How To Fasten Corrugated Plastic Roofing

November 30, 2025

2 min read

To fasten corrugated plastic roofing, you need fasteners that go through the top of each wave, sealant tape, and a drill or screwdriver. Corrugated plastic is light and easy to work with, but fastening it wrong can cause leaks and damage. This guide shows you the right way to secure your corrugated plastic roof so it stays tight and dry for years to come.

What Fasteners Do You Need?

The best fasteners for corrugated plastic roofing are self-tapping screws with rubber washers. These screws bite into the plastic without pre-drilling. The rubber washer seals around the screw hole to stop water from leaking in. Buy screws that are 1.5 to 2 inches long.

Avoid using nails on corrugated plastic roofing. Nails can split the plastic and create gaps where water sneaks through. Roofing contractors know that proper fastening prevents costly repairs later. According to industry data, improper fastening is a common cause of roof leaks, which accounts for 33% of all roof replacements in the U.S.

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Where Should Fasteners Go?

Always fasten corrugated plastic at the top of each wave, not in the valley. The wave is the raised part that runs down the length of each sheet. Fastening at the top gives the screw better grip and keeps the plastic from flexing too much.

Space your fasteners about 12 inches apart along each wave. Use this pattern for all rows across your roof. According to RubyHome data, the cost of roof installation ranges from $4 to $40 per square foot, and poor fastening can double your repair costs within a few years.

Step-by-step Fastening Process

First, lay your sealant tape under the fastener area to seal the hole. Position your sheet in place and mark where fasteners go with a marker. Drill pilot holes if your plastic is thick, or use self-tapping screws directly on thinner sheets.

Drive each screw slowly and stop when the rubber washer is snug against the plastic. Do not over-tighten. Over-tightening cracks the plastic and squeezes out the sealant. According to This Old House data, proper installation by trained roofers prevents 90% of weather-related damage.

Fastener Type	Best Use	Length
Self-tapping screws with washers	Corrugated plastic	1.5 to 2 inches
Nails	Not recommended	N/A
Bolts with sealant	Extra-heavy duty	Varies

Common Mistakes to Avoid

Do not fasten in the valley. Fastening in the valley puts stress on a weak spot and causes cracking. Never skip the rubber washer. The washer is what stops water from leaking through the hole.

Over-tightening is the most common error homeowners make. It crushes the plastic and ruins the seal. According to ConsumerAffairs data, 88% of contractors express concern about extreme heat hazards that can expand plastic roofing and loosen fasteners, so check your fasteners yearly in hot climates.

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Work with a professional roofing contractor to protect your property with quality roofing solutions.