Introduction
GAF starter strips are essential components in the installation of GAF shingles, offering a combination of functionality and efficiency that ensures a secure, long-lasting roof. Proper installation of these starter strips is critical to maintaining the structural integrity and aesthetic appeal of the roof. By following precise techniques—such as correct cutting, alignment, and nailing—roofers can achieve optimal results that enhance both performance and durability.
The use of GAF starter strips eliminates the need for cutting and repositioning individual shingles at the base of the roof, streamlining the installation process and reducing labor time. These strips come with built-in adhesive properties and are designed to work in tandem with GAF’s roofing systems, including their architectural and weather-resistant shingle lines. When installed correctly, they provide a clean edge and contribute significantly to the overall wind resistance of the roof, especially in high-wind zones.
This article provides a comprehensive, step-by-step breakdown of GAF starter strip installation, drawing from verified instructions found in technical guides and manufacturer documentation. The goal is to equip U.S. contractors, DIY enthusiasts, and roofing professionals with the knowledge to install these strips accurately and efficiently, ensuring a durable and visually appealing roof.
Preparing for GAF Starter Strip Installation
Before beginning the installation of GAF starter strips, it is essential to complete the foundational steps of roof preparation. This includes the installation of a roofing underlayment and a drip edge. The drip edge is particularly important, as it serves as a barrier against water infiltration and wind-driven rain. It should be installed along the eaves and rakes of the roof, extending beyond the edge to prevent water from seeping underneath the shingles.
Roofing cement should also be applied at critical junctions, such as around roof valleys, chimneys, and vents, to ensure strong adhesion and watertight seals. These preparatory steps are crucial for creating a secure base that enhances the effectiveness of the GAF starter strips and the overall shingle installation.
Next, the width of the starter strips must be measured and adjusted according to the desired overhang. Typically, the overhang ranges between ¼ inch and ¾ inch, depending on the roof design and local building codes. Once the overhang is determined, the width of the starter strip is marked at both ends of the roof, and a chalk line is used to create a straight reference line across the roof surface. This ensures that the starter strips are aligned consistently and will provide a flush appearance when installed.
GAF starter strips are supplied as single pieces that must be cut through the center to create two usable strips. The number of strips required depends on the perimeter of the roof. The strips should be cut precisely, using a straight edge or smart square to ensure accuracy.
Installing the First Starter Strip
The installation process begins at the lowest corner of the roof. The first GAF starter strip is positioned at this point, ensuring that it includes the desired overhang on both sides of the corner and aligns with the chalk line. The adhesive strip on the back of the starter strip should be oriented closer to the drip edge of the roof than the peak. This positioning helps to improve wind resistance, particularly in high-wind areas.
Nailing the first starter strip is a critical step that ensures stability and durability. The first nail should be placed between 1.5 inches and 3 inches from the beginning side edge of the roof. This initial placement helps to anchor the strip securely. The remaining three nails should be spaced between 10 inches and 12 inches apart, with the fourth nail positioned between 1 inch and 2 inches from the ending edge of the strip. This nailing pattern ensures that the starter strip remains flush with the chalk line and is properly secured to the roof deck.
For metric dimensioned shingles, it may be necessary to trim the first starter strip. Specifically, the first WeatherBlocker starter strip should have 5 inches trimmed, or the first ProStart starter strip should have 3 inches trimmed. This adjustment ensures that the starter strip butt joints and overlapping shingle butt joints are offset by a minimum of 4 inches. If required, additional sections of starter strip may be cut and installed in 10- to 12-inch increments to maintain this offset. These adjustment strips should be fastened with two nails, each placed between 1 inch and 2 inches from each side end.
Installing Subsequent Starter Strips
After the first starter strip is installed, the second strip is placed directly adjacent to it, in line with the chalk line. The same nailing technique is used for the second strip, with the first nail placed between 1.5 inches and 3 inches from the side edge and the remaining nails spaced 10 to 12 inches apart. This pattern is repeated along the lowest line of the roof.
When approaching the far end of the roof, the final starter strip should be cut to allow for the desired overhang. A smart square may be used to ensure a clean, straight cut. Once cut, the strip is nailed into place using the same technique as the previous strips.
The process is repeated for the sides of the roof, with the same overhang and nailing pattern applied. It is important to note that the initial starter strips should not be used as a guide for alignment. Instead, the chalk line should be used to maintain accuracy and ensure a flush, professional finish.
Pre-Cutting GAF Shingles for Efficient Installation
GAF architectural shingles are designed to be laid in an offset pattern, which enhances both aesthetics and drainage. To facilitate this, the first shingle in each row should be pre-cut before installation. This step not only improves the appearance of the roof but also makes the installation process more efficient.
To pre-cut the first shingle in each row, measure at recommended intervals—typically 6 inches—and mark each sheet to be cut at 6 inches, 11 inches, or 17 inches from the rake edge. The GAF deck protection, part of the GAF roofing system, is designed with a grid pattern that makes it easy to mark these intervals accurately.
The lowest row of shingles should begin with a full sheet that completely overlays the starter strip at the lowest corner, including the overhang of the drip edge. The remaining rows should be cut at the marked intervals. If the roof is tall enough, it may be necessary to start again with a full sheet midway through the installation and then continue with pre-cut shingles.
Nailing Techniques for GAF Shingles
Proper nailing techniques are essential for the durability and performance of GAF shingles. The nails should be placed through the black marker strip on the shingle, which is designed to guide the installer for optimal placement. The first full sheet of shingles should be nailed in the same way as the starter strip: one nail on each side, followed by a nail in the middle, and then additional nails at desired intervals or as required by local building codes.
When nailing GAF starter strips, it is important to position the nails correctly. On special starter strips that are used in high-wind zones, the nails should be placed between 1.5 inches and 3 inches above the bottom edge of the roof. This placement helps to maximize wind resistance by securing the strip firmly to the roof deck while allowing the adhesive strip to remain close to the drip edge.
The perforated design of some GAF starter strips eliminates the need for cutting, making the installation process faster and more efficient. These strips can be laid directly over the underlayment and drip edge, with the adhesive strip positioned near the lower edge of the strip. Once in place, the strip is nailed according to the specified pattern, ensuring a secure and long-lasting installation.
Aligning Shingles for Structural Integrity
Correctly aligning shingles is a critical step in the installation process that maintains the structural integrity of the roof and prevents blow-offs. The first row of shingles should be flush with the drip edge and should overlap the starter strip. A chalk line is an invaluable tool for maintaining straight and level alignment, resulting in a professional and polished finish.
To ensure proper alignment, the first row of shingles should be installed with care. The edges should be straight, and the overlap should be consistent. Once the first row is in place, the remaining rows should be staggered according to the offset pattern. This staggered alignment not only improves the aesthetic appeal of the roof but also enhances its ability to channel water away from the roof surface.
GAF recommends using a chalk line to mark the alignment for each row of shingles. This technique helps to maintain straight, consistent lines across the entire roof surface, resulting in a uniform and visually appealing finish. By following these alignment techniques, roofers can ensure that their GAF shingle installations are both functional and beautiful.
Ensuring Aesthetic and Functional Excellence
Beyond the technical aspects of installation, the visual outcome of the roofing project is also a key consideration. GAF starter strips and architectural shingles are designed to create a seamless and attractive finish that enhances the curb appeal of any home or building. The offset pattern of the shingles, combined with the clean edges provided by the starter strips, contributes to a polished and professional look.
In addition to aesthetics, the functional performance of the roof is equally important. The use of GAF’s LayerLock™ and StainGuard Plus™ technologies further enhances the durability and longevity of the roof. These advanced features help to resist algae growth, improve wind resistance, and extend the lifespan of the roofing system.
Regular inspections and maintenance are also recommended to ensure that the roof continues to perform at its best. By addressing any issues early, such as loose shingles or damaged underlayment, homeowners can prevent more significant problems from developing over time.
Conclusion
The installation of GAF starter strips is a foundational step in the roofing process that significantly impacts the performance, durability, and appearance of the roof. By following the precise techniques outlined in this guide—ranging from measurement and cutting to nailing and alignment—roofers can achieve a secure, long-lasting, and visually appealing result.
Whether working on a new roof installation or a replacement project, the use of GAF starter strips simplifies the process and enhances the final outcome. The combination of adhesive properties, perforated designs, and advanced technologies ensures that these strips contribute to a robust and resilient roofing system.
For U.S. contractors, DIY enthusiasts, and roofing professionals, understanding and applying the correct installation procedures is essential to achieving a high-quality result. With the guidance provided by verified technical documentation and manufacturer instructions, installers can confidently complete projects that meet both functional and aesthetic expectations.