The Configure Multipliers table allows you to save a ton of time with math and guess work.  We have used trigonometry to generate the required multipliers to figure the roof pitch area by simply finding the roof deck area.

For Example:  A roof that has a pitch of 1/12, or for every one foot vertical roof distance (rise) there is 12 feet of horizontal roof distance (run).

a=1   b=12  c=?

12+122=c2

145=c2

C=12.041594578

We are not necessarily looking to know what C is in this case.  We want to know how it relates to b in our example because b represents the roof deck and c is the roof pitch area.

Therefore:  c/b = ratio or multiplier

12.041594578/12 = 1.00347   which is our multiplier

 

Roof Multiplier: Multiply the Roof Deck by the Multiplier to get the area of the pitched roof.

Label

Multiplier

1/12

1.00347

2/12

1.01379

3/12

1.03078

4/12

1.05409

5/12

1.08333

6/12

1.11803

7/12

1.1577

8/12

1.20185

9/12

1.25

10/12

1.30171

11/12

1.35657

12/12

1.41421

13/12

1.47432

14/12

1.53659

15/12

1.60078

16/12

1.66667

17/12

1.73405

18/12

1.80278

 

 

 

 

 

The multipliers are maintained in the settings dropdown under Configure Multipliers. For more information on how to configure your multipliers, use the following link: Configure Multipliers