Roof Area Formula

Area cos roof angle pi 180 area is the value of the area measurement.

Roof area formula.

The answer to this is the total number of squares on your roof for which you need to purchase shingles. Clear the show caption check box. The roof area for a hip end is the same as for a gable end the intersection is equivalent to a hip slightly conservative so there is usually no need to consider triangles when measuring a roof. Multiply your house length by your house width to get the area.

We used this detail to calibrate our folding carpenter s rule scale for reading roof slope from the ground. 6 calculate the total surface area of the roof using the following formula. Explanation of the formula. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

Which is the same as saying a 45 degree slope a 12 in 12 slope or the roof will rise 12 for every 12 of horizontal run. The roof area is calculated. Divide the area you calculated in step 4 by 100. 1 200 x 1 05 1 260 square feet to allow for hips ridges and waste add 10 of your final number for a gable roof and 17 of your final number for a cottage roof.

Measure the length of the rafters from the peak to the lower edge. To accurately calculate the area of your roof you must first determine its slope or pitch. Right click on the area measure then click properties. Select the area measure.

In the construction industry roofs are measured in squares one square equals 100 square feet. Tan 45o 1 00. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. You may want to hide the display of the area value in the plan view to avoid confusion.

Pi times the radius times the rafter length also. Roof angle is the value in the user defined. Details of that procedure are at roof measurements. Roof pitch is given as the number of inches in height change over the distance of one foot.

For example 40 feet x 30 feet 1 200 square feet next multiply the area by your roof s pitch. Divide your roof pitch by 12.