Conclusions about the roof rafter length calculator.

Wall thickness – It is important to take into account the overall thickness of the exterior wall. Here are the sizes we plan to use to hopefully prevent sagging: 8” x 8” Posts . Ok. (In our example showing a 13’x19′ Big Kahuna attached pergola, this calculation would be: 11’6″+ 1’6″= 13′ = Rafter Length of 13 feet). You can either get these measurements directly, by going up on your roof, or indirectly, by using your house footprint as a proxy for the variables. 3” x 8” Knee Braces . eval(ez_write_tag([[300,250],'myrooff_com-banner-1','ezslot_5',121,'0','0']));Inputs for rafter length calculator. In this case, that number is 15. In addition, using the “Rafters” diagram, you can see the precise dimensions of the roof rafter (including length) from every possible angle.

Calculating rafter length starts with a few basic inputs that you will need to gather before using this tool. Here, the number is 941.86 inches. Here, you can see how each of the five inputs above were figured: Once all of these inputs have been entered into the calculator, you will see that the appropriate rafter width is 120.33 inches. 3” x 10” Rafters . Span Calculator for Wood Joists and Rafters also available for the Android OS. Here, the wall thickness is 240.57 inches. These are the inputs that you will need (all of them measured in inches): eval(ez_write_tag([[300,250],'myrooff_com-leader-1','ezslot_11',123,'0','0']));By entering these inputs into the rafter length calculator, you will get a final number, which is the rafter size. also available for the Android OS. Roof rise – This should be calculated from the base of the roof to the highest point of the roof gable (the peak). Here, the number is 1166.66 inches. 2” x 6” Shade Planks . This is a heavy roof, so the 1200 mm column on the right side of the table is excluded – it only applies to light roofs. To calculate your Rafter Length for an attached pergola, it is Measurement A + 1’6″.

Here, the overhang is 320.13 inches.

Once all of these inputs have been entered into the calculator, you will see that the appropriate rafter width is 120.33 inches. Using this number, you will know exactly how much timber you will need. So we increased the size of the Pergola to 18' x 18' with the 12 spoke rafters. Take note of this measurement, as this will be the first number in the size pergola you choose. 4” x 12” Beams . …

Once you know the appropriate lengths, you will be able to determine the total cost of your roof project.

Example of figuring rafter lengtheval(ez_write_tag([[300,250],'myrooff_com-large-mobile-banner-1','ezslot_13',124,'0','0'])); For first-time homeowners, some of these roof inputs might not be immediately obvious, so let’s work through a hypothetical example based on the “General View” diagram. Birdsmouth plumb – If you study the diagram carefully, you will see that there is an indentation in the roof rafter where it meets the exterior wall of the building. Here, the birdsmouth plumb is 76.37 inches.

The actual indentation or cut is known as the “birdsmouth,” while the birdsmouth plumb is the depth of the cut out.

Obviously, the results will be more accurate if you can measure directly.

Light Polycarbonate roofing . And by getting the prices of wood from your local home improvement store, you will know the exact cost of your roof project.

Here, the wall thickness is 240.57 inches. The layout of your home or building will have a significant impact on the final design and slope of your roof. Overhang – The overhang should be measured from the outer edge of the exterior wall to the furthest point of the rafter. Rafter run outer wall – This should be measured starting from the center of the roof span, and then extending to the very edge of the exterior wall. Choose rafter spacing from Table 10.1 – the options are 480, 600 or 900 mm. So for a pergola that is 20 feet wide, you would convert that number to inches–in this case that comes out to 240 inches–then divide it by 16 to get the total number of rafters needed. Using this handy online tool, you will have an easy way to determine and figure out the specific rafters needed for the unique slope and dimensions of your roof. Beam size for long span on pergola decks fencing contractor talk what is max distance between posts using 2x12x20 foot beams for a pergola beam span calculator pergolainstructions key 5413352419 pergola beam span calculator pergolaforcarport span tables for 8 x12 x24 western red cedar this pergola measuring pergola dimensions learn the standard. If you are making repairs to your roof or installing a completely new roof, you will need a rafter calculator to help you figure out rafter lengths.

In addition, using the “Rafters” diagram, you can see the precise dimensions of the roof rafter (including length) from every possible angle. eval(ez_write_tag([[300,250],'myrooff_com-large-leaderboard-2','ezslot_10',122,'0','0']));The good news is that there are some common inputs that can be used for any roof, no matter its dimensions, angle, or shape.