How Do You Screw Down Metal Roofing

November 30, 2025

2 min read

To screw down metal roofing, you need to use the right fasteners, place them in the right spots, and tighten them to the right pressure. Metal roofs are growing in popularity because they last 40 to 80 years, far longer than asphalt shingles. According to RubyHome, metal roofing costs between $10 and $17.05 per square foot for standing seam panels. Getting the screws right keeps your roof watertight and strong for decades. This guide shows you exactly how to do it.

What Screws Should You Use?

Metal roofing needs special fasteners called metal roofing screws. These screws have a rubber washer under the head that seals the hole. Regular screws will let water leak in and ruin your roof.

Use screws that are 1.5 to 2.5 inches long. They must go through the metal panel and bite into the wood below. The rubber washer is critical, so never use nails or regular wood screws.

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Where Do You Place the Screws?

Screw placement matters for both strength and preventing leaks. Place screws in the high ribs of the metal panels, never in the valleys. High ribs keep water away from the fastener holes.

Screw spacing is key. Space screws 24 inches apart along the ribs on the roof deck. For side laps where two panels overlap, place screws every 12 inches. This pattern keeps panels from moving in the wind.

How Tight Should Screws Be?

Tightness is everything. Too loose and water seeps in. Too tight and you crush the rubber washer, which also lets water in. Aim for firm and snug, like tightening a jar lid firmly but not with all your strength.

According to industry data, proper installation prevents water damage and extends roof life. Metal roofs can last 40 to 80 years when installed correctly. Use a drill with a torque-limiting attachment to avoid over tightening. The washer should just barely compress under the screw head.

Installation Steps Made Simple

Here are the basic steps:

Mark your screw locations with a pencil or marker
Use a power drill with a metal roofing screw bit
Drive each screw straight down, not at an angle
Stop when the washer compresses slightly
Check spacing every few panels
Inspect for any gaps or leaks before finishing

According to RubyHome, metal roofing installation costs range from $4 to $40 per square foot depending on the type and region. Proper screw installation is the foundation of a good roof job. Take your time with each fastener and check your work often. A correctly screwed metal roof will protect your home for 50 years or more.

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Talk with a local professional roofer to review your options and get a detailed estimate for your project.