How To Find Roof Slope Factor

Multiply the result by the factor and this is the length of the roof from base to ridge.

How to find roof slope factor. Multiply the roof length by the gable wall length 40 24 960. Use a level against the underside of the rafter you re measuring to get the most accurate value. Roof length including overhangs 40. Place your extension ladder against the roof.

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. The roofing material should look dry and intact. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Gable wall length including overhangs 24.

How do you calculate the slope of a roof. How to determine roof slope factor 1. Enter 6 into the calculator slope factor 1 1180. The most precise way to find the roof s slope is by measuring it from the underside.

Multiply this amount by the slope factor 960 1 1180 1073 28. Locate the level s 12 inch mark. Climb up the ladder and onto the. 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.

Use the factor instead. Access one of the rafters then take. Measure from an exterior wall to an exterior wall and divide by two. Hold out your arms and hands perpendicular to the ground as you stand.

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. 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.