Every roof tells a story about the home it protects and the climate it faces. In Phoenix and across the Southwest, heat, sun, seasonal downpours, and the occasional wind event put roofing materials through their paces. Choosing between metal and asphalt shingles is not just a style decision. It affects home comfort, long‑term costs, insurance, and resale value. After years on ladders and in attics through triple‑digit days, here is how we look at the choice.
What matters most in the desert
The Valley’s roofing priorities differ from the Midwest or the Pacific Northwest. We deal with UV intensity that breaks down materials faster, thermal shock as surfaces swing from 160 degrees in the afternoon to the 80s after sunset, dust that creeps into every seam, and monsoon cells that can dump an inch of rain in an hour with gusty outflow winds. A good roof in Phoenix carries reflective capability, solid fastening against uplift, and enough resiliency to survive thermal movement without cracking.
Both metal and asphalt can perform well here, but the trade‑offs are real. People often focus on the first price quote. The smarter way is to evaluate lifespan, energy performance, maintenance, noise, fire resistance, and how each material interacts with your home’s structure and ventilation.
Life expectancy in real terms
Manufacturers like to publish optimistic ranges. Field conditions tell the truth.
Asphalt architectural shingles in metro Phoenix typically last 15 to 22 years. The better laminated products with high-definition granules and a proper underlayment can push toward the top of that range. The roof’s orientation matters. South and west slopes cook harder, so those faces often age out a few years early. If we can’t get proper attic ventilation or if the shingles were stapled rather than nailed, expect accelerated wear.
Metal roofing covers a wide spectrum. Painted steel standing seam with a Kynar 500 finish commonly exceeds 40 years before the finish dulls. Galvalume panels, properly detailed, can run 30 to 45 years. Aluminum standing seam outlasts steel in coastal environments due to salt, but here in Arizona steel performs quite well. The fastener approach matters. Exposed fastener systems rely on neoprene washers that age and eventually leak unless you keep up with maintenance. Concealed fastener standing seam avoids that issue and tends to deliver the longest service life.
If you plan to stay in your home beyond one asphalt cycle, metal’s longevity starts to pencil out.
Heat, reflectance, and your utility bill
A roof in the Valley is a solar collector whether you want it to be or not. Two properties drive performance: solar reflectance, which measures how much sunlight the surface bounces away, and thermal emittance, which measures how well it releases absorbed heat.
Modern “cool roof” metals use reflective pigments in the paint system. A light‑colored Kynar finish can reflect 50 to 65 percent of solar energy. Even some darker finishes now reach the mid‑30s to low‑40s through specialized pigments. Metal also sheds heat quickly at night, which helps reduce stored heat radiating into the attic after sundown.
Asphalt shingles rely on granules to protect the asphalt from UV. Standard dark shingles generally reflect 10 to 20 percent. Cool‑rated shingles with specialty granules can reach the high 20s or low 30s in light colors. They work, but the performance edge still goes to metal in identical colors.
In practice, homes that move from a dark asphalt roof to a light, cool‑rated metal roof often see summer cooling reductions in the 10 to 20 percent range. Attic temperatures can drop by 15 to 30 degrees when the whole system is designed right, including adequate intake and exhaust vents. If you keep the roof color similar and only change materials, the energy savings gap narrows but does not disappear.
Wind, rain, and monsoon dynamics
Outflow winds ahead of a monsoon gust front can arrive suddenly. We see ridge caps get peeled and shingles lifted if the nailing pattern is weak or the seal strips never fully bonded due to dust during installation. Asphalt shingles with a 130 mph rating hold up well when installed with six proper nails per shingle and a clean, warm day that lets the seal activate. We avoid installing shingles when dust is high or temperatures are too low to bond.
Standing seam metal performs admirably in gusty conditions as long as clips and seams are specified for local wind speeds and properly fastened into the deck or purlins. The weak point is rarely the seam itself, but the transitions: eaves, rakes, ridge, and penetrations. We spend extra time on edge metal and underlayment detailing because that is where wind tries to get underneath.
Heavy, short‑burst rains expose underlayment quality. Synthetic high‑temperature underlayments paired with either system create a robust secondary barrier. We no longer use low‑grade felt in the Valley except on temporary dry‑ins. For low slopes at the edge of the shingle range, we may step up to a self‑adhered membrane in critical areas like valleys and eaves, then tie into the main underlayment field. Metal lets us safely roof lower slopes without the same leak risk because the panels are continuous and seamed, but every roof has minimums. We do not push shingles below their rated slope and expect trouble to stay away.
Noise, hail, and real‑life comfort
Metal has a reputation for being loud in the rain. On open framing with no deck and no insulation, it is. On a typical Phoenix home with a solid deck plus underlayment and drywall ceilings with blown or batt insulation, the difference from asphalt is modest. If someone is replacing a roof on a detached patio cover with open rafters, we often add a sound‑deadening layer or a rigid insulation board under the metal to keep the pinging down during a storm.
Hail is less frequent here than in the Plains, but we do get pea to marble‑size stones in some cells. Thick architectural shingles can self‑heal slightly in the heat, but they can also lose granules and bruise. Metal will often dent, especially softer aluminum, but dents are usually cosmetic. Steel with a heavier gauge resists denting better. Insurance carriers treat hail differently by state and policy, but in general, Class 4 impact‑rated shingles and some metal assemblies can earn premium credits. Always check with your carrier before you bank on savings.
Fire, embers, and rooftop safety
Both high‑quality asphalt shingles and metal roofing can achieve Class A fire ratings when installed over appropriate underlayments. Metal has an edge in ember resistance because there is no exposed asphalt or granules to ignite, and panels shed embers readily. In areas near wildland interfaces, we often recommend metal or Class A shingle assemblies with non‑combustible soffits and metal gutter guards to prevent debris buildup.
For rooftop foot traffic, metal panels demand a specific step pattern to avoid oil canning or denting pans. An asphalt roof tolerates foot traffic a bit better, especially in cool hours, but on a 115‑degree day the asphalt softens, and scuffing is easy. We schedule inspections early morning during heat waves to protect the roof and our crews.
Weight and structure
Asphalt shingles weigh about 2.5 to 3.5 pounds per square foot depending on the product. Steel standing seam often comes in around 1 to 1.5 pounds per square foot. That means a metal roof is lighter, which can be beneficial on older trusses or where we are overlaying on top of an existing single layer after verifying code compliance and deck condition. We still inspect the deck thoroughly, replace rotten sections, and confirm fastener pull‑out values before we consider an overlay. Tile tear‑off conversions to metal often net a meaningful structural margin because concrete tile can weigh 9 to 12 pounds per square foot.
Ventilation and attic health
Heat kills roofs and raises energy bills. Proper ventilation removes superheated air and moisture from the attic. Asphalt shingles require balanced intake and exhaust to keep the underside of the deck cooler, protect the shingles, and prevent mold. Metal benefits equally, but it also offers design options. With a standing seam system, we can integrate continuous ridge vents and even add a ventilated cold roof assembly, creating an air space between the deck and panels that reduces heat transfer further.
We also watch for bathroom and kitchen vents that dump into attics, which is common in older homes. Moisture from those ducts shortens the life of any roof. Part of every re‑roof we do is correcting those terminations to the exterior. An optimally vented attic can extend shingle life several years and improve metal performance in shoulder seasons when air conditioning load is lower.
Underlayments and details that decide outcomes
A roof fails at the small places: penetrations, skylights, walls, chimneys, and transitions. Flashing quality often matters more than the top material. On asphalt, step flashing at sidewalls, kickout flashing to direct water into the gutter, and properly woven or cut valleys separate good roofs from callbacks. On metal, we form custom flashings at penetrations rather than relying on generic boots when possible, and we specify closers and sealants rated for high temperatures.
Underlayment choice is a quiet hero in the Southwest. We prefer high‑temp synthetics under metal and shingles because asphalt‑based felt can slump or bond under heat, especially under metal. In critical leak zones like valleys, around chimneys, and at eaves, we install a self‑adhered membrane that seals around nails. That detail often decides whether a freak wind‑driven rain turns into water staining on your ceiling.
Cost reality, not brochure math
Typical installed costs vary with roof complexity, height, and access. Architectural asphalt shingles usually represent the lower upfront cost. In the Phoenix area, many straightforward asphalt installs land in a range that makes sense for first‑time buyers and rental properties. Premium shingles, upgraded underlayments, and extensive decking repairs raise that number, but it remains the budget‑friendly path.
Standing seam metal carries a higher first cost. Custom fabrication, more precise detailing, and more labor per square foot push the price up. Exposed fastener metal panels are cheaper, but Mountain Roofers in hot climates the washer maintenance makes https://www.facebook.com/profile.php?id=61555208022725 them less attractive on primary residences. When we run lifecycle comparisons, a homeowner who plans to stay 25 years often finds metal’s longer service life and potential energy savings narrow the gap or even reverse it. If you expect to sell within 8 to 12 years, the decision hinges more on curb appeal, neighborhood norms, and whether the buyer pool values metal in your area.
Solar compatibility
Phoenix is solar country. Both materials can host photovoltaic systems, but the mounting approach differs.
Asphalt roofs take rail‑based or rail‑less racking that penetrates the deck. We flash each standoff with purpose‑built flashing. The system works well, though every hole is a potential future maintenance point. If the asphalt roof is midway through its life, we often recommend reroofing under the array to avoid tearing everything down in five or six years.
Standing seam metal shines for solar because we can clamp to the seams without penetrating the panels. That eliminates dozens of holes and makes panel removal for service simpler. The roof will typically outlast the solar array, which makes the long‑term maintenance picture cleaner.
Aesthetics and neighborhood fit
Asphalt shingles have come a long way in profile and color. Dimensional shingles offer shadow lines that mimic wood shakes without the fire risk. They blend naturally in most subdivisions and HOA communities. Cool‑rated light colors are available, though darker palettes still dominate.
Metal roofs telegraph a more contemporary or agrarian feel depending on the profile. Standing seam with 16‑ to 18‑inch pans looks crisp and modern. Corrugated profiles read more rustic. Color ranges are broad, from desert sand to deep bronze. In some neighborhoods, metal adds distinctive value. In others, an HOA may require shingle or tile. We review CC&Rs with clients before any commitment so style does not end up in conflict with community rules.
Maintenance across the years
Every roof benefits from seasonal attention. Dust storms fill gutters, and debris piles up in valleys behind chimneys. On an asphalt roof, we check for lifted shingles, exposed nails, cracked pipe boots, and granule loss near downspouts where water scours. On a metal roof, we inspect panel seams, closures at ridges, movement at penetrations, and the condition of any exposed fasteners on accessories. With exposed fastener metal, plan for periodic re‑tightening or washer replacement in the 12‑ to 15‑year window.
Avoid pressure washing both materials. It strips granules from shingles and can drive water under metal laps. Gentle rinsing and hand clearing of debris serve better. Roof coatings are sometimes marketed as a cure‑all for aging shingles. We rarely recommend coating shingles; it can void warranties and trap heat. Metal coatings have a place on certain commercial profiles but are not a substitute for a worn‑out system.
Warranty language, interpreted
Manufacturer warranties often sound generous. The details matter. Asphalt “lifetime” usually covers manufacturing defects, not wear from sun or hail. Prorating begins after a short non‑prorated window, and labor coverage is limited. Upgraded warranties that include labor typically require certified installers and specific underlayments.
Metal warranties split between the paint finish and the substrate. A 35‑ to 40‑year finish warranty protects against chalking and fading within defined limits. Substrate warranties guard against perforation due to corrosion under normal conditions. Neither warranty covers storm damage or poor installation. The installer’s workmanship warranty becomes crucial. We stand behind our work because most real‑world issues tie back to detailing, not the panel or shingle itself.
When asphalt makes the most sense
Asphalt excels for homeowners prioritizing lower upfront cost with solid performance, especially on steep, simple roofs. If you plan to move within a decade, a high‑quality architectural shingle with proper ventilation and synthetic underlayment is a practical choice. Asphalt also fits well under stricter HOAs that specify a particular look, and on complex hips and valleys where shingle detailing can be more economical without sacrificing quality.
When metal is the better answer
Metal rises to the top when you value longevity, energy efficiency, and minimal penetrations for solar. It is ideal on lower slopes that push the limit for shingles and on open‑beam or vaulted ceilings where keeping heat out is critical. If your property borders wildland areas or you want a distinctive modern profile, metal hits both performance and design goals. For those who dislike roof replacements, a properly installed standing seam system can be the last roof you buy.
A homeowner’s field checklist for deciding
- Expected time in the home: less than 10 years, 10 to 20, or 20 plus Roof design: low slope areas, many penetrations, or simple gables Sun exposure: large south or west faces that bake daily Solar plans: adding PV now or within the next five years HOA and neighborhood standards: any restrictions on profiles or colors
Bring this list to your estimate meeting. The best system emerges when we match these factors to your budget and maintenance preferences.
What a proper install looks like
On asphalt, we start by removing the old roof down to clean decking. We replace soft or delaminated OSB and confirm nail hold. A high‑temp synthetic underlayment goes on, with self‑adhered membrane in valleys and at eaves. We install new metal drip edge, ice and water around penetrations, and then shingles with six nails per shingle in the manufacturer’s pattern. We cut a continuous ridge vent if the attic design allows, balance soffit intake, and cap with matching high‑profile ridge. Every penetration gets new flashing, not reused parts.
On standing seam metal, precision rules. Panels are measured, fabricated, and staged to avoid oil canning. We use high‑temperature synthetic underlayment, add a slip sheet where needed, and install continuous eave and rake metal. Clips and fasteners meet engineered spacing for wind. We hem panels properly at eaves rather than relying solely on sealant. Closures at ridge and hips block wind‑driven rain, and custom‑bent flashings at skylights and pipes create a clean, watertight finish. If solar is planned, we coordinate seam layout with the solar contractor to optimize clamp points and wire paths.
Realistic budgets and phasing
Some clients phase the project to manage cost. If you choose asphalt now with the intent to go metal later, keep a few things in mind. Invest in the decking repairs and ventilation now. Those upgrades carry forward. Choose a synthetic underlayment rated for heat because it will protect the deck longer if timelines shift. If you plan to add solar on shingles, place arrays where you can reroof sections around them later without a full tear‑down. We often map this out with aerial imagery and a simple CAD layout, saving headaches years down the road.
The Mountain Roofers perspective
We have torn off roofs that died early because corners were cut on ventilation or flashing. We have also inspected 18‑year‑old asphalt roofs that still had honest years left thanks to careful detailing, a light color, and a clean attic. Metal jobs we installed 15 years ago continue to look new, even after dust storms and August heat. There is no one right answer for every home. There is a right answer for your home, budget, and plans.
If you want a straight, numbers‑driven comparison for your roof, we are happy to measure, model attic temperatures, and provide line‑item options. The best choice gets easier when you see how the pieces fit: climate, structure, energy, and maintenance.
Contact Mountain Roofers
Contact Us
Mountain Roofers
Address: Phoenix, AZ, United States
Phone: (619) 694-7275
Website: https://mtnroofers.com/
Call for a site visit, and we will walk the roof with you. Expect candor about what fits and what does not. We will bring color chips, profile samples, and an infrared thermometer so you can feel the difference on a hot day. When you see that contrast in your own attic, the decision tends to make itself.