The Perkins Roofing learning library
Understand your roof. Make a more informed decision.
A selected reading list for homeowners: roof materials, inspections, maintenance and planning your next roofing project. Original articles, with the newest first.
24 posts · Newest first
When it comes to protecting your Florida home, consistent roof maintenance isn’t just a good idea—it’s essential. In the Sunshine State’s hot, humid, and hurricane-prone climate, your roof endures constant wear and tear
A well-maintained roof is more than just a line of defense against the elements—it’s an investment in the safety, value, and longevity of your property. In Florida, where roofs face relentless sun, high humidity, and …..
When homeowners in South Florida search for roofing companies Miami, many are exploring the long-term benefits of metal roofs. Yet, despite their growing popularity, metal roofing systems are surrounded by myths and
For homeowners in Florida, especially in hurricane-prone areas like Miami, understanding your roof’s condition is more than just a seasonal concern — it’s an investment in safety, longevity, and property value. If
Finding a reliable roofing contractor can feel overwhelming, especially when your roof is one of the most important investments in your home. In the South Florida market, with its extreme weather and unique building
When it comes to your home’s roof, choosing the best roofing material is one of the most important decisions you’ll make as a homeowner in South Florida. The right roofing material not only enhances the …..
Have you ever scheduled a roof inspection in boca only to wake up on the big day to dark clouds forming overhead? This is a common concern for homeowners in South Florida, where afternoon thunderstorms …..
Have you ever considered what professional roofers actually look for during a roof inspection? Your roof silently protects your home from harsh weather, scorching sun, and unexpected storms—but how do you know it’s
How do you know your new roof was installed correctly? A new roof costs thousands of dollars, so you want to make sure the job is done well. Knowing what to check after roofers install …..
With Miami’s unpredictable weather and harsh hurricane seasons, your roof isn’t just a part of your home—it’s your first line of defense. But when signs of damage appear, the big question arises: Do you opt …..
A roof inspection is essential for maintaining the integrity of your home, preventing costly repairs, and ensuring your roof lasts as long as possible. But how much does a roof inspection cost? The price can …..
Just like maintaining your vehicles or taking care of your teeth, regular upkeep of your Roof Maintenance is important to ensure its longevity and performance. You may find yourself asking, “How do I maintain my …..
Few aspects of your house are as important as the roof over your head. The roofing material you choose can dramatically impact the strength, energy efficiency, and general appearance of your home. But how can …..
Your roof is essential for shielding your home or commercial property from the weather. This residential roofing guide can help you whether you need a new roof, need to fix your old one, or want …..
The choice of your home’s roof is an important one that can affect its appearance and functioning. In this blog post, we’ll examine the advantages and disadvantages of three common types of roofing: metal, flat, …..
The Function, Benefits & Maintenance of Roof Gutters New homeowners often ask if roof gutters are essential in their homes or if they are just for beautification purposes. The answer is yes. Roof gutters are …..
Differences Between 5V Crimp and Standing Seam Metal Roofs 5v Crimp and standing seam metal roofs are beautiful. The right metal roof over your home will increase its aesthetic appeal while continuing to offer years …..
Standing Seam Metal Roof: Meaning, Types, Costs, Pros & Cons For as long as humans need shelter, roofing materials will remain indispensable. A popular choice in roofing, the standing seam metal roof, is a testament …..
What is a High-Velocity Hurricane Zone (HVHZ)? South Florida typically experiences severe tropical storms also known as Hurricanes. However, some areas feel the impact more. These areas are designated HVHZ
What Is TPO Roofing? Exploring Its Benefits and Suitability When pondering the question, “What is TPO roofing?”, it’s essential to understand the various facets of this roofing choice. When choosing roofing materials
How Roofing Underlayment Helps Protect Your Home Every homeowner is aware of the value of a roof underlayment and its accompanying components to the strength and aesthetics of their house. A roof shields the attic …..
How Proper Attic Insulation Helps Your Roof Attics serve as a barrier against humidity, cold and hot weather in addition to serving as storage space for things you no longer need. The importance of attic insulation for
Important Things to Consider When Replacing A Roof Roof replacement tips are crucial for the successful installation of a new roof. There are many important things to consider when it comes to replacing a roof, and if
What Should You Do When Your Roof Is Leaking Having a leaking roof is a pain for homeowners. You should be able to feel secure in your own four walls, which are designed to shield you from the elements. However,
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Build order
Six layers, in the order a crew installs them. Each one has a single job, and each one fails in its own recognisable way. This is the same assembly the animation on our home page takes apart.
The structural plywood sheathing every other layer is fastened to. During a re-roof the deck is inspected for rot and re-nailed to current Florida Building Code spacing — the single cheapest upgrade to a roof’s uplift resistance.
Required by the Florida Building Code in the High Velocity Hurricane Zone — Miami-Dade and Broward. A self-adhered membrane sealed to the deck so that if the covering is torn off in a storm, the house underneath stays dry.
The waterproofing membrane bonded to the deck. In South Florida this — not the tile or the shingle — is what actually keeps water out when a covering lifts in a squall. Skimp here and the roof leaks long before it looks worn.
Metal worked into every valley, wall junction, chimney and pipe penetration. Most roof leaks are flashing failures, not covering failures — which is why replacing flashing, rather than re-using it, is part of a real re-roof.
The visible weather surface, and the layer that takes the sun, the salt and the wind. It is the roof everyone sees — and the only layer whose failure is obvious from the street.
Ridge vents exhausting at the peak and intake at the eave, so heat and moisture leave the attic instead of cooking the deck from below. Balanced ventilation is what makes a roof’s rated lifespan its real lifespan.
Side by side
The six layers are constant. Only the product at each layer changes. Read down a column to see one complete system.
| Layer | Concrete / clay tile | Standing-seam metal | Architectural shingle |
|---|---|---|---|
| Roof deck | 19/32" plywood sheathing, re-nailed | 19/32" plywood sheathing, re-nailed | 19/32" plywood sheathing, re-nailed |
| Secondary water barrier | Self-adhered HVHZ membrane | Self-adhered HVHZ membrane | Self-adhered HVHZ membrane |
| Underlayment | Two-ply self-adhered tile underlayment | High-temperature synthetic underlayment | Synthetic underlayment |
| Flashing | Valley, wall and pan flashing | Integrated panel flashing and closures | Step, valley and vent flashing |
| Roof covering | Concrete or clay barrel tile | Standing-seam metal panel | Architectural asphalt shingle |
| Ventilation | Ridge vent with eave intake | Vented ridge cap with eave intake | Shingle-over ridge vent with eave intake |
Failure modes
Most of the leaks we repair are flashing failures, not covering failures. Water arriving at a valley, a wall junction, a chimney or a plumbing penetration is concentrated water, and the metal worked into those interruptions is what handles it. A cracked tile in an open field of tile is usually a nuisance; a corroded or reused wall flashing is a leak.
The second pattern is age reaching the underlayment before it reaches the covering. Concrete tile is effectively immune to ultraviolet light and will look serviceable for decades — but the membrane beneath it is the part with a service life, and once that membrane is brittle the roof leaks under a covering that still photographs well. This is why a tile roof is assessed by its underlayment age, not by how the tile looks.
The third is storm loss, which almost always begins at an edge or a corner where wind uplift concentrates, then peels inward. That is the case the secondary water barrier exists for: a stripped covering over a sealed deck is a repair, while a stripped covering over a bare deck is an interior loss. If a storm has just passed, start with the signs of roof storm damage .
What the code says
The secondary water barrier is the layer with the clearest statutory
history. Florida Statute 553.844 directs the Florida Building Commission to
incorporate recognized mitigation techniques for older site-built
single-family homes — expressly including Secondary water barriers for
roofs
, roof-decking attachment and roof-to-wall connection improvements
— and provides that a roof replacement must incorporate the techniques
specified. In the code itself, Florida Building Code Existing Building
Section 706.7 requires that when a roof covering on an existing structure
with a wood deck is replaced, the work include roof-decking attachment
under 706.7.1 and a secondary water barrier under 706.7.2, installed per
Section 1507.1.1 of the Building code outside the High Velocity Hurricane
Zone or Section 1518.2 inside it.
One scoping limit is worth stating because it is so often misstated in roofing marketing: Section 706.7 also says that structures permitted subject to the Florida Building Code are not required to comply with that section. The retrofit mandate is aimed at buildings permitted before the code took effect, and building departments differ in how they apply it in practice. Your building department is the authority on which regime your roof falls under.
The reason any of this exists is measurable. The Insurance Institute for Business & Home Safety defines a sealed roof deck as one where the seams between decking pieces are sealed so water cannot flow into the attic if the covering is lost, and states that an unsealed deck allows up to 60 percent of the rain falling on a compromised roof to enter the attic, while a properly installed sealed deck can reduce water entry by as much as 95 percent. That is the whole argument for the layer nobody ever sees.
Fastening is where the HVHZ diverges most visibly from the rest of Florida. Miami-Dade's own 8th Edition code material states that HVHZ asphalt shingle fastening requires in no case less than six approved roofing nails or fastening devices per shingle — four, a common minimum elsewhere, is not enough in Miami-Dade or Broward — and that intersections, eaves, rakes, valleys, gable ends and the starter course must be set in an 8-inch wide bed of approved cold adhesive or roofing cement. The same material notes that metal caps rather than plastic ones are required on the two-layer underlayment option where the ultimate design wind speed reaches 170 mph or more, which is why an HVHZ dry-in looks different from one anywhere else in the state.
Section numbers and quotations here reflect the Florida Building Code 8th Edition (2023) and the sources listed at the foot of this page. Florida amends its code on a cycle. Confirm anything you intend to rely on with your county building department or a licensed contractor.
Putting it to use
Three practical uses for knowing the assembly.
Comparing quotes
Go through the six layers and ask which product is specified at each. Deck re-nailing, underlayment type, new versus reused flashing, and the ventilation plan are the four answers that separate two quotes that otherwise look identical on price.
Judging condition
Ask how old the underlayment is, not how old the tile looks. On a tile roof the covering routinely outlives the waterproofing beneath it, and the underlayment is what determines whether you are looking at a repair or a re-roof.
Diagnosing a leak
A leak that appears near a wall, a chimney, a skylight, a valley or a vent is far more likely to be a flashing detail than a covering defect. That changes the conversation from replacement to targeted repair.
The three systems
Concrete and clay barrel tile — the South Florida signature, and the system where the underlayment beneath does most of the real work.
Standing seam with concealed fasteners and seams raised above the water line, over a high-temperature underlayment.
Architectural asphalt shingle, where nailing pattern, starter course and the sealed deck beneath decide storm performance.
Sources
Questions
The underlayment, not the covering. Tile and shingle shed the bulk of the water and take the sun, but they are made of overlapping pieces with gaps between them, and wind-driven rain gets past them routinely. The membrane bonded to the deck is the surface that is genuinely waterproof, which is why a roof can look perfect from the street and still leak.
A sealed membrane adhered directly to the roof deck so that if the covering is torn off in a storm, the deck underneath is still a closed surface rather than an open house. The Florida Building Code requires one in the High Velocity Hurricane Zone, which covers Miami-Dade and Broward counties. It is the difference between losing a roof covering and losing the interior of the building.
A full re-roof strips back to the deck, so everything above the deck is new: barrier, underlayment, flashing, covering and vents. The deck itself is inspected, repaired where it is soft or delaminated, and re-nailed. Reusing old flashing is the most common corner cut, and it is the one most likely to produce a leak on a roof that is otherwise brand new.
The six layers stay the same. What changes is the product used at each one. Tile needs a heavy self-adhered underlayment that crews can walk on and fasten through; metal needs a high-temperature underlayment because the panels run hot; shingle uses a tear-resistant synthetic sheet. Same assembly, different specification.
Ventilation is what makes a roof reach its rated lifespan instead of falling short of it. Exhaust at the ridge paired with intake at the eave lets heat and moisture leave the attic rather than cooking the deck and the underlayment from below. An unbalanced system — exhaust with no intake — moves far less air than it appears to.
Ask what happens at each of the six layers. A quote that names the underlayment product, says whether the deck will be re-nailed, states that flashings are new rather than reused, and describes the ventilation is describing a real scope. A quote that names only the covering and a price is describing one layer out of six.
Everything on this page describes roofing under the Florida Building Code, and in Miami-Dade and Broward under the High Velocity Hurricane Zone requirements that apply there. Requirements differ materially in other states and other wind zones. For what applies to a specific address, confirm with your county building department or a licensed contractor. More guides are in roof advice and across our resources.
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