***There is a minimum order of 20 x bags unless ordering with a Bulk Bag of Building Materials.*** When working with a 4 parts sand to 1 part cement ratio, you will require approximately nine 25kg bags of cement per bulk bag of sand. (Building materials are delivered usually on the same day as your patio/driveway products and are provided by a Simply Paving contracted merchant from your area. Delivery is made with a craned vehicle for this product and we are unfortunatley unable to deliver building materials on a Saturday. If you need help calculating your requirements, do not hesitate to contact our office on 0800 032 6306.