Asphalt roofs rely on a dedicated starter strip or starter shingles installed at the eaves to create a straight edge, improve edge protection, and resist wind uplift. The starter layer serves as the foundation for the first course of shingles, helping ensure proper alignment and water shedding. In many U.S. homes, using an asphalt starter is considered a best practice when installing asphalt shingles, though some manufacturers offer adhesive-backed starter products that eliminate some steps. This guide explains what an asphalt starter is, why it matters, and how to install it safely and effectively.
What Is Asphalt Starter On Roof
An asphalt starter on a roof refers to the starter strip or starter shingles positioned at the eaves (and sometimes along the rake) to start the shingles with a clean edge. It provides a straight line, an initial seal, and a stable nailing surface for the first row of shingles. The starter edge is designed to overhang the eave slightly to manage runoff and prevent water from seeping under the edge. Some starter products are adhesive-backed, while others rely on roofing cement or fasteners for attachment. Regardless of type, the goal is a secure, uniform edge that resists wind uplift and helps extend roof life.
Key benefits include: a uniform starting line, improved water shedding at the edge, reduced risk of shingle cupping or curling, and better wind resistance for the first row of shingles. Using a proper starter strip also minimizes waste and ensures that the shingle tabs align correctly with the rest of the roof surface.
Why Use Asphalt Starter On Roof
The starter layer is essential for both performance and aesthetics. Without a proper starter, the first course of shingles may misalign, curl, or be more susceptible to wind damage. An asphalt starter creates a defined edge that makes alignment easier for the entire roof and helps maintain consistent overhang along the eaves. It also helps seal the edge against moisture infiltration and reduces the chance of ice dams in colder regions when paired with proper underlayment and ice-and-water shield in vulnerable areas.
From a building science perspective, starting with a dedicated starter strip minimizes the risk of wind-driven blow-off. It also provides a predictable anchor point for fasteners, which can improve the overall integrity of the roof assembly. In climate zones with heavy rainfall or wind, investing in a quality starter product can pay off in longer shingle life and fewer repairs over time.
Types Of Starter Strips
There are two common types of asphalt roof starters: adhesive-backed starter strips and non-adhesive starter shingles. Adhesive-backed starters have a pre-applied adhesive that bonds to the underlayment or roof deck, simplifying installation and creating a strong seal. Non-adhesive starters rely on a thin bead of roofing cement or mechanical fastening to secure the edge and hold the first course in place until the shingles are installed.
Some households use starter strips that match the width of standard shingles, while others use dedicated starter shingles that are specifically cut to align with the first course. The choice often depends on manufacturer recommendations, local climate, and the wind zone in the area. Always follow the product instructions and local code requirements when selecting a starter option.
Materials And Tools Needed
Having the right materials and tools on hand helps ensure a fast, clean installation. Typical items include:
- Starter strip or starter shingles (adhesive-backed or conventional, as recommended by the shingle manufacturer)
- Compatible underlayment or roof deck material
- Ice-and-water shield or flashing in appropriate locations
- Roofing nails appropriate for asphalt shingles
- Roofing cement or adhesive as specified
- Chalk line, tape measure, and straightedge
- Utility knife or scissors for cutting starter strips
- Hammer or pneumatic nailer, depending on preference
- Ladder, fall protection, gloves, and eye protection
Using manufacturer-approved starter products ensures compatibility with the shingles and the warranty. In colder climates or high-wind regions, additional fasteners or sealant may be required to meet local codes.
Step-By-Step Installation Guide
- Prepare the roof surface by removing any old shingles or debris and ensure the deck is clean and dry. Verify that eaves are straight and level before applying the starter.
- Install underlayment and edge protection along the eaves. If an ice-and-water shield is recommended by code or the manufacturer, apply it at the eaves and in any valley or exposed area.
- Position the starter strip along the eave line, ensuring a slight overhang for proper drainage. Align with the edge of the roof and make sure the edge remains straight as you secure it.
- If using adhesive-backed starters, remove the release liner and press the strip firmly into place along the entire length. For non-adhesive starters, hold the strip in place with a small amount of roofing cement or light nails at the outer corners to prevent movement.
- Secure the starter according to the manufacturer’s instructions. Typical practice involves anchoring the ends and a few midpoints, ensuring a consistent edge. Avoid overdriving nails to prevent deck damage.
- Begin the first course of shingles directly over the starter, following the manufacturer’s alignment guides. The first row should align with the starter’s edge to maintain a clean line for the roof edge.
- Continue installing shingles up the slope, maintaining consistent spacing and alignment. Check for any gaps or cupping and adjust as needed before moving higher on the roof.
- Finish with corner and rake edges as required by the shingle line and manufacturer. Seal edges with proper flashing and cement where needed to prevent air leakage and water intrusion.
Pro tip: Work from the lower edge upward and from one side to the other to preserve alignment. Always follow the roofing manufacturer’s installation guide for the specific starter product you are using.
Common Mistakes And Troubleshooting
Avoid these pitfalls that can compromise the effectiveness of an asphalt starter:
- Ignoring manufacturer instructions—use the product that matches your shingles and climate zone.
- Starting without proper edge alignment—the starter should create a straight, consistent edge across the entire eave.
- Skimping on underlayment or ice-and-water shield in zones prone to ice dams and heavy rain—these layers work with the starter to prevent leaks.
- Overloading nails or too-tight fasteners—this can distort the deck or pull away the edge over time.
- Neglecting to seal joints at rake edges and corners—the starter edge should integrate with flashing and drip edge for a complete barrier against moisture.
Maintenance And Longevity
Regular inspection helps extend roof life. After installation, check the eaves edge for lifted edges or loose sections, especially after storms. Replace damaged starter strips promptly and reseal with manufacturer-approved products. Clean debris along the eaves to maintain smooth drainage and prevent water pooling at the edge. If you notice curling or buckling in the starter area, investigate possible wind uplift, improper nailing, or underlayment issues that may require professional assessment.
In colder climates, ensure there is adequate drainage to prevent ice buildup. While the starter edge itself is not a primary heat source, pairing it with quality underlayment and high-quality shingles can contribute to a longer-lasting roof system overall.
Codes, Standards, And Safety
Roofing installations in the United States should comply with local building codes and safety standards. The National Roofing Contractors Association (NRCA) provides guidance on proper installation, including starter strips and edge protection. Shingle manufacturers specify compatible starter products and nail patterns for wind resistance. Always follow these guidelines to preserve warranty and performance. Use fall protection and proper PPE when working on a roof, and verify ladder stability and scaffold or roof anchor placement before starting work.
Environmental And Energy Considerations
Starter strips made from asphalt are typically part of standard shingle systems, but choices influence energy performance. Light-colored or reflective starter products can contribute to a cooler roof surface in hot climates, supporting energy efficiency and comfort inside the home. When selecting materials, consider recycled-content options and compatibility with other energy-smart components like reflective shingles and underlayment. Local incentives or codes may encourage high-performance roofing assemblies that minimize heat gain and material waste.
Frequently Asked Questions
Q: Do I need a starter strip with every asphalt shingle roof?
A: Most asphalt shingle installations benefit from a dedicated starter strip or starter shingles to ensure edge alignment, water shedding, and wind resistance. Always follow the shingle manufacturer’s recommendations and local codes.
Q: Can I install starter strips myself, or should I hire a pro?
A: A confident DIYer with basic roofing experience can install starter strips using manufacturer instructions. For complex roofs, high winds, or warranty requirements, hiring a licensed roofer is advisable.
Q: How long does an asphalt starter last?
A: The starter’s lifespan depends on climate, maintenance, and the rest of the roof system. When paired with quality shingles and proper support, the starter edge contributes to the durability of the entire roof, often matching the expected life of the shingle installation.