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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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