Previous Page                                                                                         Next Page
Risk Assessments and Method Statements
Task Description:
Erection of Trussed Rafter Roof
Structure using Manual handling
Method Ref 01.
Project Title:
Housing Development at
Muddy Lane,
Newtown, Smoke City
This Safe Working Method Statement has been prepared for the following work.
No other work than that referred to must be carried out.
Location of Work Task:
House type A (South Facing only)
on Muddy Lane
Project Title:
Erection and Installation of trussed Rafter
Roof Structure to House Type A
Safe Working Method:

For additional reference regarding this method statement refer to Contractors sketch ref. ***/** as illustrated on page (?) of this site installation guide. At all times this method statement assumes that all
appropriate design considerations have been incorporated and allowed for within the design and layout of the temporary working platforms.  Additionally, it should be noted that this method statement refers only to those operations which have been designated as having a higher level of risk, for all matters associated with this operation reference shall be made and working practices adopted which comply with the Contractors general Risk Assessment for roof work.

Part 1:

1. Construct external perimeter scaffold as per detail in a manner to ensure sufficient manoeuvring space around loading platform. Locate vertical truss restraint standards at position to allow unobstructed lifting to eaves level working platform. All edge protection to both the eaves level and the loading level platforms must be constructed and fixed before any lifting operations take place. Similarly, erect internal working platforms at a level (typically) 300mm below ceiling tie level.
Under no circumstances whatsoever shall any edge protection be removed to facilitate these operations.
2. According to the recommendations of the Manual Handling Risk Assessment use x No. Personnel to manually lift individual trusses via the truss restraint standards to the eaves level working platform. Move trusses along the length of the roof to their final position (where they shall immediately be fixed by carpenters using temporary/permanent bracing - see part 2 of this method statement). NB. Girder trusses shall be raised as single component plies and then the ceiling tie members (min) bolted together according to the details provided by the truss manufacturer and
in locations marked by him on the trusses; rafter and web members may be nailed according to further details provided by the truss manufacturer.
NB. Roof Bracing Details which will include sizes and location of Rafter and Chevron Bracing etc, shall be installed in accordance with the roof designers layout drawing.
Part 2:

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.