A 30 × 50 ft house with a 4/12 gable roof and 12-in overhangs has about 1,754 sq ft of roof — 17.5 squares. Order 56 bundles of architectural shingles, including 4% waste.
| Item | Covers | Buy |
|---|---|---|
| Starter strip | 171 ft | 2 bundles |
| Hip & ridge cap | 52 ft | 3 bundles |
| Underlayment | 1,754 sq ft | 2 rolls |
| Ice & water | 208 ft | 4 rolls |
| Drip edge | 171 ft | 18 × 10 ft |
| Nails | 5,433 nails | 1 coil box |
| Ridge vent | 40 ft | 10 × 4 ft |
Code runs it from the eave edge to 24 in inside the exterior wall, measured level — counted here from the wall's inside face, as Owens Corning requires. With a 12-in overhang and 6-in wall at 4/12 that is 44 in up the slope → 2 courses of 36-in membrane. Valleys get one 36-in strip centered on the valley line.
Exhaust 720 sq in → 40 ft of ridge vent at 18 sq in per ft. Intake 720 sq in → 80 ft of continuous soffit vent or 13 16×8 vents. Intake should match or beat exhaust; if your attic qualifies for 1/300 (balanced vents, plus a vapor retarder in climate zones 6–8), halve these.
| Line | Bundles | Est. cost |
|---|---|---|
| Architectural32.8 sq ft per bundle | 56 | $2,519 |
| GAF Timberline HDZ32.8 sq ft per bundle | 56 | $2,519 |
| OC Duration32.8 sq ft per bundle | 56 | $2,344 |
| OC Oakridge32.8 sq ft per bundle | 56 | $2,248 |
| CertainTeed Landmark33.3 sq ft per bundle | 55 | $2,103 |
| IKO Cambridge / Dynasty33.3 sq ft per bundle | 55 | $2,474 |
| Atlas Pinnacle33.3 sq ft per bundle | 55 | $2,474 |
| 3-tab32.3 sq ft per bundle | 57 | $2,450 |
Typical range $7,341–$12,603 · about $5.69 per sq ft of roof
One layer of old architectural shingles ≈ 2.1 tons and 8.8 cu yd. Book a 30-yard dumpster (about 3 tons included). Rentals run $395–$875; shingles hit the weight limit long before the bin is full.
Shelf prices from McCoy's (San Marcos, TX) checked Oct 23, 2026; GAF Timberline HDZ, IKO and Atlas shingles use a typical architectural price. Tap any price to use your supplier's.
| Pitch | Multiplier | Roof sq ft | Squares | Bundles | Ice & water rolls |
|---|---|---|---|---|---|
| 3/12 | 1.031 | 1,715 | 17.2 | 55 | 4 |
| 4/12 | 1.054 | 1,754 | 17.5 | 56 | 4 |
| 5/12 | 1.083 | 1,803 | 18 | 58 | 4 |
| 6/12 | 1.118 | 1,860 | 18.6 | 59 | 4 |
| 7/12 | 1.158 | 1,926 | 19.3 | 62 | 4 |
| 8/12 | 1.202 | 2,000 | 20 | 64 | 4 |
| 9/12 | 1.25 | 2,080 | 20.8 | 66 | 4 |
| 10/12 | 1.302 | 2,166 | 21.7 | 69 | 4 |
| 12/12 | 1.414 | 2,353 | 23.5 | 75 | 4 |
With 12-in overhangs the roof covers 32 × 52 ft = 1,664 sq ft of plan. A 4/12 pitch multiplies that by √(1 + (4/12)²) = 1.0541, giving 1,754 sq ft. CertainTeed's waste table puts a 1,754 sq ft gable at 4%, so 1,754 × 1.04 ÷ 32.8 sq ft per bundle = 55.61, rounded up to 56 bundles.
As a hip roof the surface is the same, but the edges change: 168 ft of eaves and 93 ft of hips need 2 starter and 5 ridge-cap bundles, and the waste allowance rises from 4% to 10% — 59 bundles instead of 56.
Is 1,500 sq ft your living area rather than the footprint? On a two-story house the footprint is about 750 sq ft, and the same 4/12 roof drops to about 9.1 squares and 30 bundles. Always measure the outside of the house, one floor.
Ice & water shield: (12 in of overhang + 6 in of wall + 24 in inside it) × 1.054 = 44 in up the slope, so 2 courses of 36-in membrane along 104 ft of eaves — 4 rolls of 65 ft after 6-in end laps.
The full method, material data and tips are on the main roofing calculator page.