eg: Half building width minus 1/2 ridge thickness. Step 4 Place the framing square against the bottom edge of the rafter, aligning the pitch measurement on the outside edge of the shorter, narrower arm of the square, called the "tongue," with the edge of the board. This calculator is … Input the rafter span (on the flat), eave overhang and pitch of the roof. Next, enter the length and height of the wall into the framing calculator. The calculation sequence to find rafter length on a Construction Master is shown below. Stud Spacing. On a full gable roof, this is equal to half the building width minus half the ridge thickness. Select the following information by using the drop downs to … Ok first off i want to say i do not use a construction calculator at all. Structures such as sheds or barns can be frames with rafters every 24." Again, make sure to consult local codes. Wall Dimensions. Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. Studs are usually spaced at 16″ (traditional framing) or 24″ (advanced framing). If your project had a rafter length of 8' or less, a safe and strong method is to use 2x8 framed 16" on center. Print full scale Rafter Cut Templates and Birdsmouth Templates Fold template over rafter to mark or cut through. See Rafter Run to Outer Wall Calculator below. On construction calculators, slope is often called “pitch.” Rafter run is the horizontal distance the rafter travels. Laying out hip, valley, and jack rafters takes experience and skill, but if you’re building a simple gable or shed roof, all you need is the common rafter, the basic building block of roof framing.. To lay out a common rafter, you need the pitch of the roof, expressed in units of rise per foot of run.In the gable-roof example shown here, a rafter with 6-in-12 pitch rises 6 in. The process will generally be the same for a shed of any moderate size, but be sure to use the rafter sizing calculator above to find the correct rafter length and size for your shed rafter project. I’ve seen some arguments above on what to subtract for a ridge. Calculating Rafter Length. Check the chechbox to the right of the kneewall field to enable kneewalls and enter the distance from the outside edge of the wall to the face of the kneewall. The hip roof framing calculator returns the value of the main rafter, the side rafter, the length of the hip, the height of the knee wall, and the lengths of the jack rafters. How to Use the Hip Roof Framing Calculator. For example say my span is 300″, i would take 300″-1.5″/2 which gives you a run of 149.25″. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths. The way i prefer is to pull my span outside/outside the walls the rafter are sitting on. 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