Brands: Black Hawk - Premium Grade; clear heartwood, 100% edge grain Green River - Number 1 Grade Select; Select 2-pack, maximum 20% flat grain Scott Cedar - Number 1 Grade; 20% flat grain Lengths: 24", 18". Thickness: ½" (medium), ¾" (heavy), 1¼" (jumbos), minimums. Width: Random, 4" minimum, 14" maximum. Roof Pitch: 4:12 minimum.(lower slopes require special application) Brands: Green River Grades Premium Grade; clear heartwood, 100% edge grain Number 1 Grade; clear heartwood, maximum 10% flat grain Number 2 Grade; lower half is clear, flat and cross grains allowed, tight knots and defects allowed in upper half Lengths: 24", 18" Thickness: 5/8" (medium, ½" on number 2 grades), ¾" (heavy), minimums Width: Random, 4" minimum, (3" on number 2 grades) 14" maximum Roof Pitch: Roof pitch: 4:12 minimum (lower slopes require special application)