Metal roofing in San Antonio: standing seam and the Forever Roof.
Two residential metal roofs, installed as systems. Standing seam for the modern and ranch look, in 24-gauge steel on concealed clips with a PVDF finish for long-term color retention. Stone-coated steel, the Forever Roof, when the HOA wants shingles or tile and you want the last roof the house needs. Corrugated and R-panel have their place on barns, porches and workshops, and their own page. We will tell you which one your house actually wants.
Get your roof price in 30 seconds.
A replacement range for your own roof. Start with your address.
Sample replacement prices. Your range follows a free inspection.
Real Mammoth roof work
Pick the panel by the house, not the brochure.
Standing seam
24-gauge Galvalume panels on concealed clips, with a PVDF finish. The cleanest look, the fewest penetrations, the longest life of any painted roof.
Standing seamStone-coated steel · the Forever Roof
Real stone bonded to interlocking steel panels in shake, tile or slate profiles. The strength of metal with the look most HOAs approve, and the Two Tusk warranty: a limited lifetime manufacturer warranty on the panels, and 10 years on our workmanship.
The Forever RoofMetal vs shingle, decided by your roof.
Pitch, HOA, budget, how long you'll be in the house. The free Roof Grade answers it in writing.
Book the grade, freeCorrugated & R-panel, for outbuildings
Exposed-fastener panels for barns, workshops, porches and ranch outbuildings. Tough and economical, and not what we put on a house when the two systems above are on the table.
CorrugatedThe honest comparison.
Relative, not absolute: your quote shows the actual numbers for your roof. Manufacturer warranties are summarized here, not quoted; ask for the warranty document for any product.
| Feature | Architectural shingle | Standing seam | Stone-coated steel (Forever Roof) |
|---|---|---|---|
| Typical service life | 25–30 years | 40–70 years | Limited lifetime manufacturer warranty on the panels |
| Hail | Class 4 options resist most hail; bruising still happens | Very good, with Class 4 rated panels available; very large hail can dent panels | Class 4 impact rating; stone finish hides marks |
| Wind | Six-nail pattern helps; seal strips are the weak point | Concealed clips; excellent | Interlocking on four sides; excellent |
| Weight | Heaviest of the three | Light | Light — no structural work |
| Look / HOA | Everyone accepts it | Modern, ranch, commercial; some HOAs say no | Shake, tile or slate look; most HOAs approve |
| Installed cost | $ | $$$ | $$$ |
| Warranty | Manufacturer + Mammoth 10-year workmanship | Manufacturer finish + Mammoth 10-year workmanship | Manufacturer limited lifetime + Mammoth 10-year workmanship |
Relative comparison. The written inspection determines the scope and price for your roof, side by side.
What the panel is made of matters as much as the profile.
Every material is quoted with its gauge, finish and warranty named on the paper.
Galvalume steel
The workhorse: 24-gauge for standing seam, heavier than the 26-gauge metal common on homes. Zinc-aluminum coated steel, painted with a PVDF finish for long-term color retention.
Stone-coated steel
Steel panels with a bonded stone-granule finish. The Forever Roof. Light, quiet, and it looks like the roof the HOA wanted.
Aluminum
For coastal air and the odd chemical environment where steel would corrode. Softer, so hail marks it more easily.
Copper
Accent roofs, bay windows, porches. Beautiful, expensive, and it patinas — which is the point.
How Mammoth builds a standing-seam roof.
The panel is the part you see. The system is why it lasts, and these are the details that go into it.
24-gauge steel
We typically use 24-gauge Galvalume panels, heavier than the 26-gauge metal common on homes.
A membrane over the whole deck
A high-temperature, self-adhered ice-and-water membrane covers the entire roof deck instead of standard felt, which gives the roof a much stronger secondary water barrier beneath the metal.
Concealed clips
Hidden clips hold the panels while letting them expand and contract as the temperature changes.
Rivets, not exposed screws
Where a detail needs exposed fastening, we use corrosion-resistant rivets rather than relying on exposed roofing screws.
The right seam for the structure
Snap-lock, single-lock or double-lock mechanically seamed: the system is chosen for the structure and how the roof has to perform, rather than treating every roof the same.
Oil canning, honestly
Oil canning, a slight waviness in flat metal, is a natural trait of architectural metal. On smooth panels we use backing techniques to reduce how much it shows, and striated panels have relief built in. We will not tell you it can be eliminated.
Class 4 impact ratings
Class 4 impact-rated systems are available, depending on the specific panel and manufacturer.
A PVDF finish
A premium PVDF finish for long-term color retention and weather resistance, named on your quote.
Metal and insurance, one company
Many metal contractors are mainly retail installers, and many insurance restoration contractors have little experience with architectural metal. Our crews understand both, so one company handles both sides of the job.
The finish is half the roof: PVDF, SMP and polyester, explained.
On a painted metal roof the steel outlasts the paint, so the finish decides how the roof looks in the years ahead. The finish is named on every Mammoth metal quote, and this is why it matters.
PVDF (Kynar 500® / Hylar 5000®)
The premium finish: a resin that is at least 70% polyvinylidene fluoride. The best resistance to fading, chalking and gloss loss of any metal roof coating, which is why manufacturers back it with their longest color warranties. It is the finish on the standing seam we install, and your quote names it.
SMP (silicone-modified polyester)
The middle tier: a polyester resin improved with silicone, usually around 30% of the resin. Better than plain polyester, noticeably behind PVDF over a Texas decade; its fade warranties typically run shorter. Common on barn and agricultural panels.
Polyester
The economy finish on the cheapest exposed-fastener panels. It chalks and fades fastest under Texas sun. Fine on a shed; not what we put on a home.
Why coating quality matters here
Texas sun is the test. A PVDF finish keeps its color and its gloss while an SMP roof on the next street has chalked pale; the panel underneath is the same steel. Ask any metal quote to name the finish system and its color warranty, and compare the years.
Four things we check before we recommend it.
- Pitch and layout. Standing seam loves simple, low-slope roofs. Cut-up roofs with many hips and valleys push the price up fast; stone-coated steel handles them better.
- The HOA. Many north San Antonio HOAs allow stone-coated steel and refuse bare standing seam. We check the covenants before we quote.
- How long you'll stay. Metal pays back over decades. Selling in five years? A Class 4 shingle may be the smarter money.
- The deck under it. Metal over a rotten deck is a rotten roof with a nice hat. We inspect and price decking per sheet.
Straight answers before you book.
Ask your local teamIs a metal roof loud in the rain?
Not over a solid deck with underlayment, which is how we install every one. The tin-roof sound comes from panels screwed over open purlins on barns.
Does metal attract lightning?
No. Lightning strikes the tallest object regardless of material; a metal roof is non-combustible, which is the safer side of that equation.
Can you install metal over my existing shingles?
Sometimes, and we'll say when it's a bad idea. Most homes get a full tear-off so the deck is inspected; the price difference is smaller than people expect.
Will my insurance be cheaper with a metal roof?
Class 4 impact-rated roofs, including stone-coated steel, qualify for a discount with many Texas insurers. The amount varies by carrier; we give you the certificate.
Is the inspection really free?
Yes — it's the same Roof Grade visit for every service. Attic first, 75–150 photos, the 32-point Hunter-Gatherer Report, a letter grade and a plain-English verdict. You get the written report whether you hire us or not.
Will you tell me if I don't need the work?
Yes. An A grade is a handshake and a date to look again. A B means a few small repairs, priced in the open, on a roof with years left in it. We'd rather be the roofer you call in ten years than the one who sold you a roof you didn't need.
What warranty comes with the work?
Repairs carry a workmanship warranty in writing on the invoice. Full replacements carry the Mammoth Two Tusk Limited Lifetime Warranty: our 10-year workmanship warranty on the installation, plus the manufacturer's lifetime material warranty on the materials, which means the life of that product on the manufacturer's written terms. Ask us for the warranty document and read it before you sign.
What is a Kynar finish?
Kynar 500® is a brand of PVDF (polyvinylidene fluoride) resin; a finish sold under that name must be at least 70% PVDF resin. It is the coating with the best fade and chalk resistance on a painted metal roof, and the one on the standing seam panels we quote. The finish and its color warranty are named on your paperwork.
Know where
your roof stands.
The Roof Grade is free. The report is written.
What happens next is your decision.
- 32 inspection points, attic first
- 75–150 photos of what we find
- An honest, written recommendation