Blue Stone Sub Base (21A)

Blue stone sub base is 21A as a bagged product. 21A gravel consists of ¾” 57 gravel and blue stone powder fines. It is primarily used as a sub base underneath patios, walkways, driveways, pavers and bricks. It will compact down to create a firm, strong foundation underneath stone patios or pathways throughout your landscape. It’s also a popular base to use to patch holes in driveways or on roads as the dust compacts the larger stone keeping it in place.