GAF Home Additions & ADU Nationwide

GAF Home Additions & ADU: The Pompano Beach Owner’s Guide

A GAF roof system on your Pompano Beach home addition or ADU typically runs $45,000-$130,000 installed, with GAF Timberline HDZ and Ultra HDZ shingles being the most common spec we see on local builds. We stock GAF-compatible ridge vents, starter strips, and underlayment for same-day repair or full re-roof integration on additions and accessory dwelling units throughout Broward County. Most Pompano Beach owners discover their GAF system needs attention when the addition’s ceiling shows water staining after a summer storm, or when the ADU’s ridge vent pulls loose in the salt-laden winds coming off the Atlantic.

Call (754) 714-6540

Which GAF Models This Applies To

GAF’s residential line breaks into three tiers relevant to Pompano Beach additions and ADUs. The Timberline HDZ, with its LayerLock technology and 130-mph wind rating, is what we specify most often for ADUs because the StrikeZone nailing area speeds installation and reduces labor cost on smaller footprints. The Timberline Ultra HDZ adds a 10% thicker shingle and the same wind rating, which we recommend for second-story additions where the roof sees more direct sun and thermal cycling. The designer lines, Camelot II and Grand Canyon, appear on higher-end detached ADUs in neighborhoods like Harbor Village.

To identify your GAF system, check the shingle bundle wrapper in storage or the GAF Smart Choice system warranty certificate from your original contractor. The model name prints on the seal strip. For ridge vent compatibility, GAF’s Cobra series, rigid or mesh, must match the shingle exposure, 5 inches for standard Timberline, 5 5/8 for Ultra. We see a common mismatch in Pompano Beach: a previous installer paired standard Cobra vent with Ultra HDZ exposure, which leaves a 5/8-inch gap at the ridge cap that admits wind-driven rain. We stock both Cobra Rigid Vent 3 and Cobra Snow Country for the handful of pitched-roof ADUs that see occasional northern exposure.

OEM GAF parts carry the Golden Pledge or System Plus warranty eligibility only when installed by a GAF Master Elite contractor. We’re independent, not GAF-affiliated, so we source GAF materials through authorized distribution and match their specs exactly, but we warranty our workmanship under our own 365-Day Done Right Promise rather than GAF’s manufacturer program. For most Pompano Beach ADU owners, the material cost difference between OEM and equivalent aftermarket underlayment, FeltBuster synthetic versus a comparably specced alternate, runs 8-12 percent. We quote both and let the owner decide.

Signs Your GAF Home Additions & ADU Is Failing

• Water stains on the addition ceiling after storms. In Pompano Beach, this usually traces to lifted ridge vents or compromised step flashing where the addition ties into the existing roof. The salt air accelerates corrosion on non-GAF-compatible fasteners that a previous installer may have used.
• Granule loss visible in gutters or downspout outlets. GAF shingles shedding granules at year 8-10 in Florida is premature, often caused by inadequate attic ventilation in the ADU’s smaller roof volume. The trapped heat cooks the asphalt binder.
• Shingle tabs curling or clawing upward. This happens when the addition’s roof deck was installed over conditioned space without proper vapor barrier, or when the GAF starter strip was omitted at the eave. The moisture gradient warps the shingle from below.
• Daylight visible through the ridge vent from inside the ADU attic. The Cobra vent’s end plugs or union connectors have separated, typically from thermal expansion in unventilated attic peaks that reach 140 degrees in July.
• Flashing gaps at the addition-to-house junction. Pompano Beach’s seasonal expansion and contraction, 40-degree winter mornings to 95-degree summer afternoons, works caulk and step flashing loose within five years if not back-seamed with GAF WeatherWatch leak barrier.

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Replacement Cost & What’s Included

For a full GAF roof system on a Pompano Beach home addition or ADU, our installed range is $45,000-$130,000. An ADU at 600-800 square feet with simple gable geometry and walkable pitch typically lands in the lower third; a two-story addition with multiple valleys, chimney cricket, and designer shingle spec pushes toward the upper end.

What drives the spread: deck condition after tear-off, whether the original addition was flashed to code, and access. Tight lots in Old Pompano or the Cove limit dumpster placement and add labor hours. Every quote we deliver is a flat written price with line-item scope, including the photo documentation we shoot before, during, and after. Under Clause 1 of the Haven Standard, that price is fixed. No change order, no change in cost. Our 365-Day Done Right Promise covers the workmanship; GAF material defects fall to their standard warranty terms.

DIY or Call Us?

There’s a short list an owner can safely check. Verify your gutter downspouts aren’t backing up and saturating the eave. Confirm attic vents aren’t blocked by stored items. Photograph any ceiling stain for our review, with a quarter in frame for scale.

Everything else on a GAF roof system carries real risk. The ridge vent sits at height, on a slope, often above a 12-foot ADU wall with no interior access. Step flashing removal disturbs the existing roof-to-wall seal; done wrong, it channels water into the wall cavity. And the tear-off phase on any Florida roof built before 2004 may uncover asbestos-containing felt or lead flashing that requires certified abatement. We don’t dramatize this, but we don’t minimize it either. Our crews carry the documentation, the harnesses, and the workers’ comp coverage. Call (754) 714-6540 and we’ll schedule a free estimate with a written price before any work starts.

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