1 8 Roof Factor

A roof that rises 8 feet over a 24 foot span was said to have a 1 to 3 pitch.

1 8 roof factor.

The calculator above can handle much of this math. 1 8 1 0 invert the fraction and multiply by 12. That is if your tape reads 7 then add 1 that will give you 8 12. 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.

The headache of using pythagoras and trigonometry can be spared by making use of these charts. The maths behind this number is that it is the square root of rise run 2 1. For example the roof layer that protrudes above the roof is 1 so add 1 to your tape reading. 20 x 12 scale factor 240.

The pitch fraction represents a certain amount of vertical rise over the entire span. For example if you measure 4 inches the pitch of your roof is 4 12. Valley hip factor. The pitch of this roof is 4 8 12.

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. Then multiply the square footage with the roof pitch factor to get the total area of the roof. Roof pitch degree table.

Select the desired scale. This will give you the rise over run or pitch. 8 1 x 12 scale factor 96. 1 20 multiply the feet by 12.

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

Measure with a speed square. To convert an architectural drawing scale to a scale factor. The roof slope factor chart also consists of conversion factors to determine the slope 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.

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.