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Use the calculator above for exact measurements with your specific overhang and beam dimensions.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Tips for Accurate Roof Framing","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Always add extra length.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Buy lumber at least one size longer than your calculated rafter length. You'll need material for the plumb cut at the ridge and the tail cut at the overhang. A 13 ft 6 in rafter means you're buying 16-footers, not 14-footers.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Double-check with a test rafter.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Before cutting all your lumber, cut one test rafter and hold it in place. Verify that the ridge height, bird's mouth seat, and overhang all line up. Five minutes of testing saves an hour of re-cutting.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Account for the bird's mouth.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" The bird's mouth cut (the notch where the rafter sits on the wall plate) reduces the effective depth of the rafter at the bearing point. Make sure you're not cutting more than one-third of the rafter depth, or you'll weaken the structural connection.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Mark your measurements in the builder's fraction.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Construction measurements use fractions — 1/16, 1/8, 1/4, and so on. Converting a decimal like 13.42 feet to feet and inches (13 ft 5 in) prevents errors when you're marking lumber with a tape measure.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Factors That Affect Your Rafter Length","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Building width","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" is the biggest factor. Every additional foot of building width adds roughly 6-8 inches of rafter length depending on your pitch.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Roof pitch","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" has a multiplying effect. Going from a 4/12 to an 8/12 pitch on a 24-foot building adds about 3 feet to each rafter — that's significant when you're pricing lumber for 30+ rafters.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Overhang length","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" adds directly to the rafter run. Most building codes require at least some overhang to protect the wall from water, and many homeowners prefer 18-24 inches for rain protection and shade.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Ridge beam size","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" has a small but real effect. If you're using a 3.5-inch engineered beam instead of a 1.5-inch dimensional board, each rafter run shortens by an extra inch — which adds up across the full roof.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}},"id":"69a86cbb26a1b30004a59f91"}]}]}],"$L35"]}],"$L36"]}]]}]}]}]
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35:["$","div",null,{"className":"bg-white rounded-lg shadow-sm p-8","children":[["$","h2",null,{"className":"typo-large mb-6 text-mist-950","children":"Frequently Asked Questions"}],["$","div",null,{"className":"space-y-6","children":[["$","div","0",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How do I calculate rafter length from roof pitch?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Multiply half the building width by the slope factor for your pitch. For a 6/12 pitch (slope factor 1.118) on a 24-foot building: (24 ÷ 2) × 1.118 = 13.42 feet. Then add the overhang length multiplied by the same slope factor.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","1",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What size rafter do I need for a 20-foot span?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"For a 20-foot span with a standard 6/12 pitch, your rafters will be about 12 feet 6 inches long. As for lumber dimension, most residential roofs use 2×8 or 2×10 rafters for 20-foot spans, but the required size depends on your local building code, snow load, and rafter spacing (16 or 24 inches on center).","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","2",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What's the difference between rafter length and rafter run?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Rafter run is the horizontal distance from the outside of the wall to the center of the ridge board. Rafter length is the actual sloped distance along the rafter — it's always longer than the run because the rafter is angled. Think of run as the base of a triangle and rafter length as the hypotenuse.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","3",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How do I find my existing roof pitch?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Place a level horizontally against the underside of your rafter and measure 12 inches from the rafter. Then measure straight down from the 12-inch mark to the rafter. That vertical measurement is your pitch. If it's 6 inches, you have a 6/12 pitch.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","4",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Does overhang affect rafter length?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Yes. Overhang adds to the total rafter run, which increases the overall rafter length. A 12-inch overhang on a 6/12 pitch adds about 13.4 inches of actual rafter length. A 24-inch overhang on the same pitch adds about 26.8 inches. Always include overhang in your calculation.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],"$L37","$L38","$L39","$L3a","$L3b"]}]]}]
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37:["$","div","5",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What's the minimum roof pitch for asphalt shingles?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Most shingle manufacturers require a minimum 4/12 pitch (sometimes written as 2/12 with special underlayment). Below 4/12, water doesn't shed fast enough and can work under the shingle tabs, causing leaks. For pitches under 4/12, use rolled roofing, membrane, or metal panels.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
38:["$","div","6",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How much longer are hip rafters than common rafters?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Hip rafters run diagonally from the ridge to the corner of the building, so they're longer than common rafters. Multiply your common rafter run by the hip/valley factor (1.414 for equal-pitch roofs) and then by the slope factor to get the hip rafter length.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
39:["$","div","7",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Can I splice rafters if they're too long for standard lumber?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Yes, but splices must occur over a bearing point or be properly engineered. For residential construction, most codes require a splice plate nailed on both sides with a specific nailing pattern. If your calculated rafter length exceeds 20 feet, consider engineered trusses instead — they're often more economical and structurally consistent for long spans.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3a:["$","div","8",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What is a slope factor and how do I use it?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The slope factor (also called the rafter factor or secant of the roof angle) is a multiplier that converts horizontal distance to sloped distance along the rafter. For a 6/12 pitch, the slope factor is 1.118 — meaning every 12 inches of horizontal run becomes 13.42 inches of actual rafter length. Multiply your total run by the slope factor to get the rafter length without doing the full Pythagorean calculation.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3b:["$","div","9",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How does beam thickness affect rafter length?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L32",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The ridge beam sits at the peak where rafters from both sides meet. Since each rafter butts against the beam, you need to subtract half the beam thickness from each rafter's run. A thicker beam (like a 3.5-inch engineered beam) shortens each rafter by about an extra inch compared to a standard 1.5-inch ridge board. It's a small adjustment, but skipping it means your rafters will be slightly long, forcing the ridge board higher than planned.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
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