IKO Home Additions & ADU Nationwide

IKO Home Additions & ADU: The Boca Raton Owner’s Guide

IKO home additions and ADU construction in Boca Raton typically runs $45,000-$130,000 for standard additions and $90,000-$220,000 for detached ADUs, with Rowan Construction Group stocking compatible IKO roofing and waterproofing systems for these projects. We deliver a written, line-item price before any work begins, and most IKO material assessments are completed same-day. Homeowners usually discover an IKO component issue when their addition’s roof shows granule loss after a Boca Raton storm season, when the ADU’s Cambridge or Dynasty shingles no longer shed water properly, or when a permit inspector flags the underlayment spec against Florida’s HVHZ (High Velocity Hurricane Zone) requirements.

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Which IKO Models This Applies To

IKO’s residential roofing systems used in Boca Raton additions and ADUs fall into three main series: Cambridge Architectural, Dynasty with ArmourZone, and Marathon Plus 3-tab. The Cambridge line carries a 130 mph wind warranty when installed with the manufacturer’s prescribed six-nail pattern, which is non-negotiable in Palm Beach County’s HVHZ. Dynasty shingles use a fiberglass mat that differs from Cambridge’s organic base, and the ArmourZone strip is a factory-applied sealant band that activates at lower temperatures, critical for winter installs in Boca Raton’s mild season.

To identify your IKO system, check the cellophane strip on shingle bundles for the series name and lot number, or look for the printed nail line on installed shingles. The OEM part number matters because IKO’s FastLock sealant formulation changed in 2019, and mixing pre- and post-2019 shingles on the same plane voids the wind warranty. We source IKO factory-authorized materials through certified distributors; for discontinued lines, we match to IKO’s current spec rather than substituting an unvetted aftermarket equivalent. Rowan Construction Group Boca Raton is an independent contractor, not affiliated with IKO.

Signs Your IKO Home Additions & ADU Is Failing

• Granule accumulation in gutters or downspout exits. IKO Cambridge and Dynasty shingles shed ceramic granules as the asphalt binder oxidizes; in Boca Raton’s UV exposure, this accelerates after year 12-15. Heavy granule loss exposes the fiberglass mat, and the shingle loses its Class A fire rating and impact resistance.
• Curling or clawing at shingle edges, especially on south- and west-facing planes. This indicates the shingle’s thermal cycling has exceeded its design range. Boca Raton’s afternoon roof temperatures reach 160°F in July; without adequate attic ventilation specified in the IKO installation manual, the mat expands and contracts beyond tolerance.
• Lifted tabs or entire shingles after storms below hurricane force. IKO’s sealant strip failed to activate fully, often from installation in temperatures below 45°F or from dust contamination during storage. In HVHZ zones, this is a code compliance issue, not merely cosmetic.
• Water staining on addition ceiling drywall or ADU soffit panels. The IKO synthetic underlayment (GoldShield or StormShield, depending on vintage) may have been improperly lapped at valleys or penetrations. GoldShield requires a 4-inch side lap; StormShield requires heat-welding at low-slope transitions.
• Moss or algae streaking concentrated on the north slope. IKO’s algae-resistant granules use copper-coated ceramic; when these wear, Florida’s humidity allows Gloeocapsa magma colonization. This retains moisture and accelerates substrate rot in the addition’s roof deck.

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Replacement Cost & What’s Included

IKO roofing system replacement for a Boca Raton home addition or ADU ranges from $45,000-$130,000 for the full addition structure, or $8,000-$20,000 for roof-only replacement on an existing addition. ADU construction with IKO roofing as specified runs $90,000-$220,000. The spread reflects: square footage of roof plane, whether the existing deck is plywood or OSB and its condition, HVHZ fastening requirements (six nails per shingle, ring-shank fasteners), and whether we replace IKO underlayment to current GoldShield spec.

Every quote is a flat price with written scope. Under Clause 1 of The Haven Standard, that price is delivered before anyone picks up a tool. The scope specifies: IKO shingle series, underlayment type, drip edge gauge, valley metal, and ventilation calculation per FHA 1/150 rule. Our 365-Day Done Right Promise covers the installation; IKO’s limited warranty covers manufacturing defects with proper documentation, which we file on your behalf. No change proceeds without a signed change order, which is why our projects finish within a few percent of the agreed number.

DIY or Call Us?

An owner can safely check: gutter granule volume after rain, visible shingle tab lift from ground level with binoculars, and attic ventilation intake/exhaust balance (soffit vents should not be blocked by insulation). Photograph what you find; our documented photo record will compare against your observations.

DIY goes wrong at the roof plane. HVHZ fastening patterns require specific nail placement and penetration depth into roof sheathing; Palm Beach County inspectors reject jobs with overdriven or misplaced fasteners. More critically, working at height on a pitched surface with Boca Raton’s afternoon heat and sudden storms creates genuine fall risk. We do not recommend homeowner roof access. Call (754) 254-8065 to schedule your free estimate; we’ll assess the IKO system from the surface and attic, deliver a written price, and schedule only when you’re ready.

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