Starter Shingles: The First Course That Stops Blow-Offs

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Most people looking at a roof see the field of shingles and the ridge. The part that does a lot of the work in a windstorm is easier to miss: the strip of material tucked under the first course along the eaves and up the rakes. Starter shingles give the bottom row something to bond to and cover the gaps between the first-course shingles, so the roof edge does not become the place where wind gets a grip and water gets in. When the starter course is missing, installed upside down or cut from the wrong material, the edge shingles are often the first to lift, crease and blow off. This guide covers what starter shingles do, purpose-made strips versus cut shingles, how the starter course works with drip edge, underlayment and gutter details, what Colorado wind and hail mean for roof edges, warranty considerations and what repairs commonly cost.

Part of our Structure & Exterior guide — start there for the full picture →

What Starter Shingles Do at the Eaves and Rakes

A starter course is the first layer of shingle material installed along the roof perimeter, under the first visible row. It serves two main purposes.

It puts a sealant line where the first course needs one. Most modern asphalt shingles have a strip of factory-applied adhesive that bonds each course to the one below after the sun warms it. The first course has no shingle below it, so without a starter its lower edge would sit loose on the underlayment. A starter strip has its own adhesive positioned so it lands under the leading edge of the first course. Once sealed, that edge is far harder for wind to peel up.

It covers the joints in the first course. Three-tab shingles have cutouts between the tabs, and all shingles have butt joints where one ends and the next begins. In the field, the course below covers those gaps. At the eave, the starter does that job, so water running through a cutout or joint lands on shingle material rather than directly on the underlayment or deck.

Along the rakes, the sloped gable edges, a starter strip performs a similar sealing role. The rake edge takes wind from the side and is a common place for shingles to lift and fold back. Many manufacturers recommend or require starter along the rakes as well as the eaves, particularly on products marketed for higher wind ratings.

Why the edge matters so much in wind

Wind flowing over a roof creates suction, and the strongest uplift tends to occur at the edges, corners and ridge. FEMA’s Wind Retrofit Guide for Residential Buildings (FEMA P-804), written for hurricane-prone regions, notes that damage to roof coverings has historically been one of the leading causes of building performance problems in high-wind events, and that losing the roof covering can lead to substantial water damage to interior finishes and contents. Colorado is far from the coast, but the principle carries over: a roof that loses shingles at the edge in a windstorm is open to water at the next rain or snowmelt.

Purpose-Made Starter Versus Cut Shingles

There are three common ways roofers create a starter course. Only two are generally acceptable.

Purpose-made starter strips

Most major shingle manufacturers sell dedicated starter products, typically narrow rolls or strips sized for the eave and rake, with adhesive placed to bond with the first course of their shingles. These are fast to install, put the sealant exactly where the manufacturer intends, and are often listed by the manufacturer as part of its roofing system. On architectural (laminated) shingles, which have no tab cutouts to trim, a purpose-made starter is usually the cleanest option.

Cut three-tab shingles

The traditional method is to take a three-tab shingle, cut off the tabs, and install the remaining strip with the sealant strip facing up and positioned near the eave. Some manufacturers permit this with their own three-tab products, and when done correctly it puts the adhesive where it needs to be. The downsides are labor, the chance of inconsistent cuts, and the fact that three-tab shingles have become less common in some markets, so a roofer may be mixing products.

Why upside-down full shingles fail

A shortcut that still turns up on inspections is laying full shingles upside down, or turned so the tabs point up the roof, as the starter course. The idea is that the solid portion covers the eave edge. The problem is the adhesive. On a flipped shingle, the factory sealant ends up in the wrong place, often at the top of the strip, so the first course has nothing to bond to at its leading edge. The tab cutouts can also end up near the eave, exposing gaps. A roof with this detail may look fine from the ground and then lose its first course in the first strong wind. Many manufacturers’ installation instructions specifically warn against it, and it can be a reason a warranty claim is questioned.

Placement details that matter

• Overhang. The starter, and therefore the first course, typically overhangs the drip edge slightly so water drips clear of the fascia. Too little overhang lets water wick back; too much leaves a floppy edge the wind can catch. The manufacturer’s instructions give the specific range.
• Staggered joints. Starter joints should be offset from the first-course joints so they do not line up.
• Fastener location. Starter nails go where the manufacturer specifies, generally placed so they will be covered by the first course and will not interfere with the adhesive line.
• Sealant activation. Adhesive strips need warmth to bond. Roofs installed in cold weather may need hand-sealing with roofing cement per the manufacturer’s directions.

FEMA’s Home Builder’s Guide to Coastal Construction (FEMA P-499), a coastal high-wind publication, advises that after shingles have had enough sun exposure to activate the sealant, the roofing should be checked to confirm the tabs have sealed. That is a reasonable expectation inland too. Unsealed edges are an easy thing for a roofer to verify on a follow-up visit.

How Starter Shingles Work With Drip Edge, Underlayment and Gutters

The starter course is one layer in a stack of edge details. Each layer has to be lapped in the right order so water moves downhill and outward without finding a path behind something.

Drip edge

Drip edge is the L-shaped metal flashing along the eaves and rakes. FEMA P-804 recommends a drip edge at gable rakes and eaves, describing it as protecting the edge of the roof sheathing and helping move water away from the fascia board, and notes that installing it over the underlayment helps secure the underlayment at the roof edges. Common practice places the drip edge under the underlayment at the eaves and over it at the rakes, though local code and manufacturer details vary, and FEMA’s retrofit guidance follows the FORTIFIED approach of drip edge over underlayment. The starter course sits on top, overhanging the metal. Our drip edge guide covers the profiles and the eave-versus-rake lapping order.

Underlayment and ice barrier

Beneath the starter and shingles, the deck is covered with underlayment, typically synthetic sheet or felt, and in colder climates a self-adhered ice barrier membrane along the eaves. That membrane is meant to stop water from ice dams backing up under the shingles from reaching the deck. The starter course sits directly over the edge of this layer. FEMA P-499 lists using underlayment as a key issue for asphalt shingle roofs in high-wind regions. Our guides to roof underlayment and ice and water shield cover material choices and where codes commonly require ice barrier.

Gutter apron

Where gutters hang off the fascia, some roofers use a gutter apron, a flashing with a longer lip that extends down into the gutter, instead of or in addition to standard drip edge. It closes the gap between the roof edge and the back of the gutter so water does not run behind it. The starter course and first shingle course still overhang the apron the same way. Our gutter apron guide explains when it is worth the extra cost.

Ridge, penetrations and flashing

Starter shingles only protect the bottom and sides of the roof. Wind and water also attack the top and anything that penetrates the deck. Ridge cap shingles and vents need their own sealing and fastening, covered in our ridge vent guide. Around vents, skylights and walls, flashing and sealing products play a similar role; our flashing tape guide covers where self-adhered tapes help and where they are no substitute for proper metal flashing. FEMA P-804 describes flashings as the components that weatherproof roof edges, penetrations, walls, valleys and other places where the roof covering is interrupted or ends.

Colorado Wind, Hail and the Roof Edge

The Front Range sees strong downslope wind events, especially near the foothills in places like Boulder, Jefferson and El Paso counties, along with frequent summer hail. Both put the roof edge to the test.

Wind

Gusty winds find any unsealed edge. A missing or improperly installed starter course at the rakes is a common reason shingles peel back along gable ends, and once a few edge shingles lift, the next course is exposed and damage can spread. FEMA P-804 states that a shingle’s warranty length is not an indicator of its ability to resist a particular wind speed, and recommends selecting a product with a wind class rating equal to or greater than the design wind speed for the location. It also notes that asphalt shingles are required to be installed according to the manufacturer’s instructions and that fasteners belong on the nail line or in the nail zone the manufacturer specifies. Those points come from guidance written for hurricane-prone regions, but they apply to any roof that sees high wind.

Hail

Hail damages shingles by bruising the mat and knocking off granules. Edge shingles are not uniquely vulnerable to hail, but hail-bruised shingles can lose their seal and lift more easily in later wind. After a hail claim, a roof replacement is a good time to confirm the starter is being installed correctly at both eaves and rakes. Our hail damage roof guide covers how hail damage is identified and documented. Impact-resistant shingles are common in Colorado for this reason; our asphalt shingles guide compares three-tab, architectural and impact-rated products.

Leaks at the eave

Water stains on a soffit, rot at the bottom of the fascia, or damp insulation over an exterior wall are sometimes traced back to an edge problem: a missing starter that leaves first-course joints open, a drip edge lapped the wrong way, or an ice dam pushing water past a short ice barrier. Our roof leak guide walks through how leaks are traced, since the stain often appears some distance from the entry point.

Warranties and Manufacturer Requirements

Shingle warranties vary widely by manufacturer and product line. Many manufacturers offer enhanced or system warranties that require the use of certain accessory products, often including the manufacturer’s own starter strips, along with its underlayment, ridge cap and ventilation products. Some also tie higher wind warranty coverage to specific installation methods, such as additional nails per shingle or starter installed along the rakes.

The details are product-specific and change over time, so the practical steps for homeowners are general:

• Ask the roofer which manufacturer warranty applies, and whether it is the standard limited warranty or an enhanced system warranty.
• Ask whether the warranty requires a specific starter product and installation at eaves and rakes.
• Get the warranty registration confirmation in writing if registration is required.
• Keep the invoice listing the products used.

A roof installed with upside-down full shingles as a starter, or without starter at the rakes where the manufacturer calls for it, may not meet the installation instructions. Whether that affects coverage depends on the manufacturer and the claim, so it is worth asking before work begins rather than after a blow-off.

What Starter Shingle Repairs and Roof Edges Typically Cost

Costs vary by roof size, pitch, height, access and the roofer’s minimum charge. These are general 2026 ranges, not quotes:

• Starter material: purpose-made starter strips are a small part of a roof’s material cost, commonly sold by the bundle, and add relatively little to a full replacement.
• Edge repair on an existing roof: re-securing or replacing a section of blown-off edge shingles often falls within a roofer’s minimum service charge, frequently in the low-to-mid hundreds of dollars, more if the roof is steep or tall.
• Rake or eave rework: removing and reinstalling the first courses to add a proper starter, drip edge or gutter apron along a long eave may run several hundred dollars to more than a thousand, depending on length and whether damaged sheathing or fascia needs replacing.
• Full replacement: where edge problems are widespread or the roof is near the end of its life, replacement is usually the better value. Our roof replacement cost guide covers the main cost drivers on the Front Range.

Many Colorado jurisdictions require a permit for reroofing. Ask whether the quote includes the permit, starter at both eaves and rakes, drip edge and ice barrier, so bids can be compared on the same scope.

What a Home Inspector Can and Cannot See

The ASHI Standard of Practice directs inspectors to inspect roofing materials, roof drainage systems, flashing, and skylights, chimneys and roof penetrations, and to describe the roofing materials and the methods used to inspect the roof. The exterior section also includes eaves, soffits and fascias accessible from ground level.

The starter course itself is mostly hidden beneath the first course, so an inspector usually cannot confirm the product or how it was installed. What an inspector can observe are its symptoms: lifted or creased edge shingles, missing shingles at the eaves or rakes, exposed tab cutouts or nail heads at the edge, edge shingles with no visible overhang past the drip edge, and staining on soffits or fascia. Where conditions are visible and suspicious, the usual recommendation is evaluation by a qualified roofer. Our structure and exterior inspections hub covers roof and exterior evaluation in more depth, and the main guide to hiring a home inspector explains how to choose one.

References

• Wind Retrofit Guide for Residential Buildings (FEMA P-804), for hurricane-prone regions — Federal Emergency Management Agency
• Home Builder’s Guide to Coastal Construction (FEMA P-499), Fact Sheets 7.2 and 7.3 — Federal Emergency Management Agency
• ASHI Standard of Practice for Home Inspections — American Society of Home Inspectors

Seeing lifted shingles along the gable ends or stains on the soffit of a home under contract? Get in touch and we can connect you with a Front Range inspector who looks closely at roof edges, flashing and drainage.