The overlap on corrugated metal roofing refers to how much the sheets cover each other when installed side by side and end to end. Proper overlap is critical for keeping water out and making your roof last longer. Most corrugated metal roofing uses an overlap of 1.5 inches on the sides and 6 to 8 inches on the ends. Getting the overlap right prevents leaks and extends your roof’s life. According to industry data, metal roofing can last 40 to 80 years when installed correctly with proper overlap. This long lifespan makes metal roofing a smart choice for many homeowners.
Why Does Overlap Matter on Metal Roofing?
Water is your roof’s biggest enemy. Overlap creates a barrier that stops rain and snow from getting under the sheets. If overlap is too small, water sneaks in and causes damage. If overlap is too large, you waste money on extra material and make installation harder.
Metal roofing holds about 17% market share in residential roofing in the U.S., according to the Metal Roofing Alliance 2024. Many homeowners choose metal because it resists damage from storms and lasts decades.
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What Are the Standard Overlap Measurements?
Side overlap is the amount sheets cover each other from left to right. Most corrugated metal roofing uses 1.5 inches of side overlap. This is enough to shed water but not so much that you waste material.
End overlap is how much one sheet covers the sheet below it. End overlap is usually 6 to 8 inches. This large overlap is needed because water flows down the roof face. According to RubyHome 2025, corrugated metal roofing costs between $5.50 and $11.50 per square foot for installation. Proper overlap is built into this cost and ensures long-term performance.
| Overlap Type | Standard Measurement | Purpose |
|---|---|---|
| Side Overlap | 1.5 inches | Blocks water from side entry |
| End Overlap | 6 to 8 inches | Stops water flowing downward |
How Does Slope Affect Overlap Requirements?
Roof pitch or slope changes how water moves. A steep roof sheds water faster. A flat or low-slope roof keeps water longer. Steeper roofs may need less end overlap. Flat roofs need more overlap to push water away safely.
According to Rooflink 2025, asphalt shingles account for about 73% of U.S. residential roofing. Metal roofing is growing because of its durability and weather resistance. A steep metal roof with proper overlap can last 40 to 80 years or more. This long life means fewer repairs and better value over time.
What Happens If Overlap Is Wrong?
Too little overlap causes leaks. Water gets under the metal and finds its way into your attic and walls. Leaks create rot, mold, and expensive damage. According to industry data, 33% of homeowners replace roofs due to leaking.
Too much overlap wastes money and creates installation problems. Workers have to cut more metal and align sheets precisely. Getting overlap right the first time saves money and headaches later.
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Talk with a local roofing company to review your options and get a detailed estimate for your project.