For most asphalt shingles sold in Louisiana, the answer is simple: three bundles equal one square, and one square covers 100 square feet of finished roof. That ratio covers nearly every architectural and 3-tab shingle on the residential market — but heavier designer shingles, hip-and-ridge caps, and starter strips all carry their own coverage math, and getting any of them wrong is what leaves homeowners short a pallet on install day.
The Short Answer
- Standard architectural and 3-tab shingles: 3 bundles per square (100 sq ft).
- HD architectural shingles: usually 3 bundles per square; verify the wrapper.
- Designer / presidential shingles: 4 or 5 bundles per square — each bundle is heavier and covers less area.
- Hip and ridge caps: sold by linear foot, not square — usually 20–35 linear feet per bundle.
- Starter strip: typically 105–120 linear feet per bundle.
Why It's Packaged That Way
A bundle is sized so a single roofer can carry it up a ladder safely. Splitting a square into three bundles puts each one in the 60–80 lb range for standard architectural shingles, which is the practical upper limit for repeated overhead lifts. Designer shingles weigh more per square inch, so manufacturers split a square into four or five lighter packages instead.
How to Calculate Bundles for Your Roof
- Measure the roof area in square feet. Length × width of each roof plane, then add the planes together. On a hip or complex roof, an aerial measurement report is more accurate than ground measurement.
- Divide by 100 to get squares. A 2,800 sq ft roof = 28 squares.
- Multiply by bundles per square. 28 squares × 3 bundles = 84 bundles of field shingles for a standard architectural product.
- Add a waste factor. 10% on a simple gable, 15% on a moderate roof with a few hips and valleys, 20% on a steep or cut-up roof with dormers. The 28-square example becomes roughly 31–34 squares ordered.
- Add the accessory line items separately. Starter, ridge cap, underlayment, ice-and-water, drip edge, pipe boots, and flashing are not included in the field shingle count.
A Worked Example
2,400 sq ft single-story home in Metairie — moderate hip roof, architectural shingles:
- 2,400 sq ft ÷ 100 = 24 squares
- 24 × 1.15 waste = ~28 squares ordered
- 28 squares × 3 bundles = 84 bundles of field shingles
- Plus ~3 bundles hip/ridge cap, 2 bundles starter, underlayment for 28 squares, drip edge for the full perimeter, ice-and-water for valleys and eaves, and boots/flashing for every penetration.
Where Homeowners Get the Math Wrong
- Treating the footprint as the roof area. A pitched roof is always larger than the home's floor plan — sometimes 20–40% more.
- Forgetting waste on complex roofs. Every valley and hip is a cut, and cuts become scrap.
- Counting hip/ridge cap as field shingles. Cap is a separate SKU with its own coverage rate.
- Skipping starter strip. Using cut field shingles for starter voids most manufacturer wind warranties — including the warranties Louisiana homeowners rely on after named storms.
- Ignoring the disposal load. Two layers of tear-off can double the dumpster pulls a project needs.
How We Stage Materials on Cajun Home Services Projects
Calculating bundles is only half the job. On every roof we install across Greater New Orleans, Jefferson Parish, the Northshore, and the Baton Rouge area, we plan staging before delivery so the load lands where the crew can reach it without overloading any single rafter bay.
- Rooftop loading by spec. Bundles are split across the ridge and over load-bearing walls, never piled in one stack on the field.
- Ground staging when rooftop loading isn't safe. Older decks, steep pitches, and shaded HOA-restricted driveways often call for ground delivery and ladder-lift.
- Same-day accessory delivery. Starter, cap, underlayment, drip edge, and ice-and-water arrive together so the crew never improvises with the wrong material.
- Daily JobTread photo updates. Homeowners see the delivery, tear-off, dry-in, and finish stages from their phone — the same platform we use to track every project.
When to Call a Licensed Contractor Instead of DIY-Ordering
Louisiana law requires a state contractor's license for any residential job over $7,500, and reroofs nearly always exceed that threshold once tear-off, dumpsters, underlayment, flashing, and labor are priced in. Beyond the legal threshold, an installation mistake — wrong nail pattern, missing starter, undersized ventilation, no ice-and-water at valleys — is the kind of defect that surfaces years later as an interior water stain, not at the final walkthrough. Cajun Home Services holds Louisiana Residential Contractor License #889646 and carries general liability and workers' compensation on every project.