Estimating Edge’s team of experienced construction professionals and software engineers have developed the industry’s smartest takeoff and estimating software solutions for competitive estimates.
Don’t just estimate faster. Estimate better.™
Calculate Gables & Rakes
How To Calculate Gables & Rakes
To calculate the pitch of a Hip/Valley of a roof, The EDGE has to calculations based on specific points of reference, every time. The EDGE uses Plan View to calculate measurements and to apply a specific formula to its measurements. That formula is the “Pythagorean Theorem” using the following examples.
Calculating Gable Ends:
Using the Pythagoras’s Theorem – a2 + b2 = c2 where: (a = 6′ 0″ and b=12′ 0″)
The EDGE then calculates the distance of the Hypotenuse or in this case c2.
a2 + b2 = c2
62 + 122 = c2
36 + 144 = c2
c2= 180 or
c = 13.416
Therefore, when you measure a Gable End, in “Plan View”, if the Flat (Base of Gable) is 12′ 0 “, The EDGE Gable Length will show 13.416′.
That being said, if we take 13.416 and divide it by 12 ( 13.416 / 12 ), this will give us our “multiplication factor” for our pitch – 13.416 ÷ 12 = 1.118
This is the factor that The EDGE uses to measure, In Plan View, for a 6/12 Pitch.
Calculating Hips & Valleys:
Looking at the roof plan below, we’ll demonstrate how The EDGE calculates the Hips & Valleys using the same 6/12 Roof system that we just looked at.
Here again, we can see how this formula works.
a2 + b2 = c2
Where: 36 + 289 = c2
C = 18.027
In Plan View, you are actually measuring the base of the Hip/Valley, and The EDGE is calculating the Hypotenuse of the Triangle.