Symphony Planks by Marshalls introduces a new design texture and added interest for garden projects. As well as coming in a variety of shades, single size and project packs, the range now has a planked addition. The slabs are finished with a convincing wood effect but without the accompanying maintenance issues associated with wood decking. Full packs come with jointing compound included with a choice of buff or grey, Marshalls also recommend purchasing a slurry primer as an extra adhesive.