You screw corrugated metal roofing at the peak of each corrugation or wave. This is the highest point where the metal rises up. You do not screw in the valley or low spot between waves. Screwing at the peak keeps water from pooling around the screw holes. Each screw should go through the metal and into the wood frame below. This creates a strong, watertight seal that keeps your roof safe from leaks and wind damage.
Why the Peak Matters
The corrugations on metal roofing are not flat. They have high points called peaks and low points called valleys. Water follows gravity and flows down the valleys naturally. If you place a screw in the valley, water will collect around it and cause rust and leaks over time.
Screwing at the peak keeps the fastener above the water line. According to RubyHome, corrugated metal roofing costs $5.50 to $11.50 per square foot when installed. You want your investment to last. Metal roofing can last 40 to 80 years, so proper installation is key to reaching that lifespan.
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How Many Screws Do You Need?
Space your screws about 12 to 18 inches apart on each peak. Use one screw per peak, going straight down into the wood frame. Do not use nails instead of screws. Screws hold better and resist wind damage much better than nails.
For a typical roof, you will need many fasteners. According to industry data, the average U.S. roof size is 2,647 square feet or about 26 squares. Using proper spacing and peak placement ensures your roof stays secure for decades. According to This Old House research, 5 million roofs are installed per year in the U.S., and most roofers use the peak-fastening method as standard practice.
Fastener Types and Tips
Use metal screws with rubber washers. The rubber washer sits under the screw head and creates a seal. This stops water from leaking through the screw hole.
| Fastener Type | Best Use | Why |
|---|---|---|
| Metal screws with washers | Corrugated metal | Prevents rust and leaks |
| Hex head screws | Heavy-duty jobs | Extra strength in wind |
| Wood screws | Not recommended | Strip easily in metal |
Common Mistakes to Avoid
Do not over-tighten screws. Over-tightening can bend the metal and crack the rubber washer. The screw should be snug but not super tight. Hand-tight plus a quarter turn is enough.
Never use screws in the valley between corrugations. Never use nails instead of screws. Never skip the rubber washer. According to RubyHome data, corrugated metal roofing costs can jump significantly when repairs are needed from improper installation. Proper placement saves money and keeps your roof dry.
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Talk with a local roofing contractor to review your options and get a detailed estimate for your project.