![]() ![]() As such, while it can be cumbersome, measuring the area and pitch of each part of the roof and multiplying by the corresponding correction factor will result in the most accurate estimate of necessary roofing materials. While it is possible to estimate the amount of necessary materials using only the total roof area measurement, as can be seen from the table, depending on how large the pitch of the roof, the actual area of the roof can differ by up to 2.236 from the measured total area at a pitch of 24/12. Given pitch and a horizontal area measurement, multiply the horizontal area by a correction factor corresponding to pitch, provided in the table below, to determine the actual area of the roof to be used in the Roofing Material Calculator. Depending on whether the roof area is measured horizontally (possibly from a drawing or photograph), a correction factor is necessary to determine the actual area of the roof. Roof pitch affects the actual area of the roof. It affects walkability as well as drainage, and roofs in areas of high rain or snowfall tend to have steeper pitches. Roof pitch is a determining factor for the cost of the roof, as well as the roof area, and the type of materials used. Example: For instance, if you have a rafter span of 20 feet, a snow load of 30 psf, and a roof pitch of 6 in 12, input these values, click Calculate, and the result. Click the Calculate button to get the recommended ridge beam size in inches instantly. Outside of the U.S., a degree angle is typically used. Enter the roof pitch in inches per foot (in 12) in the appropriate input field. For instance, a 7/12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. In the United States, a run of 12 inches (1 foot) is used, and pitch is measured as the rise of the roof over 12 inches. It is often compared to slope, but is not exactly the same. Roof pitch is the measurement of a roof's vertical rise divided by its horizontal run. Although ceramic tile roofs are expensive, they can have a life span of over 100 years. Shingle roofs typically have a life span of 15-30 years, while membrane roofs usually last 5-15 years. The most common roofing materials used in the United States include shingles, membrane roofing, and ceramic tile, all of which have different life spans. Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the Roofing Material Calculator. The Area Calculator can be used to calculate the area of a variety of simple shapes that together can comprise the area of the roof. The calculator cannot account for complex shapes based on a measurement of square footage alone. In cases where a roof has a complex shape, such as in the image to the right, measuring the dimensions and areas of each part of the roof to calculate the total area will result in a more accurate measurement of area. All my calcs are performed in Decimal Feet (on a different sheet.The calculated area is only an estimation. ![]() I think I posted the "text" in a forum discussion somewhere, CT or JLC. I had to edit it to round down to 16ths instead of 128ths. I found a VB module online that I copied and pasted into my workbook that converts a "Lentext" string into decimal feet. Lookup the "Lentext" function, might be useful. Using hidden sheets will help hide calcs that can be and keep the cell functions shorter. Excel doesn't like equal signs inserted after the initial =() in the formula. (Btw, Irregular overhangs should be calculated from the outside of the fascia.) Pretty obvious that the overhangs aren't equal. This was my first attempt to add a couple of extra features, equal overhangs, take-off, and some other stuff. I see your graphing calculations found a couple of mistakes. I was mistaken about it being my latest greatest version. I posted the screenshot to help inspire you with creating your Roof Framing Calculator. ![]() One thing is for sure, creating a good SS will increase your knowledge of Conventional Roof Construction. (I don't know if I'll ever get that far with it though. I have also been working on a sheet that would be used to "Describe" the roof and the other sheets would take that info and generate Area Cut Lists and Roof Lumber Material Lists. Right now it take manual counts of quantities of specific Rafters to compile the material list. This is the input page, There is a print page too, and a hidden page that performs all the trig functions in decimal form, sends the results back to this page and reconverts to Imperial. ![]() If you see a Calc error, please point it out. Eliminates diamond cuts on the Ireg Hips, and no bevels beyond 56*, (limit of cheap DeWally circ saws)) *(Calculates for the way I like to lay out the Ireg Roof. Here is a screen of the latest version of my "Irregular" SS calculator I've been working on. ![]()
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