Border Blend Topsoil Bulk Bag Buy Topsoil at Topsoil Shop, Deals on Hallstone Blended Loam Topsoil Bulk Bag 500L 460kg 0.5m Buy HSS TOPSOIL BLENDED LOAM BULK BAG Oxford Garden Centre Hallstone Blended Loam Topsoil Bulk Bag 500L 460kg 0.5m Buy HSS. Topsoil is a naturally sandy soil that promotes drainage and fast turf growth. It is suitable for use as an underlay for new turf or to top dress established lawns. Topsoil is naturally more dense than 80 20 and has a higher clay content. As a result of this, it does not drain quite as well, so should only be used lightly when top dressing your lawn. It is also extremely important to sufficiently water topsoil into your lawn. When used underneath turf, Topsoil is a fast draining soil that promotes deep root growth. It can be used safely at higher depths and in areas built upon a clay base. However it is not recommended to use Topsoil in areas which have a naturally sandy base. APPLICATION When using underneath turf we recommend applying Topsoil at a thickness of 50 125mm. When using Topsoil at the maximum depth it is recommended to roll or lightly compact the soil to minimise the risk of uneven surfaces. Topsoil is available by the tonne loose tipped or in approx 850kg Bulk Bags.