Standing seam: snap lock
Snap Lock Standing Seam Metal Roofs for Dallas-Fort Worth
A snap lock standing seam metal roof joins each panel to the next by pressing one seam leg over the other until it seats. There is no seaming machine and no exposed screw. Permanent Metal Roofing Systems forms snap lock in three seam heights for roofs pitched at 3/12 or steeper.
- 20+ years of experience
- Lifetime limited warranty
- Free written estimates
How does a snap lock seam work?
Two parts do the work: a clip and a pair of interlocking legs. Clips screw to the roof deck and grab the male leg of one panel. The next panel’s female leg then presses down over that leg, hiding the clip and every screw.
No crimping tool closes the seam. That is why snap lock goes on faster and costs less than a mechanically seamed panel in the same metal. The tradeoff is pitch. The seam depends on water draining quickly, so PMRS holds snap lock to 3/12 and steeper.
Each size has its own seam detail. Our 1.5″ panel uses a narrow batten-cap seam that snaps over a rigid, continuous interlocking leg. The 1.75″ panel adds a factory-applied sealant bead inside the seam and offers an optional snap-on batten.
Snap lock is one of two families in our standing seam metal roofing line. The other is mechanical lock, covered further down this page.
Which snap lock size should you choose?
Pick by look, span and the surfaces around the roof. All three sizes share the 3/12 minimum, so the choice comes down to seam height, panel width and support.
| Spec | 1″ snap lock | 1.5″ MD snap lock | 1.75″ MD snap lock |
|---|---|---|---|
| Seam height | 1″ | 1-1/2″ | 1-3/4″ |
| Panel width | Typically 12″ to 16″ | 12″ to 20″ (variable) | 12″ to 18″ (variable) |
| Duty | Residential steep slope | Medium duty: residential, light commercial, industrial | Medium duty: residential, commercial, industrial |
| Support | Solid deck | Solid deck | Solid deck or open framing |
| Seam detail | Low, simple snap seam | Narrow batten-cap seam over a rigid leg | Factory sealant bead; optional snap-on batten |
| Substrates | Steel or aluminum; confirm gauge with us | 26, 24, 22 ga steel; .032″ and .040″ aluminum | 26, 24, 22 ga steel; .032″ and .040″ aluminum |
| Spec sheet | On request | 1.5″ MD sheet (PDF) | 1.75″ MD sheet (PDF) |
| Best for | Dormers, bays, smaller homes, accents | Roofs that wrap into mansards, fascia, walls or soffits | All-round residential and commercial; open-framed structures |
The 1″ snap lock keeps the seam low and the roof calm-looking. It suits smaller houses, dormers and bay roofs where a tall rib would look heavy.
The 1.5″ snap lock is the architect’s panel. Its seam can turn from the roof onto a mansard, fascia, wall or soffit without changing profile.
The 1.75″ snap lock is our most popular system. Its taller structural seam adds spanning and uplift capacity, and it can go over open framing as well as a solid deck.
Where does snap lock fit on DFW homes and buildings?
Snap lock suits most pitched roofs in the Metroplex: ranches, two-story suburban homes, retail pads, churches and light commercial buildings. It is not the panel for flat porch roofs or low-slope additions.
Hail
Order 24-gauge steel when hail is the worry, since it is roughly 28 percent thicker than 26-gauge. Large stones can still dent any panel. Insurance credits depend on a UL 2218 Class 4 rated assembly, which our Class 4 metal roofing page explains.
Heat and expansion
Panels grow and shrink with every heat cycle, and DFW typically sees about 20 days a year at or above 100 F. Floating clips let the metal slide instead of pulling at fasteners. High-temperature underlayment keeps the layer below from softening.
HOAs
Snap lock reads as clean vertical lines, a look many architectural committees accept. We supply spec sheets and color samples for the submittal. Texas Property Code 202.011 also limits how an HOA can block impact-resistant or energy-efficient roofing that fits the neighborhood.
How do we install a snap lock roof?
We install snap lock as a complete system, with panels and trim formed for that specific roof. A typical residential job runs in this order.
- Tear-off and deck check, replacing damaged decking where we find it.
- High-temperature underlayment across the deck, with self-adhered membrane at eaves, valleys and penetrations.
- Drip edge, eave and valley flashing, bent on our computerized equipment in the roof color.
- Panels roll-formed to the length of each run, clipped at the specified spacing and snapped together course by course.
- Pipe boots, ridge vent or closures, and counter-flashing at walls and chimneys.
- A walk of every seam and flashing detail before cleanup.
What does a snap lock roof cost in DFW?
Snap lock is the least expensive way to get standing seam. Our installed price for 24-gauge Galvalume in Kynar 500 is $15 per square foot of roof, as of October 2026.
- 26-gauge SMP panels: $14 per square foot installed
- Roofs pitched 8/12 and steeper: add $2 per square foot
- Tear-off: $1.25 per square foot for the first layer
- Contractor materials packages in 24-gauge: $9 per square foot
Aluminum and Tedlar finishes are quoted per job. Our metal roof cost calculator gives a fast range for your house.
Snap lock or mechanical lock: which should you pick?
Choose snap lock for a pitched roof where speed and budget matter most. Choose mechanical lock when the roof is flatter than 3/12, the site has high wind-uplift requirements, or you want copper, zinc or a weather-tightness warranty.
- Roof under 3/12? Go to mechanical lock standing seam, which is rated down to 1/2:12.
- Tight budget on a shop or barn? Look at corrugated and exposed-fastener panels.
- Accent turret or curved bay? Consider flat lock metal panels.
Our article on snap lock vs. mechanical lock walks through the tradeoffs in more depth.
A snap lock project from our files
One retail building shows what the profile can do. Its roof slopes all run steeper than 3/12, and we covered them in 1.5″ snap lock formed from .032 aluminum. The finish was matte black Tedlar PVF film, and we fabricated custom box gutters to match.
Aluminum and Tedlar are not the default for a house, but they show the range. The same panel also comes in steel and standard PVDF colors, backed on PMRS standing seam by our lifetime non-prorated limited warranty.
Snap lock questions we hear most
What is the minimum slope for a snap lock metal roof?
PMRS snap lock panels need a minimum slope of 3/12, a 3-inch rise for every 12 inches of run. Flatter roofs need a mechanically seamed panel, such as our 1.5″ mechanical lock rated to 1/2:12.
Can snap lock panels go over open framing?
The 1.75″ snap lock is the size listed for open framing as well as a solid deck. We install the 1″ and 1.5″ panels over solid decking.
What warranty comes with a snap lock roof?
PMRS standing seam roofs carry our lifetime non-prorated limited warranty on material and labor. The paint has its own coil-coater warranty, such as 30 years on solid Kynar 500 colors. See our warranties page for terms.
Can I buy snap lock panels for my own crew?
Yes. We sell roll-formed snap lock panels, trim, clips and accessories to contractors, cut to length from your take-off or ours. Shop drawings and submittals are available for commercial work.
Will snap lock panels hold up in high wind?
Wind resistance comes from clip type, clip spacing and deck attachment. We follow the panel spec and can provide site-specific engineering when a job has uplift requirements. Where uplift is severe, a mechanically seamed panel is usually the safer choice.
Will my snap lock roof show oil canning?
Any flat metal pan can show some waviness, called oil canning, and it is not a defect. Narrower panels, heavier gauge, a flat deck and optional ribs or striations all reduce it.
Get Your Free Metal Roof Estimate
Tell us about your roof and a Permanent Metal Roofing Systems specialist will follow up to schedule your free estimate. No pressure, no obligation.
Prefer to talk now? Call (469) 466-2421.
Ready to price a snap lock roof?
Tell us about the house or building. We will recommend a seam height, gauge and color, then send a written estimate.