Choose the shingle product before you count bundles. The product data sheet sets the order math: bundles per square, pieces per square, exposure, nail count, and the matching starter strip and ridge cap. A 3-tab product and a designer product cover the same roof square with different bundle counts, so the same roof needs a different order depending on the product you pick.
Which shingle class are you buying?
Name one of the three common classes, then read its figures from the product’s own data sheet. The class changes how many bundles cover a square and how the shingles look on the roof.
| Class | Example product | Bundles per square | Pieces per square | Exposure |
|---|---|---|---|---|
| 3-tab | GAF Royal Sovereign | 3 | 79 | 5 in |
| Architectural | GAF Timberline HDZ | 3 | 64 | 5 5/8 in |
| Architectural | Owens Corning Oakridge | 3 | 64 | 5 5/8 in |
| Designer | GAF Camelot II | 4 | 56 | 7 1/2 in |
The 3-tab Royal Sovereign carries 79 pieces per square with a 5 in exposure. The architectural products carry 64 pieces per square with a 5 5/8 in exposure. The designer Camelot II carries 56 pieces per square with a 7 1/2 in exposure and packs 4 bundles to the square. These are product-specific figures, not industry standards.
The Camelot II data sheet states 4 bundles per square while the 3-tab and architectural examples state 3. An order built on “3 bundles per square” for every product shorts a designer roof by one quarter.
How does the product change the bundle count?
Multiply the roof squares by the product’s bundles-per-square figure. The roof area stays the same; only the packaging changes.
Bundles = roof squares × bundles per square
Worked fixture: a 20-square roof
The figures below are worked arithmetic fixtures for one 20-square roof, not project quantities.
- Royal Sovereign, Timberline HDZ, or Oakridge: 20 × 3 = 60 bundles.
- Camelot II: 20 × 4 = 80 bundles.
The designer choice adds 20 bundles for the same coverage. That is the cost of switching classes, visible before you price anything.
A bundle of a 3-bundles-per-square product covers about 33.3 ft²; a bundle of a 4-bundles-per-square product covers about 25 ft². A lower per-bundle price can still mean a higher per-square price.
Which starter strip and ridge cap go with the field shingle?
Starter strips and hip & ridge caps arrive in their own bundles and need their own coverage figures. Manufacturers pair accessories with field products: the Camelot II data sheet recommends TimberTex hip & ridge shingles and WeatherBlocker starter strips, while the Royal Sovereign data sheet lists ProStart or WeatherBlocker starters and Royal Sovereign ridge caps.
Ridge cap coverage is stated in linear feet, not squares. GAF’s Seal-A-Ridge packs 45 pieces per bundle and covers about 25 lineal feet at the proper 6 2/3 in exposure. GAF states that ridge cap bundles generally cover 20 to 33 lineal feet depending on the brand and overlap.
Ridge cap bundles = lineal feet of hips and ridges ÷ lineal feet per bundle
Worked fixture: 150 lineal feet of hips and ridges
For 150 lineal feet of hips and ridges with Seal-A-Ridge at about 25 lineal feet per bundle: 150 ÷ 25 = 6 bundles. This is a worked fixture, not a project order.
Starter strips are also sold by the bundle with coverage stated in lineal feet. Read the package or data sheet for the chosen starter product, because its coverage changes with the product and exposure. Match the exposure of the field shingle: a 5 in 3-tab exposure and a 7 1/2 in designer exposure do not share the same accessory figures.
How many nails does the product need?
Take the nails-per-square figure from the data sheet. The Royal Sovereign page lists 316 nails per square, and the Camelot II data sheet lists 280 nails per square, rising to 336 where a 6-nail-per-shingle pattern is required. A 6-nail pattern raises the count by half over a 4-nail pattern, so check local code and the wind-warranty instructions before fixing the number.
Nails = roof squares × nails per square
Worked fixture: the same 20-square roof
- Royal Sovereign at 4 nails per shingle: 20 × 316 = 6,320 nails.
- Camelot II at 4 nails per shingle: 20 × 280 = 5,600 nails.
Nails are a separate line on the order. The shingle bundles do not include them.
How do you keep the color consistent across the order?
Buy the whole order in one product and one dye lot. The dye-lot code printed on the wrapper identifies the production batch; shingles from different lots can show as visible bands on the roof.
Check regional and color availability before you commit to a product. The Camelot II data sheet lists regional availability and a set color range, and manufacturers warn that screens and printed catalogs do not reproduce granule colors exactly. View physical samples of the actual color before ordering.
Order enough of the chosen product the first time. A second order placed weeks later risks a different dye lot, and a color or product change mid-roof leaves a visible seam that no allowance calculation fixes.
What does the selection record hold?
Write one record that another person could order from without asking a question. Keep the record with the takeoff and the delivery paperwork.
| Field | Record |
|---|---|
| Product | Manufacturer, product name, and class |
| Bundles per square | From the data sheet, with edition or crawl date |
| Pieces per square | From the data sheet |
| Exposure and dimensions | From the data sheet |
| Coverage per square | Data-sheet coverage, for example 98.4 ft² for Oakridge |
| Nails per square | Data-sheet figure and the nail pattern it assumes |
| Starter product | Manufacturer-paired product and its lineal-foot coverage per bundle |
| Hip and ridge product | Product, pieces per bundle, and lineal-foot coverage at stated exposure |
| Color and dye lot | Exact color name and lot code for the whole order |
| Supplier and date | Quoted availability, selling unit, and quote date |
Common product-selection mistakes
- Applying 3 bundles per square to every product. Designer shingles like Camelot II pack 4 bundles to the square.
- Ordering field bundles only and discovering at delivery that starter strips and ridge caps are missing.
- Assuming ridge cap bundles cover roof squares. They cover lineal feet at a stated exposure.
- Mixing dye lots or colors on one roof.
- Assuming one nail count. The data-sheet figure and the 4-nail or 6-nail pattern both change it.
- Comparing products by price per bundle when bundles cover different areas.
- Ordering accessories in a different color than the field shingle.
Safety and professional scope
The shingle choice does not approve the roof pitch, the underlayment system, the structural capacity for staged bundles, or the fall protection plan. Those decisions follow the product instructions, local code, the project documents, site conditions, and the responsible people.
Verify the staged bundle load where the roof structure supports it, and keep the structural check and the safety plan with the project documents, not with the material worksheet.
Sources and scope
- GAF Royal Sovereign product page, Specs & Codes: 79 pieces/square, 3 bundles/square, 316 nails/square, 5 in exposure, 12 in by 36 in English dimensions.
- GAF Timberline HDZ product page, Specs & Codes: 64 pieces/square, 3 bundles/square, 5 5/8 in exposure, 13 1/4 in by 39 3/8 in dimensions.
- Owens Corning Oakridge product page, Technical Information: 64 shingles/square, 3 bundles/square, 98.4 sq ft coverage per square, 5 5/8 in exposure.
- GAF Camelot II data sheet: 56 pieces/square, 4 bundles/square, 280 nails/square (336 with 6 nails per shingle), 7.5 in exposure, recommended TimberTex hip/ridge and WeatherBlocker starter.
- GAF, All about Hip and Ridge Cap Shingles: Seal-A-Ridge 45 pieces per bundle, about 25 lineal feet at 6 2/3 in exposure; ridge cap bundles generally cover 20 to 33 lineal feet.
- NIST Handbook 44, 2026 Appendix C: 1 roofing square (building) equals 100 ft².
Scope: all product figures are product-specific records retrieved 2026-10-18 and can change with new packaging or revisions. The wrapper label and the current product data sheet control the accepted figures on a real project. The worked numbers are arithmetic fixtures, not project quantities.
Review responsibility: Saleem Sial owns the published calculation, source, and editorial checks. Waseem Sial, External Reviewer and Engineer, remains listed for ongoing external review; no completed external-review date is claimed.
Next, measure a physical bundle with the bundle measurement guide, convert planning area with the squares and bundles guide, add the allowance with the roofing waste allowance guide, or browse the Roofing Calculators hub.
