We recommend the use of fully transparent grade my PE Film. This is the only way to ensure that the workmen do not lose their way when installing the shear connectors. The thinner the film, the greater the risk that the film wraps round a shear connector as it is screwed in. Butted timber ends may be loosely overlapped by 30 to 40 mm cm. As the concrete is linked with the wall by means of a butted connection, the film should be affixed peripherally to the wall at a height of 40 cm for the duration of the construction period.