GAF Shingles: Timberline HDZ, Costs & Bundle Math (2026)

GAF shingles are the most common architectural shingle on roofs across Lake County, and the math behind them is refreshingly simple: it takes 3 bundles of GAF shingles to cover one roofing square (100 square feet), and each bundle covers about 33.3 square feet. A typical bundle retails in the $30 to $50 range as a typical retail range — your installed price depends on the line, the color, and the roof itself, so treat any number as a range until a contractor inspects the roof. If you want to turn your own roof measurements into a bundle count before you call anyone, run them through our shingle bundle calculator — it does the square-to-bundle conversion and the waste allowance for you.

Timberline HDZ vs Timberline NS: What Is the Difference?

Timberline HDZ is GAF’s flagship architectural shingle. It is a thick, dimensional laminate shingle with a layered shadow-line look, and it is the line most contractors quote when a homeowner asks for a standard architectural roof. Timberline NS (Natural Shadow) is the value architectural line: still a dimensional laminate shingle, but with a slightly simpler profile and a lower price point. Both lines use the same bundle math — 3 bundles per square, 33.3 square feet per bundle — so the choice between them changes the look and the price, not the counting.

GAF Bundle Math: Bundles Per Square and Coverage

Roofing is sold by the square, and a square is 100 square feet of roof surface — not floor area. Measure the roof planes, divide by 100, and you have squares. Then multiply by 3 for bundles. A bundle of GAF architectural shingles covers 33.3 square feet, which is exactly one third of a square, so the arithmetic always lands on whole bundles for whole squares.

Roof size	Squares	Bundles (no waste)	Bundles with 10% waste
1,000 sq ft	10	30	33
1,500 sq ft	15	45	50
2,000 sq ft	20	60	66
2,500 sq ft	25	75	83
3,000 sq ft	30	90	99

The 20-Square Worked Example

Take a typical Waukegan ranch with 2,000 square feet of roof surface. That is 20 squares. At 3 bundles per square, the field shingles come to 60 bundles before waste, and 66 bundles with a 10 percent waste allowance. At the typical retail range of $30 to $50 per bundle, the field-shingle material alone lands at $1,800 to $3,000 at retail before waste, or $1,980 to $3,300 with the waste allowance included. Ridge caps, starter strips, underlayment, and flashing are separate line items, and labor is the larger share of any installed quote — the bundle price is only the material starting point.

That example also shows why roof pitch matters to the count. A steeper roof has more surface area than a shallow roof over the same floor plan, so the square count — and the bundle count — climbs with pitch. If you are measuring your own roof, our guide to the roof pitch calculator explains how pitch changes the surface area and why two houses with identical footprints can need very different bundle counts.

GAF Shingle Cost: What a Bundle Price Does and Does Not Tell You

A bundle retail price of $30 to $50 is useful for comparing lines, but it is not a roof quote. An installed roof price bundles together tear-off and disposal of the old roof, underlayment, ice and water shield at the eaves and valleys, flashing, ventilation, and labor — and in Lake County, ice and water shield coverage matters more than it does in warmer climates, because ice dams at the eaves are a real winter failure mode. A bid that is dramatically below the range for your square count usually means something is missing from the scope, not that you found a bargain.

Warranty Notes: Read the Framing, Not Just the Word Lifetime

GAF markets its architectural lines with a lifetime limited warranty framing, and that phrase deserves a careful read. A lifetime limited warranty is not a promise that the roof lasts forever, and it is not a promise that labor is covered forever. Coverage terms, transfer rules, and what counts as a manufacturing defect are spelled out in the warranty document itself, and the strongest coverage usually depends on the roof being installed as a complete system with matching GAF accessories by a credentialed contractor. Keep the warranty document and the contract together, and confirm before signing who registers the warranty and what, if anything, that registration costs.

GAF Shingles in Illinois: Wind, Ice, and Algae

Illinois roofs face three enemies that southern roofs do not: freeze-thaw cycles, ice dams, and summer storm winds off Lake Michigan. Architectural shingles handle wind better than flat 3-tab shingles because their laminated layers are heavier and their sealant strips bond a larger area. That does not make any shingle storm-proof — no asphalt shingle is — but it is one reason architectural lines dominate new roofs in Lake County. If your street loses shingles in every big storm, ask your contractor about the wind rating of the specific line quoted and whether the installation uses the fastening pattern that rating requires.

How to Read a GAF Bid

A fair GAF bid names the line (HDZ or NS), the color, the square count, the bundle count including waste, the underlayment and ice-shield scope, and the disposal plan. Compare bids line by line: an HDZ bid and an NS bid are different roofs at different prices, and a bid that omits the bundle count is a bid you cannot check. Run the square count through our shingle bundle calculator and see whether the quoted bundle count is in the fair range for your roof. If it is far outside the range with no explanation — a very steep roof, a cut-up roofline — ask what is driving it before you sign.

It also helps to know the alternatives before you commit to a brand. Our guide to Owens Corning shingles covers the Duration series with the same bundle math, and our architectural shingles guide explains the dimensional category as a whole, so you can compare GAF against the category rather than against a single competitor’s brochure.

Frequently Asked Questions

How many bundles of GAF shingles are in a square?

Three bundles of GAF shingles cover one roofing square (100 square feet). Each bundle covers about 33.3 square feet, so a 20-square roof needs 60 bundles before waste, or 66 bundles with a 10 percent waste allowance for cuts at hips, valleys, and rakes.

What is the difference between Timberline HDZ and Timberline NS?

Timberline HDZ is GAF’s flagship architectural shingle with a deeper, more varied shadow pattern and a wider accessory system. Timberline NS is the value architectural line: still a dimensional laminate shingle, but with a simpler profile and a lower price. Both use the same bundle math of 3 bundles per square, so the choice changes the look and the price, not the counting.

How much does a bundle of GAF shingles cost?

A typical bundle of GAF shingles retails in the $30 to $50 range, depending on the line and color. That is a material-only retail range: an installed roof price also includes tear-off, disposal, underlayment, ice and water shield, flashing, ventilation, and labor. Final pricing is set after an on-site inspection of the roof.

What warranty do GAF shingles carry?

GAF architectural lines are marketed with a lifetime limited warranty framing, but the details — coverage terms, transfer rules, and what counts as a manufacturing defect — are in the warranty document itself, and the strongest coverage usually depends on installation as a complete system with matching accessories. Keep the warranty document with your contract, and confirm who registers the warranty and who covers workmanship issues.

How many bundles do I need for a 2,000 square foot roof?

A 2,000 square foot roof surface is 20 squares, which needs 60 bundles of GAF shingles before waste and 66 bundles with a 10 percent waste allowance. Roof pitch increases surface area, so a steep roof over the same floor plan needs more bundles. Ridge caps, starter strips, and underlayment are separate from the field-shingle bundle count.