Metal roofing lasts up to 70 years, requires less maintenance, and is energy-efficient compared to asphalt. However, an incompetent installation can lead to leaks, corrosion, and voided warranties. This guide will walk you through the steps of how to install metal roofing successfully. We'll cover everything from preparation and safety to common mistakes and maintenance.
Key Tools and Materials Needed to Install Metal Roofing
Below is a list of tools and materials you may require for your DIY roofing project. The type and amount of metal panels, flashing, fasteners, sealants, and underlayment will depend heavily on your roof's size, shape, pitch, and chosen metal type.
Essential Considerations:
- Roof Design Complexity: Simpler roof designs require fewer materials compared to complex designs with multiple hips, valleys, or skylights.
- Metal Panel Type: Different metal panel profiles (standing seam, corrugated, etc.) require specific trims, fasteners, and underlayment materials for proper installation.
Tools Required:
- Hammer
- Utility knife
- Tape measure
- Chalk line
- Aviation snips or metal shears
- Drill/driver
- Fall protection gear (safety harness)
Materials Required:
- Metal Roofing Panels: Panels come in steel, aluminum, copper, and zinc with various coatings. Steel and aluminum are affordable and durable. Copper develops a patina, while zinc looks like slate or cedar shakes.
- Ice and Water Shield: This membrane is installed under the metal panels to protect against water infiltration, particularly in areas prone to ice dams and heavy rainfall.
- Roofing Nails: Used to secure the metal panels, trim, and flashing to the roof deck.
- Eave Trim: Installed along the roof's eaves, this trim provides a finished edge and helps direct water away from the roof structure.
- Gable Trim: Similar to eave trim, gable trim is installed along the gable ends of the roof to provide a finished look and protect against water intrusion.
- Ridge Cap: The ridge cap seals the gap between the metal panels and provides additional weather protection.
- Sidewall Flashing: Used to seal the junction between the metal roof and vertical surfaces, such as walls or chimneys, preventing water from seeping into the structure.
- Self-Tapping Roofing Screws: These specialized screws are designed to install metal roofing and are self-drilling, making installation easier and more efficient.
- Metal Roofing Sealant: Applied to seams, fasteners, and other vulnerable areas, sealant helps create a watertight barrier and prevents leaks.
- Inside Foam Closure Strips: Placed between the metal panels and the roof deck, these strips prevent insects, debris, and moisture from entering the roof space.
- Outside Foam Closure Strips: Installed along the roof's edges to seal gaps and provide a finished appearance.
- Butyl Tape: Used to seal joints and seams in metal roofing components, butyl tape provides additional waterproofing and weather resistance.
- Roofing Vent Boots: These boots are installed around vent pipes and other roof penetrations to prevent water infiltration while allowing for ventilation.
Pre-Installation Preparation
- First, calculate roofing squares to determine how many metal roofing panels and accessories you need. Allow for overlap and trim. Use our guide here to learn how to calculate roofing squares.
- Next, inspect your roof deck and make necessary repairs before installing the new roof.
- Order the panels early in your preparation process so that they’ve already arrived when you’re ready to install!
How to Install Metal Roofing in 8 Steps
This guide will show you how to install metal roofing on a typical gable roof. This installation is simpler and requires fewer accessories than more intricate roofs.
Materials Required:
- Underlayment (self-healing ice and water membrane)
- Metal Panels
- Roofing screws
- Eave trim
- Gable trim
- Butyl tape
- Outside closures with tape mastic
- Ridge cap
- Sealant
1. Prepare the Roof Deck
To install metal roofing, ensure your roof deck is in good shape. Any rotted wood or damaged areas need to be repaired or replaced. The roof deck must also be smooth and level so the panels lie flat. If there are dips or bumps, the panels won't seal properly, allowing leaks over time.
2. Apply Underlayment
Begin by applying the underlayment on top of the sheathing to protect it. Opt for a self-healing ice and water membrane for enhanced durability. Apply the underlayment without wrinkles by carefully unrolling it across the roof. Overlap the previous layer by 6 to 8 inches and cut it once rolled out.
3. Establish Square Reference Line
Ensure accuracy by establishing a square reference line perpendicular to the eave. Utilize the 3:4:5 method to create a square reference line. Snap the line to provide a guide for precise installation. Install the eave trim.
4. Install Metal Panels
With the eave trim securely in place, install the metal panels. Each panel has a shorter rib leg that doesn't touch the roof surface. Overlap the last rib on each panel to ensure a seamless fit. Secure the panels with roofing screws, working in rows no more than two feet apart.
5. Attach Gable Trim
Install the gable trim to tidy up the panel edges and prevent water infiltration. Ensure the trim is securely fastened to the roof deck. Bend the end of the trim to meet the corner of the eave.
6. Apply Butyl Tape and Drive Screws
Apply butyl tape on the underside of the trim where it meets the roof panels. Drive screws over the butyl tape every 12 inches to secure the trim in place.
7. Adhere to Outside Closures for Ridge Cap
Adhere a line of outside closures with tape mastic about 4 inches from the top of the peak. This provides a secure base for fastening the ridge cap to the roof.
8. Install Ridge Cap:
Apply sealant to the foam closure and fit the ridge cap on the peak. Fasten the ridge cap with 2-inch screws to the roof deck through every rib. Ensure the ridge cap is securely attached to complete the installation process.
Safety Tips
It’s important to know how to install metal roofing safely. The process can be dangerous, especially when working on steep roofs. Always wear rubber-soled shoes for traction, and consider using roof brackets for extra safety. Never install metal roofing in high winds or storms. Have someone spot you when working up high in case you lose balance or footing. Take your time and be extremely cautious to avoid injury.
Maintenance of Your Metal Roof
Keep the following tips in mind to help your metal roof stay in great condition.
- Perform Inspections: After major storms, conduct thorough inspections of your metal roof. Look for dents, scratches, or rust spots and address them promptly to prevent further damage.
- Clean Your Metal Roof: Use a specialized metal roof cleaner before pressure washing, especially for tough stains. Watch for streaking and staining from algae or debris in humid areas.
- Avoid Walking on the Roof: To prevent dents and damage, minimize walking on the roof. Walk only in secure areas, wearing rubber-soled shoes for grip, and never on a wet or icy roof.
- Ensure Regular Maintenance: Regular checks and cleaning maintain appearance and durability, prolonging lifespan and providing long-term protection.
Drawbacks of DIY Metal Roof Installation: What You Need to Know
Warranty Issues
Many metal roof manufacturers void warranties if the roof is not installed by a certified professional.
Safety Hazards
Keep the following potential safety hazards in mind when considering installing a metal roof yourself.
- Working at Heights: Metal roof installation requires working at significant heights, which increases the risk of falls and serious injuries. Proper safety equipment and experience are crucial.
- Sharp Metal Edges: Metal roofing panels have sharp edges that can cause cuts and lacerations if not handled carefully.
Improper Installation
Metal roof installation involves precise measurements, cutting techniques, and proper fastening methods. Mistakes can lead to leaks, wind damage, and reduced roof lifespan.
Installing metal roofs often requires specialized tools you might not already own, adding to the project cost.
Improper installation can violate local building codes, potentially leading to fines and the need for professional redoing.
Material Waste
Incorrect measurements or cutting errors can lead to wasted metal panels, increasing the overall project cost. Professional roofers often have established relationships with material suppliers and can negotiate better prices than individual homeowners.
Long-Term Problems
Some potential drawbacks to installing your own metal roofing may not be apparent right away:
- Hidden Damage: An inexperienced installer might miss underlying structural issues or improperly install flashing, leading to problems that may not be apparent for years.
- Difficult Repairs: Even minor repairs on a metal roof can be challenging for someone without experience. You might end up needing to hire a professional anyway.
How to Install Metal Roofing Like a Pro:
- Check the warranty terms: Always read the fine print of the metal roof warranty before purchasing. It will explicitly state the coverage requirements, including professional installation.
- Consider the risks of DIY: While DIY can save money upfront, the potential consequences of an improperly installed roof are significant. This could include leaks, structural damage, and voiding the warranty, leaving you with no recourse if issues arise.
- Hire a licensed roofing contractor: Although it might seem like a higher initial cost, hiring a qualified roofing contractor ensures a professional installation that meets manufacturer specifications and maximizes the chances of your metal roof lasting its intended lifespan and being covered under warranty if necessary.
Find a Skilled Roofer on Directorii to Install Metal Roofing
We recommend hiring a professional roofing contractor to install metal roofing to ensure its longevity and avoid problems with installation, maintenance, and warranty. Directorii is a trusted platform that lists only licensed and vetted roofing professionals near you. Begin your search today and get a $20,000 guarantee.
