Where to put screws on corrugated roofing depends on finding the high points of the waves. You should place screws at the peaks, not in the valleys. Screws go through the top of each wave where the metal is strongest. This stops water from pooling around the fastener. Getting screw placement right keeps your roof from leaking and damage. Corrugated metal roofing is growing in popularity, with metal roofing now holding 17% market share in residential roofing, according to the Metal Roofing Alliance (2024).
Why High Points Matter for Screws
The waves on corrugated roofing create natural peaks and valleys. Water runs down into the valleys naturally. If you put a screw in a valley, water pools around it. This creates a leak spot over time.
Placing screws at the peaks keeps them above water. The metal is also thicker and stronger at the peaks. Your screws hold better there and won’t back out as easily.
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Screw Spacing and Pattern
Screws should be 12 to 18 inches apart on corrugated roofing. Space them evenly in rows along each wave peak. Use a rubber washer under each screw head to seal it. The washer stops water from running down along the screw shaft.
Metal roofing can last 40 to 80 years, according to RubyHome (2025). Proper screw placement helps you get closer to that maximum lifespan. Poor placement cuts your roof’s life short.
Installation Basics
Use metal-to-metal self-drilling screws made for corrugated roofing. Do not use nails or wood screws. Drill or screw perpendicular, or straight down at 90 degrees. Tilted screws don’t seal well.
Avoid over-tightening. You just need snug enough to compress the washer. Over-tightening bends the metal and breaks the seal. According to industry data, proper installation can affect roof longevity significantly.
Quick Screw Placement Guide
| Placement | Why It Works |
|---|---|
| Peak of wave | Water sheds away, metal is thick |
| Valley | Water pools, creates leak spot |
| Side slopes | Water can run across, not ideal |
According to RubyHome (2025), corrugated metal roofing costs between $5.50 and $11.50 per square foot installed. Your investment is worth protecting with correct screw placement. Check your roof twice a year for loose screws or damage, according to industry maintenance recommendations. Fix loose fasteners right away to prevent bigger problems later.
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Connect with an experienced roof contractor to discuss your roofing needs and schedule an inspection.