What is 8:12 in degrees?

A 8:12 roof pitch equals 33.7° — the roof rises 8 inches for every 12 inches of horizontal run. As a grade that is 66.7%, and the pitch (slope) factor used for area is ×1.202.

What roofing materials can I use on a 8:12 roof?

At 8:12, the materials that meet their minimum-slope requirement are: Membrane (TPO / EPDM / built-up); Standing seam metal (mechanically seamed); Asphalt shingles (low-slope method); Clay / concrete tile; Exposed-fastener / metal shingles; Wood shakes & shingles; Asphalt shingles (standard); Natural slate. That is a code-minimum list, not a recommendation — low-slope membranes, for example, are rarely chosen for a roof this steep. See the recommended materials above, and always confirm against the product's installation instructions and local code.

How much more material does a 8:12 roof need than a flat roof?

About 20.2% more surface area than the flat footprint, because the slope lengthens every plane. Multiply your footprint area by ×1.202 to get the true roof surface area.

8:12 Roof Pitch

8/12 is a classic steep pitch with strong architectural presence — the go-to for colonial, Cape Cod, and traditional Northeast homes.

🏠 Standard Pitch

Pitch Ratio

8:12

Angle

33.7°

Slope (grade)

66.7%

Pitch Multiplier

×1.202

Walkability

Difficult — experienced only

Steep enough that most people should not walk it unaided. Roofers use roof jacks, toe boards, and fall protection here.

🏠 Common Uses for 8:12 Pitch

•Classic colonial and Cape Cod styles
•New England traditional homes
•Cottage and farmhouse designs
•Homes in heavy snow zones

🌦️ Best Climate Fit

•Heavy snow regions (New England, Rocky Mountains)
•High rainfall areas
•Northern climates where snow load is a concern

✅ Advantages

✓Classic, timeless architectural look
✓Excellent snow and rain shedding
✓Longer roof lifespan due to better drainage
✓Substantial attic/living space potential
✓Can handle most premium materials

⚠️ Drawbacks

×Definitely not walkable — requires scaffolding for repair
×20-25% higher cost than 4/12 (more materials + labor)
×Higher wind uplift exposure
×Requires experienced roofers

🧱 Recommended Materials for 8:12

Asphalt ShinglesArchitectural ShinglesStanding Seam MetalClay TileSlateWood Shakes

Material Compatibility at 8:12

Code-typical minimum slopes (IRC R905 / manufacturer specs). Confirm against your product and local code — see the methodology.

✓Membrane (TPO / EPDM / built-up) — min 0.25:12
✓Standing seam metal (mechanically seamed) — min 0.5:12
✓Asphalt shingles (low-slope method) — min 2:12
✓Clay / concrete tile — min 2.5:12
✓Exposed-fastener / metal shingles — min 3:12
✓Wood shakes & shingles — min 3:12
✓Asphalt shingles (standard) — min 4:12
✓Natural slate — min 4:12

About 8:12 Pitch

A 8:12 (also written as 8/12) roof pitch means the roof rises 8 inches for every 12 inches of horizontal distance. Expressed as an angle, this is approximately 33.7 degrees, with a slope of 66.7%.

Asphalt shingles (most popular), architectural shingles, or wood shakes. Standard residential pitch range.

Compared to a flat roof of the same footprint, a 8:12 pitch roof has about 20.2% more surface area due to the slope. Use our roof area calculator to convert your footprint to actual roof surface, or go straight to shingle and cost estimates with a pitch multiplier of ×1.202.

8:12 Pitch FAQ

What is 8:12 in degrees?: A 8:12 roof pitch equals 33.7° — the roof rises 8 inches for every 12 inches of horizontal run. As a grade that is 66.7%, and the pitch (slope) factor used for area is ×1.202.
Is a 8:12 roof walkable?: Difficult — experienced only. Steep enough that most people should not walk it unaided. Roofers use roof jacks, toe boards, and fall protection here.
What roofing materials can I use on a 8:12 roof?: At 8:12, the materials that meet their minimum-slope requirement are: Membrane (TPO / EPDM / built-up); Standing seam metal (mechanically seamed); Asphalt shingles (low-slope method); Clay / concrete tile; Exposed-fastener / metal shingles; Wood shakes & shingles; Asphalt shingles (standard); Natural slate. That is a code-minimum list, not a recommendation — low-slope membranes, for example, are rarely chosen for a roof this steep. See the recommended materials above, and always confirm against the product's installation instructions and local code.
How much more material does a 8:12 roof need than a flat roof?: About 20.2% more surface area than the flat footprint, because the slope lengthens every plane. Multiply your footprint area by ×1.202 to get the true roof surface area.

Estimates only. See how this calculator works — the formulas, assumptions, and sources behind it.

Cost Impact of 8:12 Pitch

A clear step up in cost. The roof area is 20% larger than the footprint, and labor becomes more demanding — roofers typically need roof jacks, scaffolding, or harness systems. Material cost increase is straightforward (20% more area = 20% more material), but the labor premium can add another 10-20% on top.

Building Code Notes

8:12 typically requires fall protection in most jurisdictions. Many roofing warranties are unaffected at this pitch, but check manufacturer specifications — some warranty terms change above 8:12. Attic ventilation calculations should account for the increased air volume.

Calculation Example

For a 30×50ft home (1,500 sqft footprint) at 8:12: roof area = 1,500 × 1.202 = 1,803 sqft, about 18 squares. The same house at 6:12 would be 1,677 sqft — the steeper pitch adds 126 sqft and roughly 4 extra bundles of shingles.

Open calculator with 8:12 pitch → · Estimate replacement cost →