ES

7/12 Roof Pitch

A 7/12 pitch rises 7 inches for every 12 inches of run: 30.26°, a 58.3% slope and a multiplier of 1.158.

I know the

Roof pitch

7/12 pitch

30.3° · 58.3% · ×1.158

7/12 is 30.26°, a 58.3% slope, and the roof is 15.8% larger than its footprint.

  • Angle30.26°
  • Percent slope58.3%
  • Pitch multiplier1.1577
  • Hip and valley factor1.5298
  • Rafter per foot of run13.89 in
  • Slope class (OSHA)Steep (over 4 in 12)

Pitch is rise in inches over 12 inches of run. The multiplier turns a flat measurement into sloped length: multiply the footprint area by it to get roof area.

Planning estimate, not a quote. Disclaimer

What a 7/12 pitch looks like

At 7/12 the roof is steep enough to shed water and snow quickly, and it has 10% more surface than a 4/12 roof on the same footprint. The roof rises 7 inches for every 12 inches of run. That is a 30.26° angle, a 58.3% slope and a roof surface 15.8% larger than its footprint.

Roof area at 7/12

Multiply the footprint by 1.1577. For common footprints, with no overhang and 10% extra on the shingles:

Roof area and shingles at 7/12
FootprintRoof areaSquaresBundles with 10% extra
1,000 sq ft1,158 sq ft11.639
1,500 sq ft1,737 sq ft17.458
2,000 sq ft2,315 sq ft23.277
2,500 sq ft2,894 sq ft28.996
3,000 sq ft3,473 sq ft34.7115

Rafter length at 7/12

Each foot of run adds 13.89 inches of common rafter, or 1.5298 ft of hip or valley rafter per foot of common run. For some typical runs, measured to the ridge centerline:

Rise and common rafter length at 7/12
RunRiseRafter length
4 ft2 ft 4 in4 ft 7⅝ in
6 ft3 ft 6 in6 ft 11⅜ in
8 ft4 ft 8 in9 ft 3⅛ in
10 ft5 ft 10 in11 ft 6⅞ in
12 ft7 ft 0 in13 ft 10¾ in
14 ft8 ft 2 in16 ft 2½ in
16 ft9 ft 4 in18 ft 6¼ in

Roofing materials at 7/12

Shingles and metal both work. For its TimberSteel metal roofing, GAF notes that a slope over 6:12 may affect walkability because the product can be slippery when wet.

Can you walk a 7/12 roof?

OSHA classes any roof over 4 in 12 as steep. At 7/12 you should not count on simply walking it: GAF notes, for its metal roofing, that slopes over 6:12 may affect walkability. Use fall protection and, if in doubt, hire a roofer. This is general information, not safety advice.

Frequently asked questions

What angle is a 7/12 roof pitch?

30.26 degrees, a 58.3% slope.

What is the multiplier for a 7/12 roof?

1.1577. Multiply the footprint area by it to get roof area. The hip/valley factor is 1.5298.

How much roof area does a 7/12 pitch add?

15.8% over the footprint. A 2,000 sq ft footprint becomes 2,315 sq ft of roof, 23.2 squares.

Is 7/12 a steep roof?

By OSHA’s definition, yes: anything over 4 in 12 is steep for fall-protection rules. GAF puts most US homes between 4:12 and 9:12.

How much does a 7/12 roof rise over a 12-foot run?

7 feet. Over a 12-foot run the roof climbs 7 feet, which is 13 ft 10¾ in of rafter along the slope.

Other roof pitches

Related

Other roofing calculators

Sources