Temporary Roof Structures
Shrink wrap sheeting can be used as a temporary roof covering, either to provide temporary weather protection or environmental containment to a construction project.
To shrink wrap a temporary roof safely you should bear the following points in mind;
Any roof scaffolding which is to be shrink wrapped must be constructed to allow rainwater to drain easily from the roof surface. The minimum pitch of a shrink wrap temporary roof scaffold should be 10% or 1:10.
The installation of shrink wrap sheeting to create a temporary roof will require the installer to access the top surface of the roof. For this reason it is important to set up a handrail around the roof edge / perimeter of the roof. The handrail provides edge protection to the installers and allows the installers to set up and tension safety lines between handrails if required. (NB that where safety lines are used, it will also be necessary to have a rescue plan and operatives trained in the use of casualty recovery equipment such as the ‘Gotcha’ rescue kit by Spanset – spanset.co.uk)
Having a handrail around the roof edge does not cause significant problems for installing the sheeting. This is because we always recommend shrink wrapping the sides of the scaffolding first and then overlapping the sheeting by 30-40cm on to the top surface of the roof. This means that the side sheet only needs to be cut to go around the handrail stanchions by 30-40cm from the edge of the sheet.
Subsequently, when the roof sheeting is unrolled it in turn is overlapped over the edge of the roof and down the sides of the scaffold sheet by 30cm. This means that the roof sheet only needs to be cut around the stanchions by 30-40cm from the edge of the sheet. The roof sheet and side sheet are then joined by heat welding them together. Finally, patch tape is used to make a seal around the base of each stanchion.