Sand and Aggregates 20/40mm CleanOur 20mm or 40mm clean stone is ideal for drainage use, building and for decorative purposes. 6mm CleanOur 6mm clean is a very fine stone and is used for all types of general building. Sourced locally. ¾ Down / to dustOur 3 /4 down is ideal for use in concreting and general building and is sourced from local quarries. DuffOur duff sourced from local quarries is a fine aggregate used in general building work. General Building SandOur building sand can be used for all general purpose building work ideal for pointing, mortar and brickwork and is sourced locally from Burry Port near Llanelli. Scalping’sScalping’s are mainly used as a fill or sub-base material for binding in driveways and paths. Sharp SandOur sharp sand is ideal for a smooth finish in concreting, screeds and render and is sourced locally from Trefigin near Cardigan.