How do you install metal roofing? You prep the deck, roll out underlayment, set the drip edge and flashing, fasten the panels with the correct overlap, then cap the ridge and inspect every seam. Skip or reorder any of those steps and you're signing up for a leak you won't find until the first hard rain.
This guide breaks down each stage in the order manufacturers and licensed crews actually follow it. Whether you're hiring the job out or climbing the ladder yourself, knowing what each step should look like helps you catch shortcuts before they cost you a roof.
What Tools and Materials Do You Need Before You Start?
A half-finished panel row because you're short on screws or closure strips leaves your deck exposed to weather overnight. Gather everything below before anyone climbs a ladder.
Materials:
- Metal roofing panels (ordered 10-15% over your measured square footage for waste and overlap)
- Synthetic or self-adhered underlayment
- Drip edge and rake trim
- Closure strips (inside and outside)
- Ridge cap
- Butyl tape and compatible sealant
- Roofing screws with rubber washers, color-matched to your panels
Tools:
- Metal snips or an electric shear
- Cordless drill/driver (impact driver for high-volume fastening)
- Chalk line
- Tin snips or a panel brake for trim bends
- Tape measure and square
- Fall-protection harness and anchor points
Fastener and trim colors should match the panel finish most suppliers carry matched hardware for this reason. Fall protection isn't optional once you're above six feet: OSHA's construction standard requires guardrails, a safety net, or a personal fall arrest system for employees engaged in residential construction activities 6 feet or more above lower levels , and that threshold is a reasonable line for a DIY homeowner to follow too, even without a legal mandate.
Which Metal Roofing Panel Type Should You Install?
Panel type determines your fastening method, overlap pattern, and tool list, so pick it before you order trim or screws.
| Panel Type | Fastening Method | Fasteners Visible | Best For |
|---|---|---|---|
| Exposed-fastener (corrugated) | Screwed through the panel face | Yes | Budget projects, DIY installs, outbuildings |
| Standing seam | Hidden clips under raised seams | No | Long-term weather resistance, higher-end homes |
| Stone-coated steel | Screwed similar to exposed-fastener | Mostly hidden under coating | Shingle or tile look with steel durability |
| Metal shingles | Interlocking pieces, fastened at overlaps | Partially hidden | Roof-over projects where full tear-off isn't practical |
Exposed-fastener panels are the simplest to install but carry more penetration points that can loosen over decades. Standing seam systems cost more upfront but have no exposed screw heads for sealant to fail around later. For a closer look at how panel profile affects your layout, see our metal roofing services page.
How Do You Install Metal Roofing? The Full Step-by-Step Process
The sequence below follows the general order used across manufacturer instructions and licensed installers: deck prep, underlayment, trim, panels, ridge cap, inspection. Reordering these steps is one of the fastest ways to end up with a leak you can't locate later.
Step 1: Prepare the Roof Deck
Decide whether you're going over existing shingles or doing a full tear-off. That decision depends on your roof's condition, weight limits, and local code.
Inspect the decking for rot or soft spots and replace any damaged sections before moving forward. The surface needs to be smooth, clean, and completely dry, since moisture trapped underneath won't dry out once panels seal it in.
One detail most DIY guides skip: under the International Residential Code, a complete and separate roofing system, such as a standing-seam metal roof designed to transmit loads directly to the building's structure, is not required to remove the existing roof covering first . That exception doesn't apply to every panel type or every local amendment, so confirm it with your building department before skipping tear-off. If you're unsure whether your roof qualifies for a roof-over, our roof installation team can evaluate it before you buy materials.
Step 2: Roll Out the Underlayment
Working from the eave toward the ridge, roll out a waterproof barrier across the deck, overlapping each course by several inches per the manufacturer's spec. This step is the one most DIYers rush, and it's also the one that determines whether everything installed above it actually performs.
Step 3: Install Drip Edge, Flashing, and Closure Strips
Drip edge goes along the eaves and rakes first, fastened at consistent intervals, typically every 12 to 16 inches, to keep water moving away from the fascia instead of behind it. Flashing goes in at any valleys, walls, or penetrations before panels cover those areas.
Closure strips, sealed with butyl tape, fill the gaps between the panel ribs and the drip edge to block wind-driven rain and pests. This eave-side starter trim is different from the ridge-side trim you'll install later, so don't confuse the two.
Step 4: Fasten the Metal Panels
Square your first panel against the eave or gable, allowing a slight overhang beyond the drip edge, then work across the roof so each upper panel laps over the lower one. Fasten through the flat part of the panel, never through the rib, using washered screws snugged just enough to compress the rubber without crushing it.
Pay attention to prevailing wind direction when choosing which side to start on. Starting against the wind reduces the chance of water driving under the overlap.
Exposed-fastener panels use visible screws spaced roughly every 12-24 inches along the ribs. Hidden-clip standing seam systems attach through concealed clips beneath the seam, with no screw heads exposed to the sun at all. Fastener spacing and overlap amounts vary by panel profile and wind-load zone, so check your manufacturer's specs or installation guidance from a body like the Metal Construction Association before finalizing your layout.
Step 5: Close the Ridge
Place outside closure strips a few inches below the roof peak, sealed with butyl tape against both the panels and the underside of the ridge cap. This creates the final barrier against wind and rain at the roof's highest point.
Once every panel is fastened and the closures are set, screw the ridge cap down along both slopes, overlapping sections by a few inches and sealing joints with compatible sealant. If your project includes ridge or attic ventilation, this is also the stage to coordinate those components, which our ridge vent installation crews typically handle alongside the ridge cap.
Step 6: Final Inspection and Cleanup
Check every fastener for tightness, confirm no gaps exist at flashing or trim joints, and walk the full roof slope by slope. Loose screws or missed closures are far easier to fix now than after the first storm.
Clear away metal shavings and drill burrs immediately. Left on the panels, they rust within days and leave orange streaks that are nearly impossible to remove from a painted finish. A quick blow-off or magnetic sweep at the end of the job prevents a rust headache later.
What Are the Most Common Metal Roofing Installation Mistakes?
Most metal roofing failures trace back to a handful of repeat mistakes, not faulty material.
- Over-driven screws. Fastening too tight compresses or splits the rubber washer and restricts the panel's ability to expand and contract with temperature swings, eventually cracking the screw hole.
- Trapped shavings. Metal filings left sitting on the panel surface rust quickly and bond to the paint, leaving permanent stains.
- Wrong underlayment for the climate. A standard felt underlayment in a high-humidity or ice-dam-prone region won't hold up the way a synthetic or self-adhered membrane will.
- Fastening through the rib instead of the flat. This traps water against the screw instead of letting it run off.
- Ignoring thermal movement. Metal panels move measurably with temperature, and fastener holes are typically sized slightly oversized to allow that movement without stress-cracking the panel.
On jobs across Longview, Vancouver, and Kennewick, our crews see over-driven screws cause more callback leaks than any other single installation error, usually from a drill clutch set too high on day one and never adjusted. If you'd rather have a professional double-check your plan before you start cutting panels, reach out for a free estimate.
Can You Install a Metal Roof Yourself, or Should You Hire a Pro?
Experienced DIYers with the right tools can install a metal roof. Steep pitches, heavy panels, and fall risk are why most homeowners still hire a licensed roofing contractor instead.
Metal roof cost typically runs higher upfront than asphalt shingles, often landing somewhere between $9 and $25 per square foot installed depending on panel type, roof complexity, and region. That range covers both materials and labor, but it's a ballpark figure, so get a site-specific quote before budgeting. For a closer look at how cutting and layout affect the finished job, see our guide on how professionals cut metal roofing.
Homeowners across Southwest Washington can see our full range of roofing and exterior work on the Black Bear Home Exteriors homepage, including crews serving the Southwest Washington Metro area.
FAQ
Can You Install Metal Roofing Over Shingles?
Yes, in many cases, if there's only a single layer of existing shingles, the decking is sound, and local code allows a roof-over. Standing-seam systems designed to carry their own structural load are sometimes exempt from tear-off requirements entirely under the IRC, but a full tear-off is still the safer bet if your roof's history or condition is unclear.
Do You Need a Permit to Install a Metal Roof?
Most jurisdictions require a roofing permit and at least one inspection before and after installation. Requirements vary by local building department, so check with yours before buying materials, and find local service details on our service areas page.
Can You Install a Metal Roof Yourself?
Experienced DIYers with the right tools can install a metal roof, but steep pitches, heavy panels, and fall risk are why most homeowners hire a contractor instead. If you're on the fence, get a quote and compare it against the cost of tools, safety gear, and your own time.
How Much Does It Cost to Install a Metal Roof?
Metal roof cost typically runs between $9 and $25 per square foot installed, depending on panel type, roof complexity, and region. That's a ballpark figure covering materials and labor; get a site-specific quote for accurate numbers.
How Long Does It Take to Install a Metal Roof?
A straightforward single-family roof usually takes a few days to about a week for an experienced crew, depending on roof size, pitch, and panel type. Complex rooflines with multiple valleys, dormers, or penetrations take longer.
What Is the Minimum Roof Pitch for Metal Roofing?
It depends on the panel profile and manufacturer. Exposed-fastener panels generally need a steeper minimum slope than standing seam systems, since standing seam's sealed, raised seams handle water at much lower pitches. Always confirm the exact minimum in your panel manufacturer's installation instructions before ordering.
This guide was reviewed by Jeffrey Wong, Senior Roofing Technician at Black Bear Home Exteriors (WA contractor license BLACKBH754MN), who has installed and inspected metal roofing systems across Southwest Washington. Questions about your specific roof? Contact our team for a free, no-pressure estimate.
