How Many Bundles of Shingles for 100 sq ft?
100 sq ft of roof surface is 1 roofing squares. With 10% waste and standard 3-bundle-per-square shingles you need 4 bundles. If 100 sq ft is the house footprint rather than the roof, multiply by the pitch factor first: at a 6/12 pitch that becomes 4 bundles.
Bundles for 100 sq ft of roof by waste factor
| Waste | Squares | 3 bundles / square | 4 bundles / square |
|---|---|---|---|
| 5% (simple gable) | 1.1 | 4 | 5 |
| 10% (typical) | 1.1 | 4 | 5 |
| 15% (hips & valleys) | 1.2 | 4 | 5 |
| 20% (complex, cut-up) | 1.2 | 4 | 5 |
If 100 sq ft is the house footprint
Shingles cover the sloped roof, not the floor plan. Multiply the footprint (including overhangs) by the pitch factor to get roof surface:
Shingle cost for 100 sq ft
| Shingle type | Material per square | Total for 100 sq ft (+10%) |
|---|---|---|
| 3-tab shingles | $80–$120 | $88–$132 |
| Architectural shingles | $100–$160 | $110–$176 |
| Premium shingles | $160–$250 | $176–$275 |
Shingles only. Underlayment, flashing, ridge cap, disposal and labour are extra.
Nails and underlayment
| Underlayment | Typical roll coverage | Rolls (+10% laps) |
|---|---|---|
| Synthetic underlayment | 1,000 sq ft | 1 |
| #15 felt | 400 sq ft | 1 |
| #30 felt | 200 sq ft | 1 |
Nails: about 352 with a standard 4-nail pattern, or 528 with a 6-nail high-wind pattern. Check roll labels: coverage varies by brand.
Frequently asked questions
How many bundles of shingles do I need for 100 sq ft?
For 100 sq ft of roof surface you need 4 bundles of standard shingles (3 bundles per square) including 10% waste, or 4 bundles with 15% waste for a roof with hips and valleys. Heavier shingles packed 4 bundles per square need 5 bundles.
How many squares is 100 sq ft?
A roofing square is 100 sq ft, so 100 sq ft is 1 squares, or 1.1 squares once you add 10% for waste.
Is 100 sq ft the house size or the roof size?
Shingles are ordered by roof surface, which is larger than the house footprint because of the slope and overhangs. If 100 sq ft is your footprint, multiply it by your pitch factor: at 6/12 the roof is 112 sq ft and needs 4 bundles.
How much do shingles for 100 sq ft cost?
At typical material prices, shingles for 100 sq ft of roof (with 10% waste) cost about $88–$132 for 3-tab shingles, $110–$176 for architectural shingles, $176–$275 for premium shingles. That is materials only; installation usually costs more than the shingles.