This information shows how trusses may be handled such that no structural damage occurs. It does not infer a safe lifting method for site staff who should take note of both H.S.E. Lifting Regulations and Construction (Design and Management) Regulations 1994.
Mechanical handling for unloading and erecting trusses safely is strongly recommended.
If necessary trusses may be inverted for transport. They may become damaged by incorrect handling. When mechanically handled, the trusses should be banded together in sets and supported when lifting utilising a spreader bar, as shown in fig 2.
Typical Truss Weights
- 35mm thick fink truss @ 7m span & 30° = 35kg
- 47mm thick attic truss @ 8m span & 40° = 110kg
- 3 ply 35mm thick howe girder @ 9m span & 30° = 160kg
It is imperative to prevent damage or deformation to trusses awaiting erection. They should be stored as illustrated (fig 3 & 4) and protected from sun and rain. Adequate allowance must be made for ventilation.
The above images are supplied by Wolf Systems Ltd, taken from their Roof Truss Technical Manual.