Determination of the roof slope and pitch is important in order to accurately calculate the area of your roof. Roof pitches are usually defined in terms of rise and run. The run is the distance from the outside edge of a perimeter stud wall to the house center. The rise is the distance from the top of a stud wall to the peak of the roof. You will know the roof’s pitch by knowing how much it rises for every foot it runs.
To calculate the roof pitch, you will need a level and a tape measure or ruler. Start by marking the level 12 inches from one end. On a ladder beside the roof, you will need to place the level a foot up and measure from the 12 inch mark on the bottom straight down to the roof. If the measure is 4 inches, you will have a 4 in 12 pitch.
Another method to find out the measurement of your roof pitch is through attic, by placing the level against the rafter with the 12-ince mark on the bottom of the rafter. You will get the roof’s rise by measuring from the end of the level up to the bottom of the rafter edge.
If the roof of the home or building is flat or has no more than a 3 in 12 pitch, calculation of the total square footage can be done by multiplying the length by the width and round it to the nearest foot. By adding in the nominal roof size and the specific roof pitch into the roofing cost calculator, you will be provided with an estimate of the total cost.