Roof Systems Worksheets (8)
Shed Roof Rafter Lengths
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Room RUN x Factor - Factor for Full Thickness of Nailer* = True Rafter Length**
1.0/12 x 1.00347 - 0.125 =
1.5/12 x 1.00778 - 0.125 =
2.0/12 x 1.01379 - 0.125 =
2.5/12 x 1.02147 - 0.125 =
3.0/12 x 1.03078 - 0.125 =
3.5/12 x 1.04167 - 0.125 =
4.0/12 x 1.05409 - 0.125 =
5.0/12 x 1.08333 - 0.125 =
6.0/12 x 1.11803 - 0.125 =
7.0/12 x 1.1577 - 0.125 =
8.0/12 x 1.20185 - 0.125 =
9.0/12 x 1.25 x 0.125 =
*When nailer is 2" nominal framing (2 x 6's, 2 x 8's, etc.)
**True rafter length plus overhang equals net rafter length
Common Rafter Lengths
Room RUN x Run Factor - Factor for Full Thickness of Ridge = True Rafter Length**
1.0/12 x 1.00347 - 0.0625 =
1.5/12 x 1.00778 - 0.0625 =
2.0/12 x 1.01379 - 0.0625 =
2.5/12 x 1.02147 - 0.0625 =
3.0/12 x 1.03078 - 0.0625 =
3.5/12 x 1.04167 - 0.0625 =
4.0/12 x 1.05409 - 0.0625 =
5.0/12 x 1.08333 - 0.0625 =
6.0/12 x 1.11803 - 0.0625 =
7.0/12 x 1.1577 - 0.0625 =
8.0/12 x 1.20185 - 0.0625 =
9.0/12 x 1.25 x 0.0625 =
*When nailer is 2" nominal framing (2 x 6's, 2 x 8's, etc.)
**True rafter length plus overhang equals net rafter length
Hip and Valley Rafter Lengths
Room RUN of Common Rafter x Run Factor = True Rafter Length*
3.0/12 x 0.143614 =
3.5/12 x 1.44398 =
4.0/12 x 1.45297 =
5.0/12 x 1.47432 =
6.0/12 x 1.5 =
7.0/12 x 1.5298 =
8.0/12 x 1.56347 =
9.0/12 x 1.60078 =
10.0/12 x 1.64148 =
11.0/12 x 1.68531 =
12.0/12 x 1.73205 =
Add the Rafter Overhang to this Length*
Roof Rise
Room RUN of Common Rafter x Run Factor = Rise
1.0/12 x 0.0833 =
1.5/12 x 0.1250 =
2.0/12 x 0.1667 =
2.5/12 x 0.2083 =
3.0/12 x 0.2500 =
3.5/12 x 0.2917 =
4.0/12 x 0.3333 =
5.0/12 x 0.4167 =
6.0/12 x 0.5000 =
7.0/12 x 0.5833 =
8.0/12 x 0.6667 =
9.0/12 x 0.7500 =
*When nailer is 2" nominal framing (2 x 6's, 2 x 8's, etc.)
**True rafter length plus overhang equals net rafter length
Shingle and Roofing Nail Quantities
Starter Courses Eave Length (ft) x Factor = Number
Shingles x 0.3333 =
Squares x 0.0042 =
Roof Location and Usage Length of Ridge and Hips (LF) x Factor = Pounds of Nails Number of Shingles or Squares Respfectully
Ridge and Hip Cap Shingles x 0.8000 =
Ridge and Hip Cap Squares x 0.0100 =
Ridge and Hip Caps and Nails 1-1/2" Roofing Nails x 0.0267 =
Ridge and Hip Caps and Nails 1-3/4" Roofing Nails x 0.0308 =
Main Roof Nails Number of Squares x Factor = Pounds of Nails
1" Roofing Nails x 1.5000 =
1-3/4" Roofing Nails x 1.7500 =
Rolls of Felt Paper # 15 Quantities
Main Roof Nails Number of Squares ÷ Factor = Pounds of Nails
Rolls of Felt Paper # 15 Required ÷ 4.0000 = 5lb Box has 1090 Nails
 
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