Roof size reference
Roof size for a 1,800 sq ft house
One story: about 20.9–23.8 squares (2,087–2,380 sq ft of roof) at 4/12–8/12. Two stories: about 10.4–11.9 squares over a 900 sq ft footprint.
1,800 sq ft ranch, by pitch
| Pitch | Roof sq ft | Squares | Bundles* | Ice barrier sq ft |
|---|---|---|---|---|
| 4/12 | 2,087 | 20.9 | 69 | 654 |
| 5/12 | 2,145 | 21.5 | 71 | 654 |
| 6/12 | 2,214 | 22.1 | 74 | 654 |
| 7/12 | 2,292 | 22.9 | 76 | 654 |
| 8/12 | 2,380 | 23.8 | 79 | 654 |
| 9/12 | 2,475 | 24.8 | 82 | 654 |
| 10/12 | 2,577 | 25.8 | 86 | 654 |
| 12/12 | 2,800 | 28 | 93 | 654 |
*3/square + 10% waste. Footprint 1,800 + 10% overhang = 1,980 sq ft.
Two stories instead?
A two-story 1,800 sq ft house sits on about 900 sq ft, so its roof is 10.4–11.9 squares.
Early budget · architectural shingles · our provisional setting
$10,500 – $23,800
1,800 sq ft ranch, 20.9–23.8 squares, Ohio and Michigan. Two-story: $5,200–$11,900.
Winter details for 1,800 sq ft in Ohio or Michigan
Attic vents. With about 1,800 sq ft of attic floor, the IRC R806.2 ratios work out to 1,728 sq in of net free vent area at 1/150 or 864 sq in at 1/300, about 432–864 sq in of it at the soffits. That balance keeps the deck cold and cuts ice dams.
Eave ice barrier. Assuming a rectangle 1.5 times as long as wide, a 1,800 sq ft ranch has about 109 ft of eaves. At 6/12 with a 12-inch overhang that is 2 courses (40.2 in up the slope), roughly 654 sq ft of membrane where your local code calls for it.
Frequently asked questions
How many squares is a 1,800 sq ft ranch roof?
About 20.9 to 23.8 squares between 4/12 and 8/12; at 6/12 it is 22.1 squares (2,214 sq ft).
How many bundles for a 1,800 sq ft one-story house?
69–79 bundles at 3 per square with 10% waste; 74 at 6/12.
What about a two-story 1,800 sq ft house?
Its footprint is about 900 sq ft, so the roof is roughly 10.4–11.9 squares.
Early budget for a 1,800 sq ft ranch roof?
$10,500–$23,800 for architectural shingles using our provisional $500–$1,000 per square setting, not a quote.