How long rafters

Lean-to Roof Metric. Gambrel Metric. Rafters Metric. Soffit Drop. Bullnose Roof. Square Tail Fascia. Hip Roof Sheet Cuts. Rafter Run to Outer Wall.

Enter the value for the roof width outside to outside in feet, inches, and fraction, inches and fraction, or use the inches box to enter a value in decimals if that is your preference. See the detailed instructions below for any further questions. The results are automatically fired as soon as any of the values are entered or altered. The next result is the run.

This is the horizontal measurement from the outside of the wall to the inside of the ridge. Then the rise is the vertical measurement from the top of the rafter on the outside edge of the plumb cut on the notch. This is also known as the HAP height above plate. The scaffold is a value in inches that represents the vertical distance from the top of the HAP to the top of the walk board.

The top of a a rafter usually joins a ridge. The miter is simply a plumb cut. There must be no gaps in the precision of the fit. If there is a noticeable gap, then it should be a red flag for investigation.

Once you know your slope factor, simply multiply it by the run of your roof to work out the size of your rafters. Using the previous example, if your run was 2. Again, if necessary, add the length of your rafter feet to this number to get your final measurement. Now that your rafter length has been calculated, you can start to plan out the rest of your project and order your roofing supplies. Posted: January 16, Categories: Roofing Guides. Apps There are a number of apps you can use to calculate roof pitch.

Dedicated Tools There are a number of low-cost tools out there which can help you determine the pitch of your roof. Next Steps Now that your rafter length has been calculated, you can start to plan out the rest of your project and order your roofing supplies. Recent Posts. November October September Start by deciding what you want the calculations to be based on.

You can choose the rise of the roof which is its height or the roof pitch which is the slope created by the rafter. If you want to learn more about the way it's calculated, check out our roof pitch calculator.

Please note that the rafter length calculator works both ways, that is, you can also use it to calculate the rise or the run! If you already know the rafter length and want to figure out any of the other dimensions, simply input the two you know, and you will get the third one. If you decided to include roof pitch in your calculations, you will need to input the run and the pitch of the roof to get the rafter length.

After doing that, you will see the rafter length in the bottom-most field. Here as well, our calculator works both ways.

You can input any of the two values to get the third one calculated. You can input roof pitch in whichever format you prefer angle , percentage , ratio , and our tool will automatically tell you the other ones. Input the roof length , the on-center spacing the distance between the middles of two neighboring roof trusses and the rafter calculator will return the number of roof trusses needed.

Our tool can also figure out the approximate roof truss cost. In the appropriate fields of the calculator, decide whether you want to include the cost of installation in the calculations. If you pick No , the only thing left to input is the cost of a single roof truss. The rafter length calculator will return the total expenses in the bottom-most field.