How To Find Roof Slope Factor

Once you know the roof slope multiplier for a particular slope you can use it to find the actual area of any size sloped roof.

How to find roof slope factor.

You want to find out how much longer that length is than the 12 inches and express the difference as a number the roof slope factor also called the roof slope multiplier roof pitch factor or roof pitch multiplier. Gable wall length including overhangs 24. The area of this roof 1073 3 sq. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

Multiply this amount by the slope factor 960 1 1180 1073 28. Multiply the result by the factor and this is the length of the roof from base to ridge. How to determine roof slope factor 1. The most precise way to find the roof s slope is by measuring it from the underside.

How do you calculate the slope of a roof. Measure from an exterior wall to an exterior wall and divide by two. Access one of the rafters then take. Use the factor instead.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Place your extension ladder against the roof. Multiply the roof length by the gable wall length 40 24 960. Hold out your arms and hands perpendicular to the ground as you stand.

Climb up the ladder and onto the. Enter 6 into the calculator slope factor 1 1180. Roof length including overhangs 40. The roofing material should look dry and intact.

Use a level against the underside of the rafter you re measuring to get the most accurate value. You don t have to climb a ladder and place a tape measure on the ridge and measure down to the base to find the length of the roof.