Bradstone Infilta blocks have a nominal joint width of 5mm which is greater than a normal block paving. The Bradstone 3mm Jointing Aggregate should be used for joint filling. Brush in and after ensuring there is not loose aggregate on the surface that could mark the blocks, another pass with the whacker is required. Finally, brush in more aggregate to fill voids as required. 1 x 25kg bag covers 3.50m2 Assistance upon delivery may be a requirement for this product. Please call the office on 0800 032 6306 if you require any further information.