These ultra-thin paving pads give adequate lift off the deck. The membrane beneath is protected from direct contact with a heavy paving slab. They can also be used as a simple protection / separation pad, to help prevent damage to the surface beneath from items such as scaffolding, plant pots or garden furniture. There is no mechanical fixing required, the surface is secured by the weight of the slab. This cuts down weight on the roof and also the hassle and mess of laying slabs into mortar. This leads to easier, cheaper and faster installation and makes post-installation site inspection or leak detection much easier. This circular pad is manufactured from PVC into a 150mm diameter disc. A separate polypropylene cross spacer is loose laid onto the top surface to maintain the gap between slabs. For decking, no cross spacer is required Technical Material: PVCThickness / Height Off Surface: 5mmLug Width (Distance Between Slabs): 2.2mm (standard)Lug Height: 15mmWeight Tolerance / Bearing Capacity: 8,000KGOuter Diameter: 150mmAppearance: Flat Disc (On Both Sides)Optional Accessory Product: Cross spacer 3mm, 4mm or 5mm thick