Al’s Concrete Product’s has been installing pre-cast bunker silos for over 40 years. Through our experience we have come up with some recommendations. We recommend that the bunker silo site have at least a ½% to 2% slope. We also recommend using approximately 8” of 1”to 2” screened rock under each wall covering a 4” tile line with a gravity outlet. The reason for the tile line is to keep the soil dry under the wall for better stability and to keep excess moisture and rainwater out of the feed, thus giving you higher quality feed.
If you don’t use the drain tile recommendation we still would want an 8” compacted gravel base under each wall for stability. This could vary though, depending upon soil conditions.
The base must be rough graded to within 1” of final grade. When we come to install the walls our crew will do the final grading. The customer will furnish Al’s Concrete with a skid loader and fine gravel (3/8” or less) to do the final grading.
Als Concrete Products, 800 Town Hall Road, La Crescent, MN. 55947
Phone: 800-982-9263 or 507-895-4509 Fax: 507-895-6805