Basic Envirolok Construction
Envirolok bags are easy to prepare and fill on-site and allow for last minute changes due to the systems versatile design. Our bags can be filled either by hand, or with the aid of mechanical assistance providing highly scalable erosion control solutions.
Fill the Envirolok bags with an engineered soil using an Envirolok Bag Filler. The soil properties should consist of 60% sand, 20% high grade compost and 20% top soil. The engineered soil may change to meet the specific project needs.
Excavated material may be used to backfill during construction. Clay and silt are not appropriate fill material. All bags should be filled consistently and be closed with a UV resistant zip tie. Bags may also be sewn or closed using hog-rings.
Dig a trench no less than 3” deep, 16” wide for the length of the structure. Embedment depth will be specific to the project. Compact bottom of foundation using hand tamper or vibratory plate compactor. This trench serves as toe stabilization and will protect the structure from undermining. Larger structures will require engineering.
The foundation course will begin with placing spikes in the excavated trench at the desired location of the first row. Place filled bags next to each other, seam side in, horizontally, the full length of the structure. The “snorkel” of the bag will land on top of the previously placed bag.
After laying one entire course of bags, compact the soil ensuring a solid and uniform structure. Insert two spikes in the top of each bag evenly spaced. The spike placement will vary with the slope of the structure and should be placed in the center of the bag contact area between courses.
Backfill and compacting after each course ensures strength and stability of the system. Backfill should be compacted to the specifications of the wall design. Backfill must support vegetation and be free draining.
Structures that require geogrid reinforcement will be specified by an engineer. After compaction, geogrid placement will begin at the front of the bag course and will go towards the existing material. Place spikes on top of the geogrid and continue placing bag course. Geogrid should be pulled tight prior to backfill. Continue with course compaction.
Install the top row of the structure the same way the other courses have been placed. Tuck the “snorkel” under to give a finished look to the last course. If specified, the top row may need to be anchored into the existing landscape.
Once the wall is completed, vegetation is the final step. Native vegetation is recommended because of its adept root structures that will bind the wall together forming a monolithic structure that will renew itself year after year. Using vegetation suitable for your local climate is necessary for a successful project.
You may build the wall and place live plants in the courses as you build the structure. Live plant material should always be placed in between the courses. Cutting the bags open and planting into this cavity is NOT recommended. It is recommended that a combination of live plants and seed are used to ensure proper vegetation.