TIMBER FRAMING DESIGN
Multiplier Table
Pitch°
|
Rafter
|
Hip
|
Rise
|
Short
|
10
|
1.01543
|
1.42516
|
0.17633
|
0.60926
|
11
|
1.01872
|
1.42751
|
0.19438
|
0.61123
|
12
|
1.02234
|
1.43010
|
0.21256
|
0.61340
|
13
|
1.02630
|
1.43293
|
0.23087
|
0.61578
|
14
|
1.03061
|
1.43602
|
0.24933
|
0.61837
|
15
|
1.03528
|
1.43937
|
0.26795
|
0.62117
|
16
|
1.04030
|
1.44299
|
0.28675
|
0.62418
|
17
|
1.04569
|
1.44688
|
0.30573
|
0.62742
|
18
|
1.05146
|
1.45106
|
0.32492
|
0.63088
|
19
|
1.05762
|
1.45553
|
0.34433
|
0.63457
|
20
|
1.06418
|
1.46030
|
0.36397
|
0.63851
|
21
|
1.07114
|
1.46538
|
0.38386
|
0.64269
|
22
|
1.07853
|
1.47079
|
0.40403
|
0.64712
|
23
|
1.08636
|
1.47654
|
0.42447
|
0.65182
|
24
|
1.09464
|
1.48264
|
0.44523
|
0.65678
|
25
|
1.10338
|
1.48911
|
0.46631
|
0.66203
|
26
|
1.11260
|
1.49596
|
0.48773
|
0.66756
|
27
|
1.12233
|
1.50320
|
0.50953
|
0.67340
|
28
|
1.13257
|
1.51087
|
0.53171
|
0.67954
|
29
|
1.14335
|
1.51897
|
0.55431
|
0.68601
|
30
|
1.15470
|
1.52753
|
0.57735
|
0.69282
|
31
|
1.16663
|
1.53657
|
0.60086
|
0.69998
|
32
|
1.17918
|
1.54611
|
0.62487
|
0.70751
|
33
|
1.19236
|
1.55619
|
0.64941
|
0.71542
|
34
|
1.20622
|
1.56683
|
0.67451
|
0.72373
|
35
|
1.22077
|
1.57807
|
0.70021
|
0.73246
|
36
|
1.23607
|
1.58993
|
0.72654
|
0.74164
|
37
|
1.25214
|
1.60245
|
0.75355
|
0.75128
|
38
|
1.26902
|
1.61568
|
0.78129
|
0.76141
|
39
|
1.28676
|
1.62965
|
0.80978
|
0.77206
|
40
|
1.30541
|
1.64441
|
0.83910
|
0.78324
|
Students should use the sin,
cos and tan funtion rather then the Multiplier Table to calculate
the length of the roof members. Remember practice makes perfect; it takes
some time to get use to these functions.
The more you practise the more
familiar you become using these functions
Click here
for further trigonometry information.
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