Roof size reference
Roof size for a 3,500 sq ft house
One story: about 40.6–46.3 squares (4,058–4,627 sq ft of roof) at 4/12–8/12. Two stories: about 20.3–23.1 squares over a 1,750 sq ft footprint.
3,500 sq ft ranch, by pitch
| Pitch | Roof sq ft | Squares | Bundles* | Ice barrier sq ft |
|---|---|---|---|---|
| 4/12 | 4,058 | 40.6 | 134 | 912 |
| 5/12 | 4,171 | 41.7 | 138 | 912 |
| 6/12 | 4,304 | 43 | 143 | 912 |
| 7/12 | 4,457 | 44.6 | 148 | 912 |
| 8/12 | 4,627 | 46.3 | 153 | 912 |
| 9/12 | 4,813 | 48.1 | 159 | 912 |
| 10/12 | 5,012 | 50.1 | 166 | 912 |
| 12/12 | 5,445 | 54.5 | 180 | 912 |
*3/square + 10% waste. Footprint 3,500 + 10% overhang = 3,850 sq ft.
Two stories instead?
A two-story 3,500 sq ft house sits on about 1,750 sq ft, so its roof is 20.3–23.1 squares.
Early budget · architectural shingles · our provisional setting
$20,300 – $46,300
3,500 sq ft ranch, 40.6–46.3 squares, Ohio and Michigan. Two-story: $10,200–$23,100.
Winter details for 3,500 sq ft in Ohio or Michigan
Attic vents. With about 3,500 sq ft of attic floor, the IRC R806.2 ratios work out to 3,360 sq in of net free vent area at 1/150 or 1,680 sq in at 1/300, about 840–1,680 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 3,500 sq ft ranch has about 152 ft of eaves. At 6/12 with a 12-inch overhang that is 2 courses (40.2 in up the slope), roughly 912 sq ft of membrane where your local code calls for it.
Frequently asked questions
How many squares is a 3,500 sq ft ranch roof?
About 40.6 to 46.3 squares between 4/12 and 8/12; at 6/12 it is 43 squares (4,304 sq ft).
How many bundles for a 3,500 sq ft one-story house?
134–153 bundles at 3 per square with 10% waste; 143 at 6/12.
What about a two-story 3,500 sq ft house?
Its footprint is about 1,750 sq ft, so the roof is roughly 20.3–23.1 squares.
Early budget for a 3,500 sq ft ranch roof?
$20,300–$46,300 for architectural shingles using our provisional $500–$1,000 per square setting, not a quote.