Roof Area Formula

In the construction industry roofs are measured in squares one square equals 100 square feet.

Roof area formula.

Tan 45o 1 00. We used this detail to calibrate our folding carpenter s rule scale for reading roof slope from the ground. Roof angle is the value in the user defined. 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.

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. Pi times the radius times the rafter length also. Right click on the area measure then click properties. Select the area measure.

Area cos roof angle pi 180 area is the value of the area measurement. You may want to hide the display of the area value in the plan view to avoid confusion. Explanation of the formula. 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.

Dividing by 12 gives the ratio of inches in rise per distance. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Clear the show caption check box. Measure the length of the rafters from the peak to the lower edge.

The roof area is calculated. Details of that procedure are at roof measurements. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The answer to this is the total number of squares on your roof for which you need to purchase shingles.

Divide your roof pitch by 12. For example 40 feet x 30 feet 1 200 square feet next multiply the area by your roof s pitch. 6 calculate the total surface area of the roof using the following formula. The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials.

Multiply your house length by your house width to get the area. Divide the area you calculated in step 4 by 100.