1 8 Roof Factor

20 x 12 scale factor 240.

1 8 roof factor.

The pitch fraction represents a certain amount of vertical rise over the entire span. Then multiply the square footage with the roof pitch factor to get the total area of the roof. Set the level on the edge of the speed square as shown below then place the heel of the speed square on a rafter or gable edge of the roof. That is if your tape reads 7 then add 1 that will give you 8 12.

Select the desired scale. 1 8 1 0 invert the fraction and multiply by 12. A roof that rises 8 feet over a 24 foot span was said to have a 1 to 3 pitch. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.

Select the desired scale. 1 20 multiply the feet by 12. For example given a roof with. Image 1 12 to 12 12 roof pitch 7 12 pitch.

To convert an architectural drawing scale to a scale factor. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. Valley hip factor. For example if you measure 4 inches the pitch of your roof is 4 12.

For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. To convert an engineering drawing scale to a scale factor. 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.

Roof pitch degree table. Measure with a speed square. A speed square and level can be used to easily find the pitch of a roof. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof.

8 1 x 12 scale factor 96. The maths behind this number is that it is the square root of rise run 2 1. The pitch of this roof is 4 8 12. The calculator above can handle much of this math.

This will give you the rise over run or pitch.