How to Install Metal Roofing
A metal roof starts with a sound roof deck and ends with careful work at every edge, seam, and opening. The panels get most of the attention, but the layers underneath and the way everything fits together determine how well the roof protects your home.
If you’re researching how to install metal roofing before replacing your shingles, understanding the process gives you better questions to ask your contractor. It also makes it easier to compare estimates and see what goes into the finished work. Here’s what to expect, how different panels affect installation, and what to consider before taking on the job yourself.
Choosing Your Roofing Panels
Your panel choice sets the installation requirements. Fasteners, trim, and roof slope requirements vary between systems, so these decisions belong at the beginning of the project. Our metal roofing options at Better Roof Metal Works include:
Post-Rib Panels
An exposed-fastener option made from 29-gauge steel, with 36-inch coverage and ribs spaced every 9 inches. Screws pass through the panel face. These panels offer a lower initial cost, with fasteners and sealing washers requiring attention over time.
1-Inch Snap-Lock Standing Seam
A concealed-fastener option made from 26-gauge steel, with 16-inch panel coverage. Adjacent panels snap together, hiding the fastening flange beneath the next panel. The result is a clean roof surface with fewer exposed fastening points.
You can see the snap lock profile on our rustic red metal roofing project in Hamilton. The raised seams create the vertical lines visible across the roof. Neither panel choice removes the need for proper preparation or flashing. The system must suit your roof’s shape and slope, with fastening details appropriate for the structure.
How to Install Metal Roofing Step by Step
The following stages describe a typical residential replacement. Some work overlaps, especially around flashing. Your installer follows the selected system’s details to determine the exact sequence.
1. Assess and Measure the Roof
Installation planning starts with the building. Your contractor measures each roof section and checks the pitch, or slope, to confirm that the proposed panel is suitable.
A simple gable roof presents different demands than a roof with dormers, several valleys, or changes in pitch. Those features affect panel layout and the amount of flashing needed. Measurements must account for the panel’s usable coverage and how its ends connect to the trim.
Before work begins, ask what the estimate includes. Old-roof removal, disposal, and possible decking replacement should be clear so you understand how unexpected damage will be handled.
2. Remove the Existing Roofing
Better Roof Metal Works typically removes existing shingles before installing the new metal roofing system. This exposes the decking so its condition can be checked directly.
Removing the old shingles exposes the wood decking underneath. Your installer checks for rot or damage and replaces any weak sections before the new roofing goes on.
The crew also plans how much roof to open at once and how to protect exposed areas if the weather changes. That matters when your home remains occupied during the replacement.
3. Install Compatible Underlayment
Underlayment creates a secondary weather barrier between the decking and the metal panels. Its purpose is to help manage water that reaches beneath the roof covering.
The product must be compatible with metal roofing and its operating temperatures. Depending on the assembly, the installation may combine synthetic underlayment with a self-adhering membrane at vulnerable areas such as eaves and valleys. High-temperature ratings matter when selecting a self-adhering product for use beneath metal.
Your installer follows the product instructions for fastening and laps. Those layers must connect properly to the edge trim and flashing so that water has a path outward.
4. Prepare Roof Edges and Valleys
Eave trim directs water off the lower edge of the roof. Valley flashing handles runoff where two roof slopes meet. These components need to be integrated with the underlayment and panels in the correct order.
Some standing seam details use a cleat, a metal attachment strip that holds the folded lower edge of the panel. Other systems use a specified overhang and fastening arrangement.
The goal is controlled drainage and a secure connection. Copying an overhang measurement from another panel system can cause problems, even when both roofs look similar from the ground.
5. Lay Out and Fit the Panels
The first panel establishes alignment for the rest of the roof. Installers check that it sits square to the eave and use layout marks to keep subsequent panels on course.
Panels are fitted around roof features as work progresses. Cutting tools must suit the material and protect its finish. Snips, electric shears, or nibblers may be used, depending on the cut and the manufacturer’s guidance. Heat-producing cutting methods can damage protective coatings.
Metal shavings need to be removed promptly. Left on the surface, they can rust and stain the finished roof. Careful handling also prevents scratches and bent edges before the panels are secured.
6. Fasten and Connect the Panels
This stage varies significantly between exposed-fastener and standing-seam roofing. With exposed-fastener panels, the installer uses the specified screws and sealing washers. Screws must seat correctly without crushing the washer or leaving it loose. Fastener placement and spacing come from the panel instructions and project requirements.
With standing seam, fastening may use concealed clips or an integral fastening flange. Our snap lock profile uses slotted screw holes to accommodate expansion and contraction. The fastening arrangement needs to preserve that movement as Montana temperatures change. Adjacent panels are joined according to the system’s seam or overlap detail. Adding extra screws wherever convenient can interfere with performance, particularly when they restrict movement.
7. Complete Flashing and Ridge Details
Flashing directs water around openings and junctions, including chimneys and places where the roof meets a wall. It is installed as the surrounding work progresses, with each component positioned to shed water onto the appropriate surface.
At the roof peak, the ridge cap works with the required closures or vent components to finish the assembly. A vented ridge must be part of a ventilation design suited to the home.
These details deserve close attention during installation. A neat bead of sealant cannot make up for flashing that allows water to run behind the roof covering.
8. Inspect the Finished Work
The final inspection checks panel connections, fasteners, and trim. The crew removes cutting debris and checks the roof surface for damage. Cleanup should also include the ground around the home.
Before the project closes, ask your contractor to explain maintenance expectations and provide the applicable warranty information. Understand which terms cover materials and which cover installation workmanship.
Plan for Montana Winters
Snow and ice should be part of the installation conversation before the roof goes on. Metal can shed snow, so the areas beneath roof slopes matter. Discuss whether snow retention is needed above entrances, walkways, or other places where sliding snow could cause harm.
Ice dams require a separate look at the home. Heat escaping from the interior can melt snow that later refreezes at colder roof edges. Air sealing and adequate insulation address that heat loss; ventilation must suit the roof assembly. Replacing the roof covering alone does not correct those underlying conditions.
For homes in the Bitterroot Valley and Missoula area, winter planning belongs alongside panel selection. Ask how your roof layout and existing insulation affect the proposed work.
Can You Install Metal Roofing Yourself?
DIY installation may be an option for someone with roofing experience working on a simple structure. A small roof with few openings is easier to plan than a house with steep slopes, chimneys, and multiple valleys.
Before choosing DIY, make sure you can:
- Follow the exact panel manufacturer’s installation instructions.
- Provide safe access and suitable fall protection.
- Handle long panels without bending them or losing control in wind.
- Cut and fit trim without damaging the panel finish.
- Keep the building protected throughout the work.
The equipment goes beyond a drill and ladder. Depending on the system, you may need metal-cutting tools, hemming tools, and specialized seam equipment. Include those costs, disposal, and your time when comparing DIY with a contractor’s estimate.
For a residential replacement, hiring an experienced metal roofing installer is often the practical choice. The work includes assessing the deck and resolving roof transitions, with your home relying on those details every day.
Metal Roofing Installation FAQs
We don’t recommend installing metal roofing over shingles. The only exception we would consider is an exposed-fastener system. In that case, we install 1x4 strapping over the shingles and fasten the metal panels to the strapping.
Use the fastening locations specified for your panel and substrate. Exposed-fastener panels and standing seam systems use different arrangements. There is no single screw pattern that applies to every metal roof.
Residential metal roofing over a solid deck generally uses compatible underlayment as part of the assembly. The required product and coverage depend on the system and applicable requirements. Underlayment supports moisture protection but does not replace correct panel installation and flashing.
The timeline depends on roof size, complexity, and weather. Removing old roofing or replacing damaged decking adds work. Ask for an estimate based on your roof and clarify how unexpected damage or weather delays could affect the schedule.
Discuss Your Roof with Us Today
Better Roof Metal Works installs metal roofing for homeowners in the Bitterroot Valley and Missoula area. We start by measuring your roof and reviewing the options that make sense for your home. If you’re ready to replace your shingles, schedule an estimate. We’ll talk through panel choices and the work your roof needs before installation begins.