What are Miami-Dade NOAs, and why do they matter for my South Florida roofing project?

Answer: A Miami-Dade NOA (Notice of Acceptance) is the gold standard of product approval for building materials that will be exposed to High-Velocity Hurricane Zones (HVHZ). In South Florida, code requirements dictate that every component of a roofing system—from the underlayment and nails to the shingles, tiles, or metal panels—must have an active, validated NOA number demonstrating it can withstand extreme wind-uplift pressures and impacts from flying debris.

At Earl W. Johnston Roofing, LLC, we never pull standard off-the-shelf components— we want to go above and beyond building code. Every material used on your roof carries structural verification that meets or exceeds Broward and Miami-Dade County building compliance codes. When we handle your permit processing, these exact NOA documents are cross-referenced with your municipality’s building department to ensure seamless legal pass-offs during structural inspections.

What is a secondary water barrier, and is it required during a roof replacement?

Answer: A secondary water barrier (SWB) is a self-adhering underlayer applied directly to bare wood roof decking before the primary roofing material is installed. Under the current Florida Building Code, installing a secondary water barrier or sealing the roof deck joints is frequently mandatory during a full reroof.

Beyond life-safety protection, documenting the installation of an approved SWB on a Uniform Mitigation Verification Inspection form can drastically reduce your annual homeowners insurance premiums in South Florida.

How does the wind-velocity code affect shingle selection in Broward and Miami-Dade counties?

Answer: South Florida building regulations require roofing systems to be able to withstand wind velocities ranging from 140 mph to over 175 mph depending on the exact wind zone exposure category. Standard asphalt shingles frequently fail under these localized uplift pressures.

To solve this, Earl W. Johnston Roofing utilizes GAF Timberline HDZ® Shingles. Because we hold the elite designation of a GAF Master Elite, CERTAINTEED AND OWENS CORNING CONTRACTOR, we can offer the GAF WindProven™ limited wind warranty. When installed with the required combination of four qualifying GAF accessory components, these shingles feature LayerLock™ technology, which creates a mechanical bond across the nailing zone. That way,  they qualify for an industry-first wind warranty with no maximum speed limit, satisfying even the most stringent structural codes in coastal South Florida.

What is the difference between a manufacturer’s warranty and a GAF Golden Pledge® Warranty?

Answer: A standard manufacturer’s warranty typically only covers the cost of defective raw materials. If a component fails prematurely, the homeowner will be financially responsible for the labor, disposal, teardown, and permitting fees required to fix it.

Because Earl W. Johnston Roofing is a certified GAF Master Elite Contractor (a status held by less than 2% of roofers nationwide), we can provide the GAF Golden Pledge® Limited Warranty. This is the highest tier of protection available:

• Material Coverage: 50 years of 100% non-prorated coverage on shingle defects.
• Workmanship Coverage: 25 years of 100% coverage on our installation workmanship, backed completely by GAF. Even if a contractor closes their doors, the manufacturer steps in to correct any installation errors.
• Independent Inspection: GAF sends their own certified regional inspector to examine your completed roof, ensuring our work meets factory-grade benchmarks.

Concrete vs. clay tile roofing in South Florida: Which is better for longevity and thermal mass?

Answer: Both options provide exceptional protection against the subtropical elements, but they have distinct performance footprints:

• Clay Tiles: Sourced for premium estates, clay tiles offer unparalleled color retention because the natural clay is baked into the material itself. They are highly resistant to the color fading caused by intense South Florida UV exposure, stay cleaner for longer, and boast a 50-100 year lifespan. They’re also lighter than concrete, but do carry a higher initial investment, and because they’re lighter, they can be more fragile.
• Concrete Tiles: Sourced from manufacturers like Eagle Roofing Products, concrete tiles provide exceptional structural density and thermal mass, effectively slowing down heat transfer into your attic spaces. Concrete tiles are incredibly cost-effective and can be molded into various shapes, like flat shake profiles or high-S barrels. They do require a robust structural roof deck to support their weight, and have proven longevity when properly maintained.

Is an aluminum metal roof superior to steel for coastal South Florida properties?

Answer: Yes. For homes and commercial facilities located within a few miles of saltwater environments, aluminum roofing is vastly superior to galvanized or galvalume steel.

While modern steel roofs feature advanced protective coatings, microscopic clear-coat scratches or exposed edges near fasteners will eventually oxidize when exposed to salt-laden marine air, leading to structural rust. Aluminum is inherently non-ferrous, meaning it’s incapable of rusting. The heavy-gauge standing seam aluminum systems we install feature concealed fasteners, which prevent leak paths while easily deflecting wind streams up to 120–150 mph.

How do you solve the issue of standing water (“ponding”) on flat and low-slope commercial roofs?

Answer: Ponding water is legally defined as water that remains on a low-slope roof surface for longer than 48 hours after a rainfall event. If left unaddressed, ponding water accelerates UV degradation, compromises the underlying seams, and creates significant structural load risks.

At Earl W. Johnston Roofing, we correct flat roof drainage deficiencies using engineered tapered insulation systems. Our team designs custom-sloped Polyisocyanurate (Polyiso) insulation layouts that create a slight, precise pitch toward your existing drains, scuppers, or gutters. That way, even perfectly flat architectural roof lines shed water efficiently, protecting the integrity of the underlying structural deck.

What are the operational benefits of a TPO roofing system for commercial buildings?

Answer: TPO (Thermoplastic Polyolefin) single-ply roofing is one of the most efficient choices for commercial facilities in South Florida. The primary benefits include:

• Monolithic Seaming: TPO sheets are hot-air welded together at the seams. This creates a physical bond that is up to three times stronger than glued or taped systems, minimizing leaks during heavy tropical downpours.
• Extreme Reflectivity: TPO membranes are naturally bright white, boasting excellent Solar Reflectance Index (SRI) ratings. By reflecting up to 80% of solar radiation away from your facility, they dramatically reduce thermal transfer into your building, lowering commercial HVAC cooling demands and operational expenditures.

Can an elastomeric or silicone reflective coating save me from replacing my commercial flat roof?

Answer: If your underlying commercial roof insulation is completely dry and structurally sound, an advanced reflective fluid-applied restoration system can extend the life of your flat roof. 

As licensed, certified applicators of premium tropical roofing coatings, we apply seamless silicone or elastomeric membranes over existing modified bitumen, built-up, or metal roofs. These coatings cure into a completely seamless, rubberized, monolithic shield that seals minor leaks and resists standing water degradation. Because a restoration coating is categorized as a maintenance item rather than a structural capital replacement, it can often be fully depreciated in the first year for commercial tax advantages.

How does Earl W. Johnston Roofing handle HOA approvals and municipal permit filings?

Answer: We manage the entire administrative lifecycle of your roofing project. We have a dedicated office staff that compiles all technical engineering specs, commencement notices, material NOAs, and digital architectural plans required by your city building department.

Additionally, we provide homeowners with complete, organized documentation packages, including specific manufacturer color swatches and structural proof, to ensure rapid, friction-free approvals from your local Homeowners Association (HOA) board before we even get started..

What is Roof-A-Cide®, and why is it recommended over traditional high-pressure washing?

Answer: Traditional high-pressure washing uses sheer force to blast away dark mold, mildew, and Gloeocapsa magma algae from roof tiles and shingles. However, this aggressive pressure strips away the protective ceramic granules from shingles and degrades the surface sealers of concrete tiles, significantly aging the roof and leaving micro-abrasions where algae can return even faster.

Earl W. Johnston Roofing utilizes Roof-A-Cide®, an EPA-approved, non-toxic preventative chemical treatment. Applied safely at low pressure, Roof-A-Cide® targets and destroys organic growth at the cellular level without harming your landscaping or pets. A single treatment is guaranteed to keep your roof completely clean and stain-free for 2+ full years with a few exclusions, preserving the structural integrity and aesthetic value of your roofing materials.

What does a typical residential roof replacement timeline look like from tear-off to final inspection?

Answer: While exact timelines depend on material availability, HOA permits, job size, delivery timelines, and weather patterns, our highly coordinated crew workflows follow a predictable phase structure:

Project Wrap-Up: We perform an immaculate ground sweep using heavy-duty magnetic rollers to clear away dropped nails, remove all debris vectors, and coordinate with the city for the final building sign-off.

Day 1: Demolition & Dry-In: We tear off old materials down to the raw wood deck, inspect the decking for dry rot, replace damaged plywood, and install the secondary water barrier to make the home 100% watertight.

Day 2: The “Tin-Tag” Inspection: The local municipal inspector will visit the site to verify the deck nailing pattern and underlayment installation comply with regional structural safety codes.

Days 3–5: Final Material Installation: Our master craftsmen systematically install your chosen shingle, standing seam metal, or concrete/clay tiles.