What Is Racking of Shingles?
Racking refers to the installation method where shingles are laid straight up the roof rather than using the traditional stair step method. While this technique can be used in certain situations, it comes with specific considerations and potential drawbacks.
Does GAF Approve of the Racking Method?
For Three Tab Shingles, the racking method is acceptable but not preferred due to potential installation problems and damage if not done correctly.
For Laminated or Designer Shingles, the racking method is not acceptable. Following the application method and specific offsets shown in the instructions for each type of shingle is essential to achieve the best appearance, wind performance, and to avoid damage from over-bending the shingles.
Possible Types of Installation Problems and Damages
- Improper Nailing:
- Racking can lead to improper nailing, particularly with the last (blind) nail of every other course of shingles. This can result in reduced wind resistance if shingles are left un-nailed.
- Stress Cracks:
- Bending shingles to install the blind nail can cause stress cracks, which may not be immediately visible but can lead to premature shingle failure.
- Incorrect Color Blends:
- Installing shingles straight up can create visible up and down color lines on the roof, resulting in unattractive shading.
Best Practices for Racking Three Tab Shingles
If you choose to rack three tab shingles, follow these best practices:
- Ensure Proper Nailing:
- Make sure the correct number of nails is installed in each shingle to maintain wind resistance and avoid unattractive patterns.
- Monitor Color Blends:
- Pay attention to color blending to avoid racking lines. Mix shingles from 2 or 3 bundles during installation to minimize color patterning.
- Avoid Over-Bending:
- Be careful not to over-bend shingles when installing the blind nail, especially in lower ambient temperatures, as this can cause damage.
Impact on Warranty
Using the racking method does not void the GAF Limited Warranty against manufacturing defects. However, the warranty does not cover failure to seal, blow-off, or wind damage if shingles are not installed according to GAF’s current application instructions.
Conclusion
While the racking method can be used for three tab shingles, it is crucial to follow best practices to avoid potential issues. For laminated or designer shingles, always adhere to the traditional installation methods as specified by GAF to ensure optimal performance and aesthetic results.
For Immediate Service or Consultation
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Disclaimer: This article is intended for informational purposes only. For professional advice, consult experts in the field.
