This section is from the book "Building Construction And Superintendence", by F. E. Kidder. Also available from Amazon: Building Construction And Superintendence.

All of the trusses thus far described have horizontal tie-beams,

Span. | Spacing of trusses. | Height out to out. | No. of spaces. | Size of bottom chord. | Size of top chord. | End braces. | Inner braces. | Bolts in joints 1-5. See Fig. 25. | |||||||||

Ft. | Ft. | Ft. | Ins. | Inch. | |||||||||||||

40........ | 12...... | 5 | 6 | 16 | 4-2 | X | 6 | 4-2 | X | 6 | 2 | X | 6 | 2 | X | 6 | 2 - 1 |

7 | 2 | 12 | 4-2 | X | 6 | 4-2 | X | 6 | |||||||||

14........ | 5 | 7 | 16 | 4-2 | X | 6 | 4-2 | X | 8 | 2 | X | 6 | 2 | X | 6 | 3 - 7/8 | |

7 | 3 | 12 | 4-2 | X | 6 | 4-2 | X | 8 | |||||||||

16........ | 5 | 8 | 16 | 4-2 | X | 8 | 4-2 | X | 8 | 2 | X | 8 | 2 | X | 6 | 3-1 | |

7 | 4 | 12 | 4-2 | X | 8 | 4-2 | X | 8 | |||||||||

50.......... | 12......... | 6 | 8 | 16 | 4-2 | X | 8 | 4-2 | X | 8 | 2 | X | 10 | 2 | X | 8 | 3 - 1 |

and | |||||||||||||||||

8 | 8 | 12 | 4-2 | X | 8 | 4-2 | X | 8 | 2 | X | 6 | ||||||

14........ | 6 | 8 | 16 | 4-2 | X | 8 | 4-2 | X | 8 | 2 | x | 10 | 2 | X | 8 | 3 - 1 1/8 | |

and | |||||||||||||||||

8 | 8 | 12 | 4-2 | X | 8 | 4-2 | X | 8 | 2 | X | 6 | ||||||

16.......... | 6 | 9 | 16 | 4-2 | X | 8 | 4-2 | X | 10 | 2 | X | 10 | 2 | X | 8 | 3 - 1 1/8 | |

and | |||||||||||||||||

8 | 8 | 12 | 4 - 2 | X | 8 | 4-2 | X | 8 | 2 | X | 6 | ||||||

60........... | 12...... | 8 | 4 | 16 | 4-2 | X | 10 | 4-2 | X | 10 | 2 | X | 10 | 2 | X | 8 | 3 - 1 1/8 |

10 | 10 | 12 | 4-2 | X | 10 | 4-2 | X | 10 | |||||||||

14......... | 8 | 4 | 16 | 4-2 | X | 10 | 4-2 | X | 10 | 2 | X | 10 | 2 | X | 8 | 3 - 1 1/8 | |

10 | 10 | 12 | 4-2 | X | 10 | 4-2 | X | 10 | |||||||||

16......... | 8 | 4 | 16 | 4-2 | X | 10 | 4-2 | X | 10 | 2 | X | 10 | 2 | X | 8 | 3 - 1 1/4 | |

10 | 10 | 12 | 4-2 | X | 10 | 4-2 | X | 10 | |||||||||

70......... | 14........ | 9 | 5 | 16 | 4-2 | X | 10 | 4-2 | X | 12 | 2 | X | 10 | 2 | X | 8 | 1 - 2 1/4 |

12 | 4 | 12 | 4-2 | X | 10 | 4-2 | X | 10 | |||||||||

16..... | 9 | 5 | 16 | 4-2 | X | 10 | 4-2 | X | 12 | 2 | X | 10 | 2 | X | 8 | 1 - 2 3/8 | |

12 | 4 | 12 | 4-2 | X | 10 | 4-2 | X | 10 | |||||||||

18......... | 9 | 6 | 16 | 4 - 9, | X | 10 | 4-2 | X | 12 | 2 | X | 10 | 2 | X | 8 | 1 - 2 1/2 | |

12 | 6 | 12 | 4-2 | X | 10 | 4-2 | X | 12 | |||||||||

80....... | 14...... | 11 | 0 | 16 | 4-2 | X | 12 | 4-2 | X | 12 | 2 | X | 10 | 2 | X | 8 | 1 - 2 3/4 |

14 | 0 | 12 | 4 - 2 | X | 12 | 4-2 | X | 12 | |||||||||

16..... | 11 | 2 | 16 | 4-2 | X | 14 | 4-2 | X | 14 | 2 | X | 12 | 2 | X | 10 | 1 - 3 | |

and | |||||||||||||||||

14 | 0 | 12 | 4-2 | X | 12 | 4-2 | X | 12 | 2 | X | 8 | ||||||

18...... | 11 | 2 | 16 | 4-2 | X | 14 | 4-2 | X | 14 | 2 | X | 12 | 2 | X | 10 | 1 - 3 | |

and | |||||||||||||||||

14 | 1 | 12 | 4-2 | X | 12 | 4-2 | X | 14 | 2 | X | 8 |

Uprights at end same size as end braces.

which are the most desirable as well as the most economical whenever the conditions will permit.

In roofing churches, public halls, etc., a raised ceiling is often desired in order to give greater height to the room, without increasing the height of the walls.

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