1 8 Roof Factor

If the rise is 4 feet over a 24 foot span then the roof pitch was said to be 1 to 6 the pitch can be expressed numerically as a fraction.

1 8 roof factor.

8 1 x 12 scale factor 96. Valley hip factor. Measure with a speed square. 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.

For example if you measure 4 inches the pitch of your roof is 4 12. To convert an engineering drawing scale to a scale factor. Roof pitch degree table. 1 20 multiply the feet by 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 roof slope factor chart also consists of conversion factors to determine the slope of the roof. For example the roof layer that protrudes above the roof is 1 so add 1 to your tape reading. The headache of using pythagoras and trigonometry can be spared by making use of these charts.

That is if your tape reads 7 then add 1 that will give you 8 12. The pitch fraction represents a certain amount of vertical rise over the entire span. Select the desired scale. This will give you the rise over run or pitch.

The pitch of this roof is 4 8 12. To convert an architectural drawing scale to a scale factor. The maths behind this number is that it is the square root of rise run 2 1. 1 8 1 0 invert the fraction and multiply by 12.

A speed square and level can be used to easily find the pitch of a 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. Select the desired scale. 20 x 12 scale factor 240.

Image 1 12 to 12 12 roof pitch 7 12 pitch. For example given a roof with. 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. The calculator above can handle much of this math.

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.