Choosing the right size nails for securing roof felt is a critical aspect of any roofing project. Roof felt, also known as roofing underlayment, serves as a protective barrier between the roof deck and the roofing material, helping to prevent leaks and enhance the roof’s longevity. In this article, we will provide a clear and concise guide on selecting the appropriate nail size for roof felt, whether you are a seasoned roofing professional or a DIY enthusiast.

Understanding the Basics

Before we dive into nail sizes, it’s essential to grasp the basics of what roof felt is and its purpose in roofing.

1. Roof Felt (Underlayment):
   Roof felt is a water-resistant material typically made from asphalt-saturated felt or synthetic materials. It is installed on the roof deck before the primary roofing material (such as shingles) to provide an extra layer of protection against moisture infiltration.

2. Securing Roof Felt:
   Roof felt is secured to the roof deck using roofing nails. These nails play a crucial role in ensuring the underlayment stays in place, especially in windy or adverse weather conditions.

Choosing the Right Nail Size

The nail size you select for securing roof felt is essential to prevent damage to the underlayment and maintain its integrity. Here’s what you need to consider:

1. Nail Length:
   Roofing nails used for securing roof felt are typically short, ranging from 1 to 1.5 inches in length. These nails are designed to penetrate the roof deck and hold the underlayment securely without piercing through it or causing damage.

2. Shank Type:
   Smooth-shank nails are commonly used for attaching roof felt. Their smooth surface allows for a secure hold without tearing the underlayment material.

3. Head Style:
   Roofing nails for underlayment often have large, flat heads to provide a broad contact area. This prevents the nails from pulling through the underlayment and ensures it remains firmly in place.

Installation Tips

When installing roof felt with the appropriate nails, follow these guidelines:

1. Spacing: Nail spacing is typically recommended by the manufacturer and can vary, but a common guideline is to space nails every 6 to 8 inches along the edges and every 12 to 24 inches in the field.

2. Overlapping: Overlap the underlayment sheets by a few inches to create a watertight barrier. Ensure that the nails penetrate through the overlap to secure both layers.

3. Avoid Over-Driving: Do not drive the nails too deep into the underlayment. The goal is to secure it, not puncture it.

4. Overlap Roof Felt and Flashings: Where roof felt meets flashings, make sure to secure them properly with nails to prevent water infiltration.

Conclusion

Selecting the right size nails for roof felt is a fundamental aspect of ensuring your roofing project’s success. Choosing the appropriate nail length, shank type, and head style is key to securing the underlayment effectively. By following manufacturer guidelines and installation tips, you can safeguard your roof against potential leaks and extend its lifespan. Whether you are a professional roofer or a homeowner embarking on a DIY project, this knowledge will help you make informed decisions when it comes to roofing underlayment.