Width or Span is the gable side of the roof, which is used in calculating rafter length and cost. Refer to this chart for more detailed rafter-spacing information: Keep in mind that youll always need an even number of rafters. If you are building an extension you will probably need to match it with the existing soffit size of the main building. The Bow should always be on the uppermost side of the rafter so that when the weight of the roof tiles goes on it will more likely straighten the rafters out than bow them down even more. Anything over that presents several options for making the cuts fit proper into the hip or valley. Easy Rafters does not calculate a complete four sided hip roof, but rather calculates the common, hip, and jack rafters for one end of a hip roof. Also, they will both add up to 90 (a right angle triangle is 90). How Do I Figure Out How Many Rafters I Need? The rafter length calculator will return the total expenses in the bottom-most field. Green River Carpentry ProgramBasic Rafter Design and Framing Course Unit 3 Video 1 Hip and Jack Rafter Calculations All you need is paper, a pencil, and a scientific calculator. Cause even I still have questions about things and Ive been doing this for a while now. ), Thickness of the ridge (Find this on the materials list or in the yard), Roof pitch for the main rafters (Find this on the blueprints), Roof pitch for the side rafters (Find this on the blueprints), Width of the cornice (do not include wall sheathing unless the rafter span and the birds mouth include it), Run of the common rafter (Use this measurement to determine where the side rafter sits), Rise of the common rafter (Use this to calculate a ridge prop and scaffold height; remember to include the HAP), Length of the common rafters (This is measured from long to short on the top of the rafter), Difference in HAP (This is the difference in heights at the HAP of the common and side rafter), Run of the side rafters (Use this to determine where the common rafters stop on the main walls), Length of the side rafters(This is measured from long to short on the top of the rafter). You can choose the rise of the roof (which is its height) or the roof pitch (which is the slope created by the rafter).
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