Roof shingles starter strips are the first shingle layer installed along a roof’s eaves and, in many systems, its rakes. Though mostly hidden beneath the first visible course, they help seal the roof edge against wind-driven rain and reduce the risk of shingles lifting. Choosing the right starter product and installing it in the right position can affect both weather protection and warranty compliance. Here’s how starter strips work, what options are available, and what to check before a roofing project begins.
What Are Roof Shingles Starter Strips?
A starter strip is a narrow row of roofing material installed beneath the first full course of asphalt shingles. It is positioned at the lower edge of a roof, called the eave, and may also be installed along the sloping sides, called the rakes. Starter strips are designed to provide a consistent base and an adhesive surface for the shingles above them.
Many starter shingles have a factory-applied adhesive near one edge. When the first course is laid over the starter, the adhesive helps bond the shingles together after exposure to suitable warmth and sunlight. This bond helps resist wind uplift at the roof perimeter, where shingles can be more vulnerable than those farther up the roof.
Starter strips are not the same as underlayment, drip edge, or ice-and-water protection. Each serves a different purpose. Underlayment covers the roof deck beneath the shingles; drip edge directs water away from the roof edge; and, where required or appropriate, self-adhering membrane provides additional protection against water intrusion. Starter strips are part of the shingle system and do not replace those components.
Why Starter Strips Matter
They Help Protect the Roof Perimeter
The roof edge experiences wind pressure and turbulent airflow. If the first shingle course does not have adequate support or bonding, its tabs can lift, crease, or break loose. A properly positioned starter strip gives the first course a more consistent surface and places adhesive where it can help secure the shingle edge.
Starter shingles can also help cover gaps between the cutouts or tabs in the first visible course. Without appropriate coverage, water driven by wind may have a more direct path toward the roof deck or underlayment. Starter strips are one part of a layered roofing assembly; they are not a guarantee against leaks if other details are defective.
They Support a Neat, Consistent First Course
A starter strip can create a straight, uniform baseline for the first row of shingles. Its thickness and placement help establish the roof-edge overhang and can help prevent the shingle cutouts from lining up with exposed seams beneath them. The exact layout depends on the shingle design and manufacturer instructions.
They May Be Required by Product Instructions
Shingle manufacturers commonly publish installation instructions that specify starter placement, offset, overhang, and fastening. Those details can differ by product. Following the instructions matters for performance and may be necessary to maintain eligibility for a manufacturer’s limited warranty. Local building codes and project specifications may also apply.
Types of Starter Strips
| Type | How It Works | Key Consideration |
|---|---|---|
| Factory-made starter shingles | Purpose-built strips, often with an adhesive line and dimensions designed for a particular shingle system. | Check the product instructions for the correct orientation, placement, and compatible shingles. |
| Cut strips made from three-tab shingles | Roofers cut standard shingles into narrower pieces and use them as starter material. | Cutting and positioning must produce the intended seal and coverage; some manufacturers restrict or discourage this method. |
| Cut strips made from laminated shingles | Sections are cut from architectural shingles for use at the roof edge. | The shape and thickness may make them unsuitable as a substitute for a dedicated starter product. Follow manufacturer guidance. |
Dedicated starter shingles are often the simplest option because their size, adhesive placement, and intended use are defined by the manufacturer. Field-cut material can be appropriate in some systems, but it should not be assumed to perform identically. A roofer should confirm that any substitute complies with the shingle maker’s instructions and local requirements.
Where Starter Strips Are Installed
At the Eaves
The eave is the lower horizontal edge of the roof. Starter material is typically installed along this edge before the first full shingle course. The exact position relative to the drip edge and roof edge is important: too little overhang may leave the edge exposed, while excessive overhang can interfere with drainage or leave shingles vulnerable to bending and damage.
Roof systems vary in how drip edge, underlayment, and starter shingles overlap. The correct sequence can depend on local code, manufacturer instructions, and the roof detail. Rather than relying on a universal sequence, the installer should use the specifications for the particular roofing system and jurisdiction.
Along the Rakes
The rake is the sloping edge on the side of a roof. Some manufacturers call for starter strips along rakes as well as eaves, especially where wind exposure makes the edge more vulnerable. Others specify different details. Starter material at a rake should be installed only when the product instructions or roof design call for it.
When a roof has both eaves and rakes, the corners where these edges meet need careful layout. Proper alignment helps avoid gaps or overlapping pieces that disrupt the shingle pattern. The installer should also make sure the edge components are compatible with the flashing and drip-edge details.
How Starter Strips Are Installed
Installation details vary by shingle brand, design, roof slope, and local requirements. The following outline explains the general process, not a substitute for the product instructions or professional roofing specifications.
- Prepare the roof deck. The deck should be sound, dry, and suitable for roofing. Any damaged sheathing, protruding fasteners, or debris should be addressed before the roofing layers are installed.
- Install the specified edge protection. Underlayment, self-adhering membrane, and drip edge are installed according to the applicable code and system instructions. Their required order can vary, so the project details should be checked before work starts.
- Confirm the starter product and orientation. Starter strips are not always symmetrical. The adhesive strip must face the direction specified by the manufacturer so it can bond with the first full course.
- Set the edge alignment. The starter row is positioned to create the specified overhang and a straight line. The installer should check the roof edge rather than assume it is perfectly straight.
- Fasten as directed. Nail type, location, and quantity should follow the shingle manufacturer’s instructions and applicable code. Incorrectly placed fasteners can affect holding strength and may create pathways for water.
- Install the first full course. The first course is laid over the starter with the required offset and overhang. Its adhesive area should align with the starter’s seal strip as instructed.
- Check the finished edge. The installer should look for consistent alignment, secure fastening, proper coverage, and any exposed gaps before continuing up the roof.
In general, shingles should be installed when conditions allow them to lie flat and seal as intended. Cold temperatures, dust, debris, and shaded or poorly ventilated locations can affect the timing or reliability of adhesive bonding. Manufacturers may specify hand-sealing procedures in certain conditions; those instructions should be followed rather than applying sealant indiscriminately.
Common Starter Strip Mistakes
- Skipping the starter course: Installing the first visible row directly on the roof deck can leave the perimeter without the intended backing or adhesive arrangement.
- Reversing the strip: An incorrectly oriented starter can put the adhesive in the wrong place, preventing the intended bond with the first course.
- Using the wrong substitute: Not every cut shingle is suitable starter material. A substitute may not provide the designed seal, width, or coverage.
- Incorrect edge overhang: A poorly positioned first course can leave the drip edge exposed or create an unsupported edge that is more likely to bend or break.
- Misplaced or insufficient fasteners: Fasteners installed outside the specified zone may reduce holding strength or damage the roofing material.
- Assuming adhesive seals immediately: Self-sealing strips may rely on appropriate exposure and weather conditions to bond. They should not be treated as instant waterproofing.
- Ignoring the rake detail: Rake installation requirements differ among products and roof designs. Omitting or improvising the detail can leave an edge vulnerable.
How to Choose the Right Starter Shingles
Start with the installation instructions for the exact field shingles being used. Confirm whether the manufacturer requires a dedicated starter product, permits cut shingles, or specifies separate products for eaves and rakes. The instructions should also clarify the adhesive orientation, fastener placement, and required edge dimensions.
Compatibility matters. A starter product designed for one roofing system may not match the adhesive pattern or dimensions of another. A product’s packaging and technical documents can help identify its intended use, but the field-shingle instructions remain an important reference.
For a replacement or repair, identify the existing shingle type and the extent of damage before selecting materials. If the roof is under warranty or part of an insurance claim, the owner may want to document the existing conditions and check relevant requirements before work begins. A qualified roofer can assess whether repairs are practical or whether deterioration is widespread.
Cost and Material Planning
Starter shingles are a relatively small portion of a typical asphalt-shingle roof’s material budget, but the quantity depends on the total length of the eaves and any rakes that require starter strips. Product packages list their coverage, so takeoffs should be based on the roof’s measured edge lengths and the manufacturer’s stated coverage rather than a rough estimate.
Material pricing varies by brand, region, product availability, and project size. Labor costs also depend on roof access, pitch, tear-off requirements, and the condition of the deck. A roofing estimate should state whether starter strips are included and identify the product or installation method. Comparing bids is more useful when they describe the same scope and materials.
Questions to Ask a Roofing Contractor
- Which starter product will be installed, and is it compatible with the specified shingles?
- Will starter strips be installed at the eaves, rakes, or both?
- Which manufacturer instructions and local code requirements apply?
- How will the starter strips align with the drip edge and other roof-edge materials?
- Are the materials and installation included in the written estimate and warranty documentation?
Answers should be specific to the roof and product, not based solely on a general claim that all starter strips are the same. Photos of the roof edges before they are covered can also help document the work, particularly for larger projects.
How to Check Starter Strip Work
Starter strips are usually covered by the first shingle course, so they cannot be fully inspected after installation without lifting roofing material. During an active project, a homeowner can ask the contractor to show the product label and take photos of the edge before the first course is installed.
After the roof is complete, visible checks are limited to the overall alignment and condition of the eaves and rakes. Look for uneven shingle edges, lifted corners, exposed gaps, or signs of water intrusion inside the building. A visible defect does not establish that the starter strip itself is the cause, but it warrants prompt evaluation, especially after severe weather.
Because roof work involves fall hazards and weatherproofing details, repairs are generally best handled by trained professionals. Walking on a roof can damage shingles and create a serious safety risk. A contractor familiar with the product can inspect the edge assembly and determine whether a repair is needed.
Reliable Guidance and References
For product-specific requirements, consult the installation instructions and technical documents published by the shingle manufacturer. For code questions, check the locally adopted building code and speak with the local building department; requirements can differ by location and project. The National Roofing Contractors Association also provides homeowner resources on roofing systems and contractor selection. The most dependable installation is one that follows the specific shingle system instructions and applicable local requirements.