ES

5/12 Roof Pitch

A 5/12 pitch rises 5 inches for every 12 inches of run: 22.62°, a 41.7% slope and a multiplier of 1.083.

I know the

Roof pitch

5/12 pitch

22.6° · 41.7% · ×1.083

5/12 is 22.62°, a 41.7% slope, and the roof is 8.3% larger than its footprint.

  • Angle22.62°
  • Percent slope41.7%
  • Pitch multiplier1.0833
  • Hip and valley factor1.4743
  • Rafter per foot of run13.00 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 5/12 pitch looks like

At 5/12 the roof is a moderate pitch, comfortably inside the 4:12 to 9:12 range GAF says covers most US homes. The roof rises 5 inches for every 12 inches of run. That is a 22.62° angle, a 41.7% slope and a roof surface 8.3% larger than its footprint.

Roof area at 5/12

Multiply the footprint by 1.0833. For common footprints, with no overhang and 10% extra on the shingles:

Roof area and shingles at 5/12
FootprintRoof areaSquaresBundles with 10% extra
1,000 sq ft1,083 sq ft10.836
1,500 sq ft1,625 sq ft16.354
2,000 sq ft2,167 sq ft21.772
2,500 sq ft2,708 sq ft27.190
3,000 sq ft3,250 sq ft32.5108

Rafter length at 5/12

Each foot of run adds 13.00 inches of common rafter, or 1.4743 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 5/12
RunRiseRafter length
4 ft1 ft 8 in4 ft 4 in
6 ft2 ft 6 in6 ft 6 in
8 ft3 ft 4 in8 ft 8 in
10 ft4 ft 2 in10 ft 10 in
12 ft5 ft 0 in13 ft 0 in
14 ft5 ft 10 in15 ft 2 in
16 ft6 ft 8 in17 ft 4 in

Roofing materials at 5/12

Standard shingle installation applies. Metal Sales lists 3:12 as the minimum for its residential metal profiles, so metal roofing works at this pitch.

Can you walk a 5/12 roof?

OSHA classes any roof over 4 in 12 as steep, so 5/12 is steep for fall-protection rules. How walkable it feels depends on the surface, moisture and footwear, so plan for anchors and proper shoes. This is general information, not safety advice.

Frequently asked questions

What angle is a 5/12 roof pitch?

22.62 degrees, a 41.7% slope.

What is the multiplier for a 5/12 roof?

1.0833. Multiply the footprint area by it to get roof area. The hip/valley factor is 1.4743.

How much roof area does a 5/12 pitch add?

8.3% over the footprint. A 2,000 sq ft footprint becomes 2,167 sq ft of roof, 21.7 squares.

Is 5/12 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 5/12 roof rise over a 12-foot run?

5 feet. Over a 12-foot run the roof climbs 5 feet, which is 13 ft 0 in of rafter along the slope.

Other roof pitches

Related

Other roofing calculators

Sources