# Timber trimmers

## Sizes and details for trimming around openings

1 metre loaded length x clear span in metres |
2 metres loaded length x clear span in metres |
3 metres loaded length x clear span in metres |
4 metres loaded length x clear span in metres |
5 metres loaded length x clear span in metres |
6 metres loaded length x clear span in metres |
Size in mm for 2 trimmer beams |
---|---|---|---|---|---|---|

2.36 | 1.91 | 1.58 | 1.35 | 1.15 | 0.87 | 38 x 147 |

2.75 | 2.22 | 1.85 | 1.59 | 1.41 | 1.11 | 38 x 170 |

3.16 | 2.56 | 2.14 | 1.85 | 1.64 | 1.37 | 38 x 195 |

3.58 | 2.90 | 2.42 | 2.11 | 1.88 | 1.63 | 38 x 220 |

2.55 | 2.14 | 1.78 | 1.54 | 1.36 | 1.23 | 47 x 147 |

2.96 | 2.50 | 2.09 | 1.81 | 1.61 | 1.45 | 47 x 170 |

3.41 | 2.88 | 2.41 | 2.10 | 1.87 | 1.69 | 47 x 195 |

3.85 | 3.25 | 2.73 | 2.38 | 2.13 | 1.93 | 47 x 220 |

2.83 | 2.39 | 2.11 | 1.83 | 1.63 | 1.48 | 63 x 147 |

3.28 | 2.78 | 2.46 | 2.14 | 1.91 | 1.73 | 63 x 170 |

3.76 | 3.20 | 2.83 | 2.47 | 2.21 | 2.01 | 63 x 195 |

4.25 | 3.63 | 3.20 | 2.80 | 2.51 | 2.29 | 63 x 220 |

3.00 | 2.54 | 2.26 | 2.03 | 1.81 | 1.64 | 75 x 147 |

3.47 | 2.96 | 2.64 | 2.36 | 2.11 | 1.92 | 75 x 170 |

3.99 | 3.41 | 3.04 | 2.73 | 2.44 | 2.23 | 75 x 195 |

4.50 | 3.85 | 3.45 | 3.08 | 2.77 | 2.53 | 75 x 220 |

**Figure 1**

**Detail**

Proprietary joist hanger to suit joist width and loading.

**Notes:**

- Bolt trimmer using 51mm diameter double sided round tooth plate connectors and M12, grade 4.6 bolts at 600mm centres
- Maximum partition load 0.8kn/m (for example: timber stud partition clad with 9.5mm or 12.5mm plasterboard)
- Notches are not permitted in the trimmer beam.

See figure 2 for positions A, B, C and S

Trimmer size (mm) | For ratios of A/B up to 0.25 Dimension C (m) 1.0 Clear Span (m) S |
For ratios of A/B up to 0.25 Dimension C (m) 2.0 Clear Span (m) S |
For ratios of A/B up to 0.25 Dimension C (m) 3.0 Clear Span (m) S |
For ratios of A/B between 0.26 and 0.49 Dimension C (m) 1.0 Clear Span (m) S |
For ratios of A/B between 0.26 and 0.49 Dimension C (m) 2.0 Clear Span (m) S |
For ratios of A/B between 0.26 and 0.49 Dimension C (m) 3.0 Clear Span (m) S |
For ratios of A/B between 0.5 and 0.74 Dimension C (m) 1.0 Clear Span (m) S |
For ratios of A/B between 0.5 and 0.74 Dimension C (m) 2.0 Clear Span (m) S |
For ratios of A/B between 0.5 and 0.74 Dimension C (m) 3.0 Clear Span (m) S |
---|---|---|---|---|---|---|---|---|---|

2 Number x 38 x 147 | 3.02 | 2.77 | 2.56 | 2.55 | 2.19 | 1.87 | 2.45 | 2.10 | 1.83 |

2 Number x 38 x 170 | 3.51 | 3.23 | 3.01 | 2.97 | 2.55 | 2.19 | 2.84 | 2.44 | 2.13 |

2 Number x 38 x 195 | 4.03 | 3.73 | 3.49 | 3.42 | 2.95 | 2.55 | 3.26 | 2.81 | 2.46 |

2 Number x 38 x 220 | 4.55 | 4.23 | 3.97 | 3.87 | 3.34 | 2.90 | 3.69 | 3.17 | 2.79 |

2 Number x 47 x 147 | 3.25 | 2.98 | 2.77 | 2.75 | 2.44 | 2.12 | 2.64 | 2.36 | 2.06 |

2 Number x 47 x 170 | 3.76 | 3.48 | 3.25 | 3.20 | 2.85 | 2.48 | 3.06 | 2.74 | 2.40 |

2 Number x 47 x 195 | 4.32 | 4.01 | 3.76 | 3.68 | 3.30 | 2.87 | 3.51 | 3.14 | 2.77 |

2 Number x 47 x 220 | 4.87 | 4.54 | 4.27 | 4.16 | 3.74 | 3.26 | 3.96 | 3.54 | 3.13 |

2 Number x 63 x 147 | 3.58 | 3.30 | 3.08 | 3.05 | 2.72 | 2.48 | 2.91 | 2.66 | 2.43 |

2 Number x 63 x 170 | 4.14 | 3.84 | 3.60 | 3.53 | 3.17 | 2.90 | 3.37 | 3.09 | 2.82 |

2 Number x 63 x 195 | 4.73 | 4.42 | 4.16 | 4.06 | 3.66 | 3.36 | 3.87 | 3.55 | 3.24 |

2 Number x 63 x 220 | 5.43 | 5.00 | 4.72 | 4.58 | 4.14 | 3.82 | 4.36 | 4.02 | 3.65 |

2 Number x 75 x 147 | 3.78 | 3.50 | 3.28 | 3.23 | 2.89 | 2.65 | 3.09 | 2.82 | 2.62 |

2 Number x 75 x 170 | 4.37 | 4.07 | 3.82 | 3.74 | 3.37 | 3.09 | 3.57 | 3.28 | 3.05 |

2 Number x 75 x 195 | 5.00 | 4.68 | 4.41 | 4.30 | 3.88 | 3.58 | 4.10 | 3.77 | 3.52 |

2 Number x 75 x 220 | 5.62 | 5.28 | 4.99 | 4.84 | 4.39 | 4.06 | 4.62 | 4.26 | 3.98 |

**Figure 2**

**Detail**

Detail of propriety joist hanger to suit joist width and loading.

**Notes**

- Bolt trimmer using 51mm diameter double sided round toothed plate connectors and M12 grade 4.6 bolts at 600mm centres
- Maximum partition load 0.8kn/m (for example: timber stud partition clad with 9.5mm or 12.5mm plasterboard)
- Notches are not permitted in the trimmer beam

**Last updated:**Wednesday, 24 April, 2024.