How to Install Metal Roofing: A Step-by-Step Guide

Preparing for Metal Roof Installation

Before you even lift a tool, preparation is critical. A well-prepared roof deck ensures your new metal roof performs at its best.

1. Inspect the Roof Structure

• • Look for rot, water damage, or sagging areas.
    
    
  • Reinforce or replace weak sections of decking.

2. Gather the Right Tools & Materials

Materials you’ll need include:

• Metal roofing panels (corrugated, standing seam, or another style of your choice)

   

• Underlayment (synthetic or felt for added protection)

   

• Drip edge flashing for the eaves and rakes

   

• Ridge caps to finish off the roof peak

   

• Closure strips and roofing sealant

   

• Screws with rubber washers to secure the panels and prevent leaks

  
  
  

Tools and safety gear to prepare:

• A drill or screw gun with the correct bits

   

• Metal shears or tin snips for cutting panels

   

• A circular saw with a metal cutting blade (for larger cuts)

   

• Measuring tape and a chalk line for accuracy

   

• A safety harness, ladder, gloves, and non-slip boots

   

• Protective glasses to shield your eyes while cutting and drilling

3. Check Building Codes & Permits
Local regulations may dictate what type of roof you can install. Professional companies like Capital City Roofing can help you navigate these requirements easily.

Step-by-Step: How to Install Metal Roofing

Here’s a detailed breakdown of the general installation process. Keep in mind that specific instructions may vary depending on your roof design, the type of panels you choose, and the manufacturer’s guidelines.

1. Remove Old Roofing (If Needed)

While it’s possible in some cases to install metal roofing over existing shingles, removing the old material is strongly recommended. Taking off the old roof allows you to:

• Identify hidden damage such as rotting wood, mold, or structural weakness.

   

• Ensure the new panels sit flat and secure.

   

• Prevent unnecessary weight on your roof structure, which could cause sagging.

   

Tip: If you’re doing this step yourself, rent a roofing tear-off shovel for efficiency and always wear heavy-duty gloves. Dispose of old materials properly to avoid sharp debris hazards.

2. Install Underlayment

The underlayment serves as a moisture barrier and provides an added layer of protection. To install:

• Start at the bottom edge of the roof and roll out the underlayment horizontally, working upward.

   

• Overlap each row by at least 4–6 inches to prevent water infiltration.

   

• Secure the material using nails, staples, or cap fasteners.

   

• In colder climates, apply an ice and water shield along eaves and valleys to guard against ice dams.

   

Pro tip: Use a synthetic underlayment rather than felt for improved durability, tear resistance, and longevity.

3. Attach Drip Edge & Flashing

Drip edges and flashing are essential for water control and leak prevention.

• Install the drip edge along the eaves first, then along the gable edges. This metal trim directs water away from the fascia and reduces the risk of rot.

   

• Add flashing around areas where water intrusion is common — such as chimneys, skylights, and valleys.

   

• Ensure each piece of flashing overlaps the one below it for a watertight seal.

   

Mistake to avoid: Skipping flashing or installing it incorrectly is one of the leading causes of roof leaks. Take extra time with this step.

4. Position the First Panel

Accuracy in the first panel sets the tone for the entire roof.

• Snap a chalk line at the eave to ensure perfectly straight alignment.

   

• Place the first panel so that it overhangs the edge by about 1–2 inches. This small overhang allows proper water runoff into gutters.

   

• Confirm that the panel is square to the roof edge before securing it.

If the first panel is misaligned, every subsequent panel will also be off — so double-check measurements before proceeding.

5. Secure Panels

Once the first panel is in position, fastening begins.

• Use roofing screws with rubber washers to secure panels. The washer compresses against the panel to prevent leaks.

   

• Space screws about 18–24 inches apart, and make sure each fastener is perpendicular to the panel.

   

• Avoid overtightening. Crushing the washer reduces its ability to seal and can damage the panel’s finish.

   

Safety tip: Always walk on the panels carefully, stepping only on flat areas or directly above support beams to avoid dents.

6. Overlap & Seal

Proper overlapping is crucial for waterproofing and wind resistance.

• Overlap each new panel with the one before it according to manufacturer recommendations (usually one rib or specified dimension).

   

• Apply butyl tape or sealant between laps to create a watertight seal.

   

• Install closure strips where panels meet ridges, eaves, or sidewalls to keep out water, wind, and pests.

   

This step is where attention to detail pays off — gaps or poorly sealed overlaps are often the first areas to leak.

7. Finish With Ridge Caps

The ridge cap is the finishing touch that protects the roof peak.

• Place foam closure strips along the ridge to fill gaps and allow for proper ventilation.

   

• Lay the ridge cap over the peak, making sure it covers both sides evenly.

   

• Secure with screws, ensuring overlaps between ridge cap pieces are properly sealed.

   

Well-installed ridge caps not only provide weather protection but also give the roof a clean, professional look.

8. Final Inspection

Once installation is complete, don’t rush to pack up. A final check is vital.

• Inspect every row of panels to confirm screws are snug and aligned.

   

• Check flashing and sealant for gaps or weak spots.

   

• Sweep or blow off all metal shavings — if left behind, they can rust and cause surface damage.

   

• Test water runoff with a garden hose to ensure the roof sheds water efficiently.

   

Only after a thorough inspection should you consider the job finished.

Should You Install a Metal Roof Yourself?

The biggest question homeowners face is whether to attempt the job themselves or call in a professional crew.

Advantages of DIY Installation

• Labor Savings: Skipping labor costs can reduce your project budget significantly.

   

• Personal Satisfaction: For skilled DIYers, completing a roofing project is rewarding.

   

• Flexibility: You set your own timeline and control every detail.

   

Drawbacks of DIY Installation

• Safety Risks: Roofing is among the most dangerous home improvement projects. Falls, sharp edges, and heavy panels are real hazards.

   

• Technical Challenges: Proper flashing and sealing require skill; mistakes can lead to leaks and costly damage.

   

• Warranty Limitations: Many manufacturers void warranties if the roof is not installed by certified contractors.

   

• Time Investment: What takes professionals a few days might take a DIYer weeks.

   

When to Call Capital City Roofing

Hiring experts like Capital City Roofing makes sense if:

• Your roof has a steep pitch or multiple dormers.

   

• You lack the tools or safety equipment.

   

• You want to ensure warranty protection.

   

• You value professional speed and precision.

   

Common Mistakes to Avoid When Installing Metal Roofing

Even skilled homeowners can make costly errors. Watch out for these pitfalls:

• Improper Fastener Placement: Too close to panel edges or overtightened screws can cause leaks.

   

• Skipping Underlayment: It may seem optional, but underlayment adds crucial moisture protection.

   

• Ignoring Ventilation: Poor ventilation leads to condensation and mold issues.

   

• Neglecting Flashing Details: Weak spots around chimneys, vents, and valleys are the most common sources of leaks.

   

• Forgetting Maintenance: A metal roof still requires occasional inspection and cleaning.

   

Maintenance Tips for a Long-Lasting Metal Roof

Once installed, metal roofs are low-maintenance — but not maintenance-free.

• Inspect Twice a Year: Look for loose fasteners, damaged flashing, or worn sealant.

   

• Clean Gutters & Debris: Leaves and branches can trap moisture and scratch panel finishes.

   

• Wash the Roof Surface: Mild soap and water remove dirt and algae buildup.

   

• Trim Nearby Trees: Prevent scratches and reduce debris accumulation.

   

• Recoat When Needed: Protective coatings may need renewal after decades to maintain energy efficiency and prevent rust.

   

Frequently Asked Questions About Installing Metal Roofing