Calculated Industries 3088 - Manual (Page 36)

Area for Roofing Materials
You’re ordering roofing materials for a roof
with a 5-in-12 Pitch, an overall span of 27 feet
and a length of 34 feet 6 inches (across). How
many squares are there?
The three steps to this problem are: (1) Find
the common rafter, (2) Multiply it by the building
length, and (3) Multiply this figure by two since
you’re ordering materials for both sides of the
roof.
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Step 1 — Find Common Rafter Length
Enter Pitch
5 [Inch] [Pitch]
Find and enter Run 27 [Feet] [÷] 2 [=]
[Run]
Find common rafter [Diag]
Answer: 14 FT 7-1/2 IN
Convert to decimal feet [Feet]
Answer: 14.625 FT
Step 2 — Find Area of One Side
Multiply by length [x] 34 [Feet]
6 [Inch] [=]
Answer: 504.5625 SQ FT
Step 3 — Find Area of Both Sides
Multiply by 2 sides
[x] 2 [=]
Answer: 1009.125 SQ FT
Divide by 100 sq. ft.
for roofing squares [÷] 100 [Sq]
[Feet] [=]
Answer: 10.09125 squares
36 — Construction Master III ®