Starter Shingles: What They Do + Why Skipping Them Causes Leaks

By The Roofing Brief Team. Last reviewed: October 2026.

Starter shingles are pre-cut strips nailed along the eaves and rakes, under the first course, that put a factory sealant strip at the roof edge so the first course of field shingles bonds down instead of lifting in wind. Are starter shingles more expensive than cutting your own? Per bundle, yes: GAF Pro-Start listed at $42.48 (Lowe’s) to $54.97 (Home Depot) on October 19, 2026, against $39.35 at Lowe’s for a bundle of Owens Corning Supreme 3-tab. Per linear foot, usually no, because a Pro-Start bundle covers about 120.33 lineal feet (GAF Pro-Start sheet, 2020) while a 3-tab bundle of at least 26 shingles (Owens Corning Supreme data sheet) yields about 78 feet of starter once the tabs are cut off. That works out to $0.35 to $0.46 per foot for Pro-Start versus about $0.50 per foot for cut 3-tab, before the labor of cutting.

Short answer: what starter shingles cost and what they do

Shelf prices on October 19, 2026 (Google Shopping retailer listings): GAF Pro-Start $42.48 at Lowe’s and $54.97 at Home Depot for about 120.33 LF; Owens Corning Starter Strip Plus $57.47 at Home Depot for about 105 LF; CertainTeed SwiftStart $50.00 to $70.99 at four building-supply dealers for 116 LF. Divide price by coverage and starter runs $0.35 to $0.61 per linear foot of eave plus rake. Installed labor is folded into most roofing bids by the square, so ask your roofer to list the starter product by name rather than as a separate per-foot charge.

The function is simple and load-bearing for the warranty: the starter strip provides the sealant that bonds the first course of field shingles at the eave. Owens Corning’s sheet says to align Starter Strip Plus “with the sealant toward the eave” and that it “puts the sealant appropriately at the eaves” (Owens Corning Roofer’s Guide). Each field shingle’s own sealant bonds to the shingle below it; at the eave there is no shingle below, so the starter supplies that bond.

Are starter shingles more expensive than cutting 3-tab? Cost per foot

The per-bundle price makes starter look dearer; the per-foot price usually does not. GAF’s own sheet claims “at least 50% more coverage per bundle (vs. typical 3-tab strip shingles)”, which matches the arithmetic: 120.33 LF divided by 78 LF is 1.54.

Product	Listed price (Oct 19, 2026)	Coverage per bundle	Cost per LF	Source
GAF Pro-Start	$42.48 (Lowe’s) to $54.97 (Home Depot)	120.33 LF, 38 pieces 6.5 x 38 in	$0.35 to $0.46	GAF Pro-Start sheet (2020); retailer listings
Owens Corning Starter Strip Plus	$57.47 (Home Depot)	About 105 LF, 32 pieces 7-3/4 x 39-3/8 in	$0.55	Owens Corning Roofer’s Guide; retailer listing
CertainTeed SwiftStart	$50.00 to $70.99 (4 dealers)	116 LF, 36 pieces 7-5/8 x 38-3/4 in	$0.43 to $0.61	CertainTeed SwiftStart sheet (05/23); dealer listings
Cut 3-tab (Owens Corning Supreme)	$39.35 (Lowe’s)	About 78 LF (26 shingles x 36 in, tabs removed)	$0.50, plus cutting labor	Owens Corning Supreme data sheet; retailer listing

Worked example: a gable roof with 180 LF of eave and 100 LF of rake (280 LF) plus 10% waste needs 308 LF. That is 3 bundles of Pro-Start ($127.44 at the Lowe’s price, $164.91 at the Home Depot price) or 4 bundles of cut 3-tab ($157.40), and the 3-tab route adds 104 tab cuts on the ground. Owens Corning’s Roofer’s Guide puts trim waste on shingles at 2% to 10%, so 10% is the conservative end.

Which starter to use: decision table

If your situation is	Use	Why (rule and source)
GAF Timberline HDZ or other LayerLock shingle and you want GAF’s WindProven wind warranty	A GAF starter (Pro-Start, QuickStart or WeatherBlocker)	GAF lists a qualifying GAF starter strip as one of the required accessory categories for WindProven; confirm the current list at gaf.com/LRS
Owens Corning Oakridge and you want the maximum wind warranty	Starter Strip Plus at eaves and rakes	Owens Corning Roofer’s Guide, Starter Strip Plus instructions, step 4
CertainTeed Landmark and you want the 130 mph wind warranty	SwiftStart at eaves and rakes	CertainTeed SwiftStart sheet (05/23)
Shingle exposure over 6 in (some oversize laminates)	A full-width starter, not Starter Strip Plus	Owens Corning: Starter Strip Plus is for exposures of 6 in or less; above that a full 15-1/2 x 39-3/8 in starter is required
Owens Corning Berkshire, Woodmoor, Woodcrest or Devonshire	The starter named in that shingle’s own instructions	Owens Corning says Starter Strip Plus cannot be used with these lines
Basic 3-tab reroof with no enhanced warranty, at or under 116 mph design wind (Class D)	Cut 3-tab is allowed; pre-cut is usually cheaper per foot	Owens Corning Roofer’s Guide cutting method; cost table above
High-wind coastal site	Pre-cut starter at eaves and rakes plus the six-nail pattern	FEMA Technical Fact Sheet 7.3 and Owens Corning’s 130 mph six-nail patterns

What starter shingles do: the wind uplift problem

ASTM D7158 rates asphalt shingles in two parts: wind-tunnel uplift coefficients, then the measured uplift resistance of the sealant strip, which ARMA calls “paramount for keeping the shingle system intact when wind tries to lift shingles and initiate roof system failure” (ARMA technical bulletin, March 2026). The starter is what gives the first course a sealant bond to test against. Eaves, rakes and corners are the higher-pressure zones in ASCE 7 roof wind design, which is why both edges get starter.

A field shingle has two defenses against uplift: its nails (at least four per strip shingle under IRC R905.2.6, six in the makers’ high-wind patterns) and the sealant strip bonding it to the shingle below. The first course at the eave has nails, but without a starter below it, its sealant has nothing to bond to. If the first course flips up, wind gets under the second course and the failure can propagate up the roof.

FEMA’s guidance for high-wind coastal regions, Technical Fact Sheet No. 7.3, Asphalt Shingle Roofing for High-Wind Regions, treats the eave and rake as the starting points to reinforce: its details show a starter with the self-sealing adhesive at the eave, six nails per shingle, and dabs of asphalt roof cement at the rakes.

Pre-cut starter vs DIY cut from 3-tab

Before pre-cut starter, roofers made the starter row by trimming the tabs off 3-tab shingles, and Owens Corning’s Roofer’s Guide still describes that method: “remove the tab portion of each shingle and position the remaining strip with the factory applied adhesive face up along the eaves,” trim at least 4 inches off the first shingle, and fasten along a line 1-1/2 to 3 inches above the eaves. Like cut ridge cap, it works only when done exactly that way.

The failure with cut 3-tab is orientation. If a crew lays a whole 3-tab upside down or rotates the strip so the sealant faces up-roof, the first field course has no bond at its lower edge. GAF’s Pro-Start sheet makes the same point: cut-up shingles “may not have properly positioned adhesive to ensure adequate wind resistance.” Pre-cut starter removes that judgment call, because the perforated sheet splits into two strips that each carry their own sealant line.

The warranty consequence is the bigger cost. CertainTeed’s 130 mph Landmark upgrade requires SwiftStart at eaves and rakes, and Owens Corning’s maximum Oakridge wind warranty requires Starter Strip Plus at eaves and rakes, so a cut 3-tab starter keeps the base warranty but gives up those upgrades.

Method	Sealant position	Coverage per bundle	Upgraded wind warranty	Source
Cut 3-tab, tabs removed	Adhesive face up along the eave, only if cut and placed correctly	About 78 LF	Not eligible where the maker requires its own starter	Owens Corning Roofer’s Guide; Supreme data sheet
Pre-cut starter strip	Factory sealant at the eave edge	105 to 140 LF by brand	Eligible (130 mph on Landmark with SwiftStart; maximum on Oakridge with Starter Strip Plus)	Maker sheets linked on this page
Peel-and-stick starter roll (GAF QuickStart, Owens Corning Starter Shingle Roll, Atlas Pro-Cut Universal 9XR)	Self-adhered to the deck, sealant at the edge	Varies by roll	Check the maker’s accessory list	Maker product pages

Brand options: the major starter products

Like ridge cap, starter is part of the matched manufacturer system: the upgraded wind warranties name the maker’s own starter, so match the starter brand to the field shingle brand when you want those terms. Coverage runs 105 to 140 LF per bundle across the five products below.

Brand product	Manufacturer	Coverage per bundle	Piece size	Wind and code listings	Source
GAF Pro-Start	GAF (matched to Timberline HDZ)	About 120.33 LF	6.5 x 38 in (38 pieces)	ASTM D3161 Class F; ICC-ES ESR-1475; Miami-Dade approved	GAF Pro-Start sheet (2020)
Owens Corning Starter Strip Plus	Owens Corning (matched to Duration)	About 105 LF	7-3/4 x 39-3/8 in (32 pieces)	ASTM D3161 Class F; Florida approval FL10674	Owens Corning Roofer’s Guide
CertainTeed SwiftStart	CertainTeed (matched to Landmark)	116 LF	7-5/8 x 38-3/4 in (36 pieces)	130 mph Landmark wind warranty with SwiftStart at eaves and rakes	CertainTeed SwiftStart sheet (05/23)
IKO Leading Edge Plus	IKO	109 LF	7-7/8 x 40-7/8 in (32 strips)	ASTM D3161 Class F; ASTM D7158 Class H	IKO product page
Atlas Pro-Cut HP42	Atlas (matched to Pinnacle Pristine)	140 LF	10-5/8 x 36 in nominal	ASTM D3161 Class F (tested at 110 mph); FL 16305	Atlas product page

All five rows above are perforated strip products that split on the roof deck edge without cutting. Roll formats exist too (GAF QuickStart Peel and Stick, Owens Corning Starter Shingle Roll, Atlas Pro-Cut Universal 9XR), and a roll is faster on long straight eaves but needs a cut at every corner. For published starter strip dimensions by brand, see our shingle dimensions guide.

Eave installation: the primary use case

Starter shingles run along the entire eave edge of every roof plane, from rake to rake. The sequence below follows the Owens Corning Starter Strip Plus instructions; GAF and CertainTeed sheets follow the same order, so check your brand’s wrapper for its nail line.

1. Confirm drip edge is installed. At the eaves the underlayment laps over the drip edge; at the rakes the drip edge goes over the underlayment (IRC R905.2.8.5 and the Owens Corning Roofer’s Guide).
2. Confirm ice and water shield is installed at the eave where IRC R905.1.2 requires an ice barrier, lapped over the drip edge.
3. Split each Starter Strip Plus shingle at the perforation into two 7-3/4 x 39-3/8 in pieces.
4. Remove 6 inches from the first piece at the rake and set it flush with the rake drip edge.
5. Position each piece with the sealant along the bottom (at the eave edge).
6. Overhang the eave by 1/4 to 3/4 inch; Owens Corning says Starter Strip Plus “can extend no greater than 3/4 inch beyond the edge of the eave.”
7. Nail each piece with 5 fasteners placed 2 to 3 inches from the eave edge, where the first field course will cover them.
8. Butt subsequent pieces (do not lap them), keeping the starter end joints at least 4 inches from the end joints of the first field course.
9. Stop the starter run flush with the opposite rake.

The first field course then starts with a full shingle set even with the lower edge of the starter, per the Owens Corning shingle instructions, so both edges share the same 1/4 to 3/4 inch overhang.

Rake installation: the most commonly missed detail

The rake is the angled edge of a gable roof running from the eave to the ridge. Starter at the rake does the same uplift job as at the eave; GAF sells Pro-Start as an “Eave/Rake Starter Strip” for that reason, and FEMA Fact Sheet 7.3 adds asphalt roof cement dabs at the rake on high-wind jobs.

Rake starter is a warranty condition on two of the big lines: Owens Corning requires Starter Strip Plus “along both the eave and rake edge” for the maximum Oakridge wind warranty, and CertainTeed’s 130 mph Landmark upgrade applies “when Swiftstart is installed along the roof eaves and rakes.”

Rake starter installation:

1. Confirm rake drip edge is installed over the underlayment (IRC R905.2.8.5).
2. Run the starter strip up the rake with the sealant strip facing the rake edge, so the ends of each field course bond to it, as in the GAF Eave/Rake Starter Strip design.
3. Overhang the rake drip edge by 1/4 to 3/4 inch (Owens Corning Roofer’s Guide).
4. Nail on the line printed in your starter’s instructions, keeping fasteners where the field shingles will cover them.
5. In high-wind regions, add the FEMA 7.3 rake detail: two 1-inch dabs of asphalt roof cement under each course end.

On a gable house, the rake run is often a third or more of the total starter footage (100 of 280 feet in the worked example above), so leaving it out also understates the material count on a bid.

The adhesive strip orientation: get this wrong and starter does nothing

The installation error that defeats starter is turning the strip so its sealant faces the ridge instead of the eave. Owens Corning’s instruction is direct: the pieces “should be aligned next to one another with the sealant toward the eave” (Starter Strip Plus instructions, step 3).

If the sealant faces the ridge, it ends up under the upper part of the first field shingle, where that shingle’s own nails already hold it, and the lower edge of the first course has no bond. Wind gets under the leading edge and the first course can lift.

If the sealant faces the eave (correct), it sits directly under the lowest edge of the first field shingle. On cut 3-tab, the same rule applies: Owens Corning says the adhesive goes “face up along the eaves.”

How to tell: before the first course goes on, the sealant line should be visible along the eave edge of every starter piece, not up near the nail line. This is fixable during installation but hidden once the field shingles are on top, so check it on the first plane.

ASTM D7158 wind requirement

The asphalt shingle wind standard named in IRC R905.2.4.1 is ASTM D7158, which classes shingles by the wind speed their sealant bond can resist. ARMA’s March 2026 bulletin gives the class limits, and ASTM D3161 is the older fan-test alternative still printed on starter packaging.

Wind class	Basic wind speed limit (Vult, 3-sec gust)	What the starter must do	Code reference	Source
ASTM D7158 Class D	116 mph or less	Provide the eave sealant bond the class assumes	IRC R905.2.4.1	ARMA bulletin, March 2026
ASTM D7158 Class G	155 mph or less	Same, at eaves and rakes where the maker requires it	IRC R905.2.4.1	ARMA bulletin, March 2026
ASTM D7158 Class H	194 mph or less	Same; IKO lists Leading Edge Plus itself at Class H	IRC R905.2.4.1	ARMA bulletin; IKO product page
ASTM D3161 Class F	Tested at 110 mph	Listed on GAF Pro-Start, Owens Corning Starter Strip Plus, IKO Leading Edge Plus and Atlas Pro-Cut HP42	IRC R905.2.4.1 alternative	Atlas product page; maker sheets

ARMA notes the D7158 classes assume Exposure B or C, a mean roof height of 60 feet or less and no topographic speed-up; outside those conditions the class has to be adjusted. Fastening is separate from the class: several Owens Corning shingle instructions in the Roofer’s Guide show a four-nail pattern for 110 mph and a six-nail pattern for 130 mph, and IRC R905.2.6 sets the code minimum of four fasteners per strip shingle.

Manufacturer warranty implications

Starter is one of the accessory products, along with ridge cap, ice and water shield and underlayment, that GAF, Owens Corning and CertainTeed tie to their upgraded wind and system warranties.

• GAF: the Pro-Start sheet says GAF “offers increased wind coverage on many GAF shingles when you use GAF starter strips” and that Pro-Start is an eligible component for GAF enhanced warranties. GAF’s WindProven wind warranty on LayerLock shingles lists a qualifying GAF starter among its required accessories.
• Owens Corning: Starter Strip Plus is a component of the Owens Corning Total Protection Roofing System, and it is required at eaves and rakes for the maximum Oakridge wind warranty.
• CertainTeed: the Landmark wind warranty upgrades to 130 mph when SwiftStart is installed along the eaves and rakes.
• IKO and Atlas: both publish their starter as part of their shingle systems; check the current warranty document for which accessories are required.

The cost side is small: on the 280 LF example, the matched starter costs $127.44 to $172.41 at October 2026 listings, so ask for the warranty document and confirm which accessories it names before accepting a cheaper substitute.

DIY install steps

Starter is the first roofing step a DIYer touches at the eave, and the Owens Corning Starter Strip Plus instructions give every measurement needed. A DIY install:

1. Measure the total eave length plus rake length and add 10% (Owens Corning puts trim waste at 2% to 10%).
2. Divide by the bundle coverage: 120.33 LF for GAF Pro-Start, 105 LF for Owens Corning Starter Strip Plus, 116 LF for CertainTeed SwiftStart. Round up.
3. Buy the starter made by your field shingle’s maker if you want its upgraded wind warranty.
4. Confirm drip edge and ice and water shield are correctly installed.
5. Lay out the first starter piece on the eave with the sealant at the bottom edge, 6 inches removed at the rake, overhanging the drip edge by 1/4 to 3/4 inch.
6. Nail with roofing nails long enough to penetrate the deck, 5 per piece, 2 to 3 inches from the eave edge (Starter Strip Plus spec).
7. Butt subsequent pieces and keep end joints at least 4 inches from the joints of the first field course.
8. At rakes, run starter up the rake with the sealant toward the rake edge and the same 1/4 to 3/4 inch overhang.

The most common DIY mistake is the reversed strip described above. Check that the sealant line is at the eave before nailing.

Common starter mistakes

1. Adhesive strip facing the wrong direction. Strip must face the eave or rake edge, not the ridge.
2. No starter at the rakes. Required for Owens Corning’s maximum Oakridge wind warranty and CertainTeed’s 130 mph Landmark upgrade.
3. Cut 3-tab placed wrong. Tabs must be removed and the adhesive set face up along the eave (Owens Corning Roofer’s Guide); even done right, it forfeits warranties that require the maker’s starter.
4. Overhanging too much. Owens Corning caps the overhang at 3/4 inch beyond the eave.
5. Overhanging too little. The same guide calls for at least 1/4 inch so water drips past the drip edge.
6. Wrong nail position. Starter Strip Plus fasteners go 2 to 3 inches from the eave edge; nails outside the area the first course covers end up exposed.
7. Lined-up joints. Owens Corning requires starter end joints at least 4 inches from the first course’s end joints.
8. Mixing brands. Generic starter on a branded field roof drops the upgraded wind warranty tiers.
9. Skipping starter at dormers and step-ups. Every roof plane needs starter at its eave and rakes, including small dormer roofs.

Cost per home size

Worked bundle counts for example roof perimeters, using 10% waste and October 19, 2026 listings: GAF Pro-Start at 120.33 LF and $42.48 to $54.97 per bundle, Owens Corning Starter Strip Plus at 105 LF and $57.47. Measure your own eave and rake lengths; these perimeters are illustrations, not averages.

Example roof	Eave LF	Rake LF	Total LF + 10%	GAF Pro-Start bundles and cost	OC Starter Strip Plus bundles and cost
1,200 sq ft small ranch	120	60	198	2: $84.96 to $109.94	2: $114.94
1,800 sq ft mid ranch	160	80	264	3: $127.44 to $164.91	3: $172.41
2,400 sq ft 2-story colonial	180	100	308	3: $127.44 to $164.91	3: $172.41
2,400 sq ft hip roof	250	0 (hip has no rake)	275	3: $127.44 to $164.91	3: $172.41
3,200 sq ft large 2-story	220	140	396	4: $169.92 to $219.88	4: $229.88
4,000 sq ft custom complex	280	200	528	5: $212.40 to $274.85	6: $344.82

Starter for specialty roof types: metal, hip, low slope

The pre-cut starter products above are made for asphalt shingle roofs. Starter logic changes for other roof types:

• Metal roofs. Standing seam and exposed-fastener panels use no shingle starter; the eave is closed by the panel maker’s eave trim or cleat. A high-temperature ice and water shield goes under the panels where IRC R905.1.2 requires an ice barrier.
• Hip roofs. Hip roofs have no rakes, so all starter goes at the eaves: in the table above, the 2,400 sq ft hip roof needs 275 LF against 308 LF for the gable colonial.
• Low-slope shingle sections (2:12 to under 4:12). IRC R905.2.2 allows asphalt shingles down to 2:12. Between 2:12 and 4:12, the Owens Corning Roofer’s Guide calls for two layers of non-perforated felt or one self-adhering membrane, starting with a 19-inch strip at the eave; starter goes on top as usual.
• Cedar shake or wood shingle. Wood roofs start with a doubled first course of wood shingles or shakes under IRC R905.7 (wood shingles) and R905.8 (wood shakes) and the wood maker’s instructions; asphalt starter strips are not used there.

Starter in the broader roof system

Starter is one of four edge and detail components, with ridge cap, ice and water shield and drip edge, that the IRC and the shingle makers address by section: drip edge in R905.2.8.5, ice barrier in R905.1.2, wind class in R905.2.4.1 and fasteners in R905.2.6. At $127 to $172 for a 280 LF roof, starter is a small line item, yet it is named in every upgraded wind warranty quoted above. For the full system breakdown, read parts of a roof and asphalt shingle roof lifespan.