Fact-checking metal roofing
Most fears about metal roofs come from barns and sheds, not from a metal roof built over a solid deck on a house. Here are nine common myths, checked one at a time: what holds up, what does not, and where the answer comes from.
We install metal roofs in Dallas-Fort Worth, so we have a stake in these answers. That is why each one links to an outside source you can read for yourself.
Which Metal Roof Myths Hold Up?
Two of the nine are partly true, and none is a reason to rule out metal on a Texas home. The details, and the sources, follow the table.
| Myth | Verdict | What is actually true |
|---|---|---|
| Metal roofs are loud in the rain | Mostly false | With a solid deck, underlayment and attic insulation beneath, rain sounds about the same as on other roofs |
| Metal makes the house hotter | False | Light and cool-pigment finishes keep attics cooler than dark shingles |
| Metal attracts lightning | False | Height, shape and isolation decide where lightning strikes |
| Hail will ruin a metal roof | Partly true | Large hail can dent metal; rated systems resist cracks and leaks |
| Metal roofs rust | Mostly false | Galvalume coatings and PVDF paint protect steel; aluminum, copper and zinc do not rust |
| Metal kills cell signal | Mostly false | Most homes notice little change; Wi-Fi calling covers weak spots |
| You cannot walk on a metal roof | False, with care | Crews walk them daily; homeowners are safer on the ground |
| Metal can always go over old shingles | Partly true | Only over one sound layer, and a tear-off is usually better |
| Metal makes a house look like a barn | False | Shake, shingle, slate and tile looks are all made in metal |
Is a Metal Roof Loud When It Rains?
Not when it is built the way homes are built. The drumming people remember comes from barns, carports and pole buildings, where panels are screwed to open framing with nothing under them to soak up sound.
On a house, panels sit on solid plywood or OSB decking under a layer of underlayment, with an insulated attic below. In a Metal Roofing Alliance release, the industry group says a roof assembled that way passes along no more sound than an asphalt roof, and that a noisy metal roof can point to loose or missing fasteners or missing insulation.
Hail is another matter: big stones are loud on every roof. For the quietest result, ask what underlayment goes under the panels and confirm the attic insulation is as deep as your home needs.
Does a Metal Roof Make the House Hotter?
No. The panel itself gets hot in direct sun, but how much heat reaches the attic depends on how much sunlight the finish reflects and how fast it lets heat go. A light or cool-pigment metal roof usually keeps the attic cooler than dark shingles do.
When the Florida Solar Energy Center compared matched homes, peak attic air reached about 101 degrees under a white metal roof and about 136 degrees under dark shingles. Cool pigments explain why darker colors can still help: as the Heat Island Group at Berkeley Lab describes, they reflect the invisible infrared part of sunlight, which lets a cool-pigment charcoal stay noticeably cooler than a standard one.
Color still rules: a black roof of any material runs hot. Look up a color’s rated reflectance in the Cool Roof Rating Council directory, compare PVDF options on our color chart, and read our energy savings guide for realistic numbers. Under the panels, we use underlayment rated for the higher temperatures metal reaches.
Do Metal Roofs Attract Lightning?
No. The National Weather Service lightning myths page says height, pointed shape and isolation control where lightning strikes, and that metal makes no difference to where a bolt lands.
The Metal Construction Association agrees. Its technical bulletin, summarized here, states that roof material does not change a building’s risk of being struck. It adds two honest points: a metal roof is not lightning protection, and because metal does not burn, it may be the better roof to have if a strike does happen.
If your house stands tall and alone on open acreage, a lightning protection system designed to NFPA 780 is worth asking a specialist about. That choice has nothing to do with whether the roof is metal or shingles.
Will Hail Ruin a Metal Roof?
Rarely. Large hail can dent metal, but a dent is not a leak. UL 2218, the impact test behind Texas insurance credits, checks whether a roof covering cracks or ruptures when a 2-inch steel ball hits it; it does not score dents.
In a staged IBHS hailstorm demonstration, standing seam panels dented without being punctured while standard shingles cracked. The real risk is on the insurance side. In 1998 TDI approved an optional cosmetic hail exclusion, described in bulletin B-0030-98, and many carriers now use their own versions, so a dented but watertight roof may go unpaid.
Choices that hide dents help: 24-gauge steel, striated or low-gloss panels and textured stone-coated steel. Our Class 4 metal roofing page lists rated systems, and after a storm our hail damage and insurance claims guide explains how to document what happened.
Will a Metal Roof Rust in Texas Humidity?
Not the systems used on homes today, when they are installed and cared for properly. The steel panels we form are coated with Galvalume, a 55 percent aluminum-zinc alloy that pairs a barrier layer with sacrificial zinc; Wheeling-Nippon Steel says its corrosion resistance far exceeds that of galvanized sheet. On top goes PVDF paint of the Kynar 500 type, which outlasts SMP paint against fading and chalking.
Rust trouble usually starts with contact or runoff, not humidity: copper touching the panels or draining onto them, pressure-treated lumber, or wood blocks and pads that hold moisture against the metal. The Metal Construction Association’s bulletin on dissimilar metal corrosion warns against each of these, and careful crews sweep cutting debris off the roof before they leave.
Aluminum does not rust at all, and copper and zinc weather to a protective patina; see copper and zinc roofing. On our standard PVDF colors, the coil coater backs the paint with a 40-year finish warranty, explained on our warranties page.
Does a Metal Roof Block Cell Signal?
Less than most people fear. The Metal Roofing Alliance, a manufacturers’ group, calls the interference negligible and blames weak service mostly on carrier coverage, tower locations and router placement.
Here is the honest caveat: any roof and wall assembly weakens a signal somewhat, and booster sellers report measurable losses inside metal buildings. Signal also comes through windows and walls, not just the roof. If coverage at your house is already marginal, turn on Wi-Fi calling, move the router to a central spot or add a signal booster.
Can You Walk on a Metal Roof?
Yes, with care, and ideally by a roofer. Crews walk metal roofs every day, stepping in the flat of the panel close to the seams over solid decking and wearing soft-soled shoes. DECRA notes that its stone-coated steel is typically more walkable than other roofing.
Careless steps can crease a panel or flatten a seam, and painted metal turns slick with dew or rain. Ask satellite, solar and HVAC crews to coordinate with your roofer before they climb up. Homeowners are safer on the ground; binoculars and a phone camera show most of what you need to see.
Can a Metal Roof Go Over Old Shingles?
Sometimes, but less often than ads suggest. Section R908 of the 2021 International Residential Code allows a recover over one dry, sound layer when the panel maker’s instructions permit it, and a roof that already has two or more layers has to be stripped.
Even where it is allowed, tearing off lets everyone inspect the deck, rebuild the flashing and give flat panels a flat base. Our guide to metal over shingles in Texas compares both paths, and the installation process page shows each step of a full replacement.
Does a Metal Roof Make a House Look Like a Barn?
Only if you choose a barn panel. Corrugated and PBR panels have that rural look, and plenty of owners want it on a barndominium or shop. For a traditional house there are metal shingles and shakes from EDCO and Classic, DECRA stone-coated steel in shake and tile profiles, slate looks such as Slate Rock Oxford, and barrel tile looks such as Grandetile.
Standing seam in a dark or bronze PVDF color reads as modern or farmhouse rather than rural. Weighing metal against a new shingle roof? Our metal roof vs. shingles comparison covers cost, resale and when shingles make more sense.
More Metal Roof Myth Questions
Is hail louder on a metal roof than on shingles?
It can sound sharper, because hard ice striking metal makes a crisper noise than ice striking asphalt. Solid decking, underlayment and attic insulation soak up most of it, and large hail is loud on any roof. The noise ends with the storm; have the roof checked afterward either way.
Do I need lightning protection because my roof is metal?
Not because of the metal. The National Weather Service says height, shape and isolation decide where lightning strikes, not roofing material. If your home stands tall or alone on open land, ask a lightning protection specialist about a system designed to NFPA 780, the standard the Metal Construction Association points to.
Do metal roofs leak around the screws?
Exposed-fastener panels such as PBR depend on screws with rubber washers that age in the sun, so they need periodic checks and replacement screws over the years. Standing seam fastens to concealed clips hidden under the seams, so nothing pierces the face of the panel.
Does a dark metal roof heat the house more than dark shingles?
Generally not, though the edge is smaller than with a light color. A dark cool-pigment PVDF finish reflects more infrared sunlight than ordinary dark paint, and metal releases heat quickly at sunset. For the largest cooling benefit, choose the lightest color your HOA accepts.
Will my insurance pay for hail dents on a metal roof?
That depends on your policy. Texas policies generally cover hail damage that lets water in, but some exclude cosmetic damage that only changes how the roof looks. Read your endorsements before you pick a roof, and photograph the roof from the ground after each storm.
What is the real lifespan of a metal roof under Texas weather?
Commonly 40 to 70 years when experienced installers put it on, while asphalt shingles here often wear out in 15 to 20. Every standing seam roof from us carries a Lifetime Non-Prorated Limited Warranty that applies to labor as well as material. A buyer can receive it one time if you sell. It leaves out acts of God, such as a tornado, hail, flood or fire, because those are insurance matters.
Free estimate
Ask Us the Question We Did Not Cover
Send your question with your estimate request. We will answer it plainly and price the roof that fits your house.
Get Your Free Metal Roof Estimate
Tell us about your roof. Our Mesquite office calls back the same business day to set up a free measurement and an itemized written estimate.
Prefer to talk now? Call (469) 466-2421.
Get Straight Answers From a Metal Roof Installer
Call (469) 466-2421. The office returns calls the same business day, and the people on your roof are our own crews, roofing in metal since 2006.
