Pvc Membrane Weld Plates are available for use with TPO Waterproofing Membrane, PVC Waterproofing Membrane, EPDM Waterproof Membrane, and other Roofing Waterproofing Sheets.. Suitable for rigid substrates such as gypsum board, cement board, etc., then induction welded with thin films to form non-vertical connections to resist wind loads. Plate diameter: 80mm; Hole diameter: 6.8mm. Color: Front side: pink/purple; Back side: Epoxy light brown/light grey/Or anti-finger print alu-zinc film.