Why Every Roofing Contractor Should Nail It Right: The Key to Asphalt Shingle Success

When it comes to protecting your home, few components are as critical as your roof. And while asphalt shingles remain one of the most trusted roofing materials in the industry, even the best shingles can fail if installed incorrectly. One overlooked—but incredibly important—factor in roof performance is proper nail placement.

Whether you’re a homeowner evaluating a new roof or a roofing contractor looking to maintain your reputation, understanding nail placement is essential. Let's break down why this small detail makes a big difference.

Why Nail Placement Matters

Each asphalt shingle has a designated nailing zone—commonly known as the “nail line” or “nailing strip.” This area is specifically engineered by manufacturers to align with both the current and overlapping shingles. When nails are driven into this zone properly, they secure two layers of shingles simultaneously, enhancing both wind resistance and structural integrity.

Incorrect nail placement doesn’t just affect individual shingles—it compromises the performance of the entire roofing system.

Common Nailing Mistakes and Their Consequences

Below are the most common nail placement errors and what they can mean for your roof:

1. High Nailing (Above the Nail Line)

Nailing too high can result in missed underlying layers, weakening the hold and increasing the chance of shingles lifting or blowing off in strong winds.

2. Low Nailing (Below the Nail Line)

Placing nails too low exposes them directly to the weather. This can lead to nail rust, water penetration, and cracked shingles—opening the door to costly roof leaks.

3. Overdriven Nails

High-pressure nail guns may drive nails too deep, cutting through the shingle material and reducing its wind resistance. These shingles are more likely to detach under stress.

4. Underdriven Nails

When nails aren’t driven flush with the surface, shingles may not lay flat. This can allow wind-driven rain to seep underneath and cause interior damage.

5. Angled Nails

Nails should always be driven straight. Angled nails don’t distribute pressure evenly and may eventually back out, leaving vulnerable gaps in your roof system.

How Many Nails Are Required per Shingle?

Most manufacturers recommend using four nails per standard asphalt shingle. However, in high-wind zones or with specific roofing products, six nails may be required to meet warranty and wind-resistance specifications.

Using fewer nails than recommended not only voids warranties but also severely reduces the durability of your roof.

What to Look for During Roof Installation

If you’re a homeowner working with a roofing contractor, here are some smart steps to ensure proper installation:

• Ask the contractor about their nailing process and quality control measures.

• Discuss wind zone requirements and whether extra nails are necessary for your area.

• Request to inspect a small section of completed shingles before the full installation continues.

• Confirm that corrosion-resistant nails (such as galvanized steel) are being used to prevent rust and long-term deterioration.

Can Improper Nailing Be Fixed?

In some cases, yes. If detected early, a roofing contractor can remove and replace poorly nailed shingles or refasten them correctly. However, widespread issues may require more extensive repair—or even a partial tear-off and reinstallation—to ensure the roof performs as it should.

The Bottom Line: Nail Placement Is Not Optional

Your roof is only as strong as its installation. Even premium asphalt shingles won’t stand up to wind, rain, and time if they’re not fastened properly. Nail placement may seem like a small part of the process, but it’s one of the most important details a roofing contractor must get right.

Correct installation is your best defense against wind damage, premature wear, and expensive roof leaks down the road. If you’re planning a new roof or replacing an old one, don’t hesitate to ask questions and stay involved—your home deserves a job well done.