Wallbarn fixed height paving pedestal discs have been specially designed to improve drainage even at these very low heights. Wallbarn's circular pads are manufactured from PVC into 150mm diameter discs. The upper surface is moulded into a series of circular ridges and grooves which encourages the rainwater to run off the surface of the pad. Water will not be held on the surface of the disc, which means there is less risk of standing water affecting the timber joists in the long term. The Wallbarn TD headpiece has side bars 60mm apart, meaning a standard 2” / 50mm wide timber joist can be placed between the bars. The joists will form a framework structure for the decking system and the decking planks are fixed to that framework. These pads are ideal for areas where a very tight height threshold is present, for example, on refurbishment projects. In certain circumstances it may be easier to simply overlay the existing surface with a new layer of decking rather than take everything up, and with the 7mm discs this is possible. As with all the Wallbarn supports range there is no mechanical fixing required, the surface is secured by the weight of the deck itself. This leads to easier, cheaper and faster installation and makes post-installation site inspection or leak detection much easier. Properties Lug material: PVCWeight tolerance: 8,000kgOuter diameter: 150mmThickness: 7mmNumber of drainage holes: 6Distance between lugs: 60mm