3. When the first truss has been raised and located in its final position by the truss handling team, the carpenters shall immediately provide temporary diagonal restraints at a minimum of three locations to hold the truss vertical and so as to act as a rigid start point for the erection of the remainder of the trusses. This temporary restraint shall preferably be located outside of the roof structure i.e. Fixed to the external perimeter scaffold. The positioning of the temporary braces in this way will then allow unobstructed passage to the truss handling team as further trusses are raised and located in their final position.
NB. Wherever possible, Carpenters should use prenailed bracing members (accurately marked out to coincide with the truss centres) to ensure that truss erection progresses smoothly and quickly.
4. As soon as sufficient trusses have been temporarily positioned, the carpenters shall commence the fixing of internal permanent bracing to create fully stable sections of roof. Where necessary for carpenters to work at higher levels than the main internal working platform then either stepladders or temporary trestles shall be used between trusses constructed or positioned on the main platform. Under no circumstances shall operatives be allowed to climb within the temporarily braced roof structure.
5. As soon as permanently braced sections of roof have been completed, it shall be allowed for operatives to locate working platforms within the
roof structure by positioning suitable boards directly on top of the ceiling ties. These platforms can then be used for the installation of services etc. Similarly, at this time it is appropriate to allow the removal of the
external temporary props in order to allow any gable masonry construction to be commenced. Gable construction should not have been allowed to
commence prior to this stage as it is the stability of the roof construction which provides restraint to the gable masonry construction.
NB. The dismantling of the internal working platform shall only be allowed to commence below completed areas of roof construction as such time
when no work is being carried out overhead.
6. Further areas of roof construction (if appropriate) shall be carried out according to the identical principles outlined above.