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IKO Home Additions & ADU: The Jacksonville Owner’s Guide
Home additions and ADUs built with IKO roofing and sheathing products in Jacksonville typically run $45,000 to $130,000, depending on square footage, foundation work, and finish level. We stock IKO-compatible materials and handle the full build, from slab to roof, and we’re out to most Jacksonville neighborhoods within days for an assessment. Most owners call us when they spot water staining on a ceiling, shingle granule loss in the gutter, or a leak that shows up only after a hard Northeast Florida downpour, which usually points to a failed underlayment or flashing detail rather than the structure itself.
Which IKO Models This Applies To
IKO manufactures a range of asphalt shingles and underlayments that show up on home additions and ADU roofs across Jacksonville, and the compatibility question usually comes down to which product line was installed. We work with IKO’s Cambridge, Dynasty, Nordic, and Marathon lines, plus their Armourbase and StormShield underlayments. If you’re adding onto an existing structure, matching the shingle profile matters more than the color code, because IKO has shifted granule blends between production years and a 2019 Cambridge bundle won’t always sit flush against a 2024 run of the same name. The label on the original bundle wrapper or the manufacturer code on the box is the surest way to confirm what you’re dealing with, but if that’s long gone, we can pull a sample and match it against our supplier’s current stock. For additions where the roof is new, OEM IKO materials are the right call. For a repair on an older roof, a quality aftermarket equivalent rated for Florida’s wind and humidity will often outlast what’s up there now, but we present both options with a written price before any work starts.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Granule loss in the gutter or at downspout outlets. IKO shingles shed granules as they age, and in Jacksonville’s UV intensity, that process speeds up. If you’re seeing a steady accumulation of dark grit at the bottom of a downspout, the shingle’s weatherproofing layer is thinning and the mat underneath is starting to expose.
- Cupping or curling at shingle edges. Heat and humidity cycles cause the asphalt to dry and the shingle to pull upward. Once edges lift, wind-driven rain gets under the shingle and feeds rot into the decking below.
- Water staining on ceilings or at wall intersections inside the addition. This is rarely the shingle’s fault. Nine times out of ten it’s a flashing failure at a valley, sidewall, or pipe boot, especially on additions where the roofline ties into the original structure. Jacksonville’s afternoon thunderstorms attack those transitions harder than the open field of roof.
- Dark streaks or algae staining that won’t rinse off. Northeast Florida’s humidity breeds algae on asphalt shingles. It’s cosmetic at first, but the same trapped moisture that feeds the algae is also breaking down the shingle’s adhesive strip from underneath.
- Loose or missing shingles after a storm. If shingles are coming off in normal Jacksonville thunderstorm winds, the sealant strip has lost its grip. A roof that loses shingles at 40 mph is telling you it won’t hold at 75 mph when a real storm rolls through.
See the difference
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AfterReplacement Cost & What’s Included
For a home addition or ADU in Jacksonville, you’re looking at $45,000 to $130,000 for a full build with IKO roofing materials. If the issue is contained to the roof assembly only, a re-roof on an addition runs $8,000 to $20,000 depending on the roof’s pitch, the number of penetrations, and whether the existing decking needs replacement. The range for the full addition is driven by foundation type (slab versus pier), whether plumbing rough-in crosses existing sewer lines, and the finish package you choose. Every quote from us includes a written line-by-line breakdown before work starts, and the price does not move at the door. Permits, inspections, and the 365-Day Done Right Promise are all part of the job. If anything fails within the guarantee period, we come back and correct it at no charge.
DIY or Call Us?
There’s a real split here. You can safely check your gutters for granule buildup, look for lifted shingle edges from the ground with binoculars, and note any interior staining. What you shouldn’t do is get up on the addition roof and start pulling shingles. IKO shingles rely on a sealant strip and proper nailing pattern, and breaking that seal on a steep pitch in Jacksonville heat is how homeowners end up in urgent care. Walking a roof without the right shoes and the right sense of where the decking is soft will land you in the room below, and Florida attics in August aren’t a place to learn roofing on the fly. If you see the signs, call us at (904) 337-5929. We’ll give you a written assessment and a real price, not a handshake and a hope.
FAQs
IKO’s architectural lines like Cambridge and Dynasty typically last 20 to 30 years in Northeast Florida, but the real-world number in Jacksonville skews toward the low end of that range because of UV exposure, humidity, and storm cycles. A roof with proper attic ventilation and clean decking will hold longer than one where the original builder skipped either. Call (904) 337-5929 and we’ll inspect what you’ve got and give you an honest remaining-life estimate at no charge.
Yes, if the failure is isolated to a flashing point, a pipe boot, or a small section of shingles, we can repair it. If the shingles are granule-bare across large areas or the decking is soft, repair becomes throwing money at a roof that’s already done. We’ll tell you which one you’re dealing with and put the price in writing either way.
Most addition re-roofs in Jacksonville take two to four days, depending on the size of the roof, the amount of decking replacement, and whether the weather cooperates. A full home addition or ADU build runs eight to sixteen weeks from permit to final inspection. We schedule the work, pull the permits, and you get a written timeline before the first nail goes in.
We keep IKO Cambridge and Dynasty shingles plus StormShield underlayment on hand through our Jacksonville suppliers, along with IKO hip and ridge components. Specialty IKO products or a specific color match can be ordered and on site within a week. We’ll confirm material availability before we give you a start date, so there’s no surprise delay.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
