Metal roofs are gaining popularity for good reason – they’re durable, energy-efficient, and can last 50+ years with proper installation.
But that last part is crucial.
A DIY metal roof installation can save you thousands, though mistakes can lead to headaches and costly repairs down the road.
We’ll break down the process into manageable steps that even first-time roofers can follow. Let’s get your new metal roof installed right the first time.
Key Notes
- Plan and measure first to prevent waste and errors during installation.
- Always wear safety gear and work with a helper when needed.
- Ensure panels are secured tightly to prevent any gaps that might let water in.
- Proper underlayment and flashing are essential for weatherproofing your roof.
Step 1: Prioritize Safety
Metal roofing installation involves working at heights and handling heavy materials.
Before you even think about how to install metal roofing panels, make sure you’ve got the right safety gear.
Safety Gear
You’ll need a harness or rope if you’re working on a steep slope, non-slip roofing shoes for better grip, and gloves to protect your hands.
Safety goggles are important to protect your eyes from dust and flying debris.
Stable Working Conditions
Ensure your ladder is properly positioned and secure.
If you’re working in high winds or rain, it’s best to reschedule. Metal roofing is slippery when wet, so avoid working in poor weather conditions.
Step 2: Measure and Prepare Your Roof
Accurate measurements are an important step to a successful metal roof installation.
If you’ve ever wondered how to install metal roofing over plywood or shingles, it all starts with knowing your dimensions:
Measuring Your Roof
You’ll need to measure the length, width, and pitch of your roof. This is important because it determines how much material you’ll need.
Don’t forget to account for overlaps between panels and waste material.
Roof Deck Preparation
Before proceeding, inspect the roof deck. If you’re working with an existing roof, check for any damage.
For a metal roof installation over shingles, it’s often best to install a new layer of plywood if the existing deck is in bad condition.
Otherwise, you can install metal roofing directly over shingles with proper underlayment.
Materials
Once measurements are taken, order enough metal panels, underlayment, flashing, and fasteners for your roof.
Make sure the materials are rated for your climate, especially if you’re installing metal roofing on a flat roof or shed.
Step 3: Install Underlayment and Flashing
Before you start placing metal panels, you need to install a solid underlayment to protect the decking from moisture and heat.
Flashing protects areas where the roof meets walls, chimneys, and other projections.
Underlayment
Roll out the underlayment starting from the eaves and work upward. Overlap each row by 4–6 inches.
Use roofing nails to secure the underlayment to the roof deck, but don’t overdo it—leave some room for expansion.
Flashing Installation
Next, install flashing at roof penetrations like chimneys, vents, and skylights. Flashing prevents water from getting under your metal roof. Install it securely with metal roofing sealant.
Step 4: Position and Secure Metal Panels
Now that your roof is prepped, it’s time to start installing the metal roofing panels. This is where it all comes together.
Positioning Panels
Start at one edge of the roof, aligning the first panel with the eaves. You’ll want to leave about an inch overhang at the edge of the roof to allow for water runoff.
Make sure the first panel is straight and level before moving forward.
Install Metal Roofing Screws
Fasten the panels with metal roofing screws, placing them in the raised ribs of the panels. This helps prevent water from seeping through the screw holes.
Tighten them securely, but avoid overtightening—this can cause the metal to warp.
Overlap Panels
Each new panel should overlap the previous one by at least one inch. This overlap ensures that the roof is sealed and provides added protection from the elements.
Continue securing panels across the roof, checking that each panel is lined up straight.
Step 5: Install Ridge Cap & Final Pieces
Once the panels are installed, the last thing to do is secure the ridge cap and check your work.
Ridge Cap Installation
Place the ridge cap along the top edge of the roof, where the two slopes meet. This cap covers the seams and prevents water from getting under the roof panels.
Attach the ridge cap with roofing screws and seal the edges to prevent leaks.
Final Inspection
Take a step back and inspect the roof thoroughly. Check for any loose panels, gaps, or exposed screw holes. It’s better to catch small issues now rather than later.
Frequently Asked Questions
What do you put down before a metal roof?
Before installing a metal roof, you need to put down underlayment. This layer helps prevent moisture buildup and adds insulation. In some cases, flashing will also be necessary around roof penetrations to ensure a watertight seal.
How do I install metal roofing over shingles?
When installing metal roofing over shingles, the first step is to ensure the shingles are in good condition. If they’re too worn, remove them. After that, lay down an underlayment and install the metal roofing as you would on a clean deck.
What is the biggest problem with metal roofs?
The biggest issue with metal roofs is poor installation. If the panels aren’t properly secured or overlapped, leaks can develop. Additionally, metal roofs can be noisy during storms if there is no adequate insulation beneath them.
Conclusion
Installing a metal roof is a significant project that pays off in durability and energy savings—but only when done right.
The difference between a 50-year roof and a headache often comes down to careful measurement, proper underlayment, and secure fastening techniques.
Even if you’re handy with tools, remember that roofing has its unique challenges. Take your time with each step, double-check your work, and don’t cut corners on materials. If you start feeling overwhelmed during the planning phase, that’s a good indicator that professional installation might be worth the investment.
Not everyone has the time, tools or expertise for a DIY metal roof project. We bring years of experience to every job, ensuring your new roof is installed correctly from day one.
Contact us today for a free, no-obligation quote and let our team handle the heavy lifting while you enjoy the lasting benefits of a quality metal roof.