Plate. Fastening device with pillar PEL for intenally insulated roofs on tongue & groove or light concrete substrates with felt or PVC sheet layer. Attachment to tongue & groove boards, plywood and to light concrete, with through bolts and steel MOTH backing plates of lengths 500 mm or VIPP folding bolts of suitable length. Sealed with IMUF2 at pillars. Order PEL and IMUF2 separately.