Roofing Materials
Standing Seam Metal Roofing Specifications
Most roofing companies will tell you their roof is "high quality." Very few will hand you the exact specifications, independent test ratings, and installation standards they build to. We believe you deserve to know exactly what is going on your home before you sign a contract.
Every standing seam roof we install is built to a published specification. We form our own 1.5-inch SnapLock standing seam panels on our roll-former using premium Galvalume steel or aluminum coil, install them over a fully adhered Polyglass Polystick XFR underlayment, and secure them with heavy-duty floating clips using double the manufacturer-recommended clip count.
This page serves as the specification sheet for the roofing systems we build. It brings together the materials, dimensions, installation standards, independent performance ratings, and warranties in one place, with links to the detailed pages that explain each component.
Learn more about our roofing materials: Roofing Materials
Our standard roofing system includes:
- 1.5-inch SnapLock standing seam panels
- 16-inch panel width
- Premium coated Galvalume steel or aluminum
- 22 or 24-gauge steel, never 26-gauge
- .032-inch or .040-inch aluminum
- 70% Kynar 500 PVDF finish
- Concealed heavy-duty floating clips
- Polyglass Polystick XFR full-deck underlayment
- UL 790 Class A Fire Rating
- UL 580 Class 90 Wind Uplift Rating
- UL 2218 Class 4 Impact Rating
- 8-year workmanship warranty plus a 40-year manufacturer finish warranty
Standing seam metal roofing specification cutaway.
A finished standing seam metal roof showing clean panel alignment, concealed fasteners, and crisp 1.5-inch standing seams.
Standing Seam Specifications at a Glance
The specifications below define the standard standing seam roofing system we build. Rather than relying on marketing language, we publish the exact materials, dimensions, installation standards, and independent performance ratings that go into every roof.
| Specification | Our Standard |
|---|---|
| Panel Profile | 1.5-inch SnapLock standing seam |
| Panel Width | 16 inches |
| Material | Premium coated Galvalume steel or aluminum |
| Steel Gauge | 22-gauge (.0285 inch) or 24-gauge (.0236 inch), never 26-gauge |
| Aluminum Thickness | .032-inch or .040-inch |
| Finish | 70% Kynar 500 PVDF |
| Clips | Concealed heavy-duty 16 to 18-gauge floating clips, two fasteners per clip |
| Clip Spacing | 12 inches on center in the field, 9 inches on center at the perimeter |
| Underlayment | Polyglass Polystick XFR, 80 mil self-adhered full-deck (rated to 265°F) |
| Roof Deck | Minimum 1/2-inch (15/32-inch) APA-rated plywood or solid wood |
| Minimum Slope | 3:12 for SnapLock; mechanical (double-lock) system for lower slopes |
| Fire Rating | UL 790 / ASTM E108 Class A |
| Wind Uplift Rating | UL 580 Class 90 |
| Impact Rating | UL 2218 Class 4 |
| Workmanship Warranty | 8 years |
| Finish Warranty | 40-year manufacturer Kynar 500 finish warranty |
These are the specifications we build to every day. The sections below explain what each specification means and provide links to the detailed pages covering each component of the roofing system.
Key Specs Explained
Panel and Seam
We form our own 1.5-inch SnapLock standing seam panels on our roll-former using premium coated Galvalume steel or aluminum coil. Each panel is 16 inches wide, uses concealed floating clips, and has no exposed fasteners. For low-slope roofs and specialized high-wind applications, we also offer a mechanical (double-lock) standing seam system.
Learn more:
Gauge and Thickness
We install 22-gauge (.0285 inch) and 24-gauge (.0236 inch) steel. We never install 26-gauge steel. Aluminum roofing is measured in inches, not gauge, and is available in .032-inch and .040-inch thicknesses.
Learn more:
24 Gauge vs. 26 Gauge Metal Roofing70% Kynar 500 Finish
Every roof we install features a 70% Kynar 500 PVDF finish, not the less expensive SMP coating found on many metal roofs. The finish is backed by a 40-year manufacturer finish warranty for long-term color retention and durability.
Learn more:
Kynar 500 vs. SMP Paint SystemsClips and Fasteners
We install heavy-duty 16 to 18-gauge floating clips with two fasteners per clip. Clips are spaced 12 inches on center in the field and 9 inches on center around the roof perimeter, using approximately double the manufacturer-recommended clip count. Floating clips allow the panels to expand and contract with temperature changes.
Learn more:
Standing Seam Clips & FastenersUnderlayment and Deck
Every standing seam roof is installed over Polyglass Polystick XFR, an 80 mil self-adhered full-deck underlayment rated to 265°F with Burn-Shield fire and ember resistance. We also install ice and water shield at eaves and valleys. Roofing is installed only over a minimum 1/2-inch (15/32-inch) APA-rated plywood or solid wood deck, and we always tear off to a sound deck before installation.
Learn more:
Tested and Code-Listed
Our standing seam roofing system is backed by independent testing and third-party evaluation reports, not marketing claims. The fire, wind, and impact ratings below are established through nationally recognized testing standards and manufacturer listings.
UL 790 / ASTM E108 Class A Fire Rating
Class A is the highest fire classification available for roofing systems. Our standing seam roof assembly is tested to UL 790 / ASTM E108 Class A, providing outstanding resistance to external fire exposure when installed as the tested roof assembly.
Learn more:
Class A Fire-Rated RoofingUL 580 Class 90 Wind Uplift Rating
Our standing seam roofing system is tested to UL 580 Class 90, the highest wind uplift classification under this standard. Combined with our heavy-duty floating clips and enhanced clip spacing, the system is engineered to perform in demanding wind conditions.
Learn more:
High-Wind Metal Roofing SystemsUL 2218 Class 4 Impact Rating
Our standing seam roofing system is tested to UL 2218 Class 4, the highest impact resistance classification under the UL standard. This rating demonstrates excellent resistance to hail impacts and other common forms of roof impact damage.
UL and ICC-ES Evaluation Reports
The roofing systems we install are supported by manufacturer UL listings and ICC-ES evaluation reports, providing independent verification that the products have been tested and evaluated for their intended applications.
Warranty Coverage
Our workmanship warranty and the manufacturer's finish warranty protect different parts of your investment.
- We provide an 8-year workmanship warranty covering our installation.
- The manufacturer provides a 40-year Kynar 500 finish warranty covering the factory-applied paint finish.
Learn more:
Standing Seam Warranty GuideFrequently Asked Questions
Reviews
What Our Clients Say
Susan M.
Calabasas, CA
The Metal Roof Pros installed a dark bronze standing seam on our home and it completely transformed the exterior. Their crew was detail-oriented and left the property spotless every day. The finished roof is a showpiece. We get compliments from neighbors constantly.
Michael T.
Thousand Oaks, CA
After getting five quotes from different companies, The Metal Roof Pros were the only team who could explain their gauge, clip spacing, and underlayment system in detail. Their knowledge of standing seam installation is unmatched. The roof looks and performs flawlessly.
Jennifer L.
Encino, CA
We hired The Metal Roof Pros for a charcoal gray Kynar 500 standing seam roof. Karen walked us through every color option and helped us choose the perfect shade to match our stone facade. The color is exactly what we wanted and the finish is stunning.
David R.
Malibu, CA
Living on the coast, we needed a roof that could handle salt air. The Metal Roof Pros recommended their aluminum standing seam system and explained exactly why steel would not work at our location. Two years later, zero corrosion issues. Worth every penny.
Patricia W.
Pacific Palisades, CA
After the 2024 wildfires, we prioritized fire protection for our rebuild. The Metal Roof Pros installed a Class A rated standing seam system with proper ember-resistant detailing at every penetration point. Our insurance company was very impressed with the fire rating documentation.
Robert K.
Agoura Hills, CA
We own a commercial property in Agoura Hills and needed a reliable roofing contractor. The Metal Roof Pros handled our 12,000 square foot standing seam installation on schedule and on budget. Their commercial crew was professional and incredibly efficient.
Maria G.
Sherman Oaks, CA
Karen and the entire Metal Roof Pros team made the process simple from estimate to final walkthrough. They installed seamless rain gutters to match our new metal roof and the integration between the two systems is perfect. Everything drains exactly where it should.
James H.
Beverly Hills, CA
We had The Metal Roof Pros install a 22-gauge standing seam on our hillside property. The heavier gauge was recommended for the wind exposure and steep pitch. The installation quality is exceptional. Every panel, clip, and flashing is precise.
Linda C.
Woodland Hills, CA
The attic ventilation work The Metal Roof Pros did alongside our standing seam installation made a huge difference in our cooling costs. They installed ridge vents and balanced the intake system properly. Our upstairs rooms are noticeably cooler in summer.
Carlos A.
Pasadena, CA
The Metal Roof Pros replaced our old tile roof with a matte black standing seam and it completely modernized our 1960s ranch home. The crew handled the tear-off and new installation in under a week. Clean work, great communication, outstanding result.
Sarah P.
Studio City, CA
We added new rain gutters when The Metal Roof Pros installed our standing seam roof. They color-matched the gutters to the roof panels perfectly. The seamless gutter system handles our heaviest rains without any overflow issues. Excellent craftsmanship throughout.
Thomas B.
Westlake Village, CA
As a retired general contractor, I am extremely particular about installation quality. The Metal Roof Pros exceeded my expectations. Their clip spacing, flashing details, and underlayment application were textbook perfect. This is how metal roofing should be done.
Angela D.
Brentwood, CA
We chose a slate blue Kynar 500 finish and it looks absolutely beautiful on our contemporary home. The Metal Roof Pros helped us visualize the color with actual panel samples before we committed. The 35-year paint warranty gave us total confidence in the investment.
Mark S.
Northridge, CA
Our commercial building needed a complete re-roof and The Metal Roof Pros delivered a standing seam system that solved our persistent leak problems. Their attention to flashing details around our HVAC units and skylights was impressive. No leaks since installation.
Diane F.
Topanga, CA
Living in a Very High Fire Hazard Severity Zone, our insurance required a noncombustible roof. The Metal Roof Pros installed a Class A rated standing seam system that satisfied every code requirement. Our premium dropped significantly after we submitted the documentation.
Susan M.
Calabasas, CA
The Metal Roof Pros also handled our attic insulation upgrade when they installed the metal roof. The combination of reflective metal panels and proper insulation cut our summer energy bill by about 20%. The house stays cooler without running the AC as hard.
Robert K.
Agoura Hills, CA
We brought The Metal Roof Pros back for a second commercial project because the first installation was flawless. They understand the unique demands of commercial roofing, including foot traffic paths, equipment mounting, and drainage slopes. Highly recommended for any commercial job.
Maria G.
Sherman Oaks, CA
Our home is near the coast and The Metal Roof Pros recommended aluminum panels instead of steel for our location. The aluminum standing seam system has held up perfectly against the salt air. No corrosion, no discoloration, and the warranty covers us for decades.
James H.
Beverly Hills, CA
The gutter installation by The Metal Roof Pros was just as impressive as the roof work. They used 6-inch seamless aluminum gutters with hidden hangers, and the downspout routing was carefully planned to keep our landscaping protected. Outstanding detail work.
Jennifer L.
Encino, CA
When it came to fire hardening our property, The Metal Roof Pros provided a complete assessment. They installed a noncombustible standing seam roof and sealed every vent and soffit with ember-resistant materials. Our home now meets the latest California wildfire building codes.
Get Your Free Quote
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