Welsh Slate provides an extensive range of aggregates, from construction aggregates for the building and highway construction industry to decorative aggregates for landscaping. Aggregates are tested to ensure that they meet specific standards and requirements Decorative aggregates are used in a variety of applications, including car parks, garden footpaths, paths, pond linings and more. Available bagged or in loose loads. Welsh Slate aggregates are a sustainable choice, as they are produced from recycled slate from our quarries.