on permit timing in Miami. We schedule the work, pull the permits, and give you a completion date in the written quote, before you commit.
We keep IKO shingle samples, underlayment rolls, flashing stock, and the common fastener and sealant systems on the truck for Miami service calls. Discontinued IKO color matches may require a shop order, which we handle and expedite so your schedule doesn’t stall. We also stock compatible parts for KraftMaid, Cambria, and Silestone lines, which means one stop covers most of what we find on addition and ADU jobs.
Make the call and talk to a live person, any hour, any day. We’ll tell you what we’re seeing, what it costs, and when we can finish. Written price. Written guarantee. Work done right the first time. Call (850) 780-8123 to schedule your free estimate.
Written by Isaac Pruett, Owner, Mason Remodeling Co Miami at Mason Remodeling Co Miami, serving Miami and nearby areas.
