Very simple to use, Deltalok requires little or no specialist tools or labour. 

By following our simple guide below, your projects can be completed with ease.  Should you require further assistance or have a more complicated application, we offer a total Technical & Design Service.


Step 1: Site preparation

The first step to a successful project using Deltalok.  Foundations are not required but the ground should be as level as possible.  However this is not critical, as a step-up in levels can be created during construction.  In any case, the base of the prepared area must be firm and, if necessary, compacted. 

We recommend that you retain as much suitable excavated material as possible, to use for filling the bags at a later stage.

When excavating, your digging must allow for the height and gradient of the structure; laying of the bags; backfilling and, if required, the use of geogrid.

In most cases, no drainage is required as Deltalok is water-permeable.

Step 2: Filling the Deltalok Bags

The Deltalok Bags should be filled with a granular soil mix containing small stones to aid drainage.  Clay and silt are not recommended for filling the bags.

At this stage, grass seed and/or wildflower seed can be added to the bags (please see Step 8 for alternative vegetation options).  This can be done simply by inserting a pipe into the facing edge of the Deltalok Bag and filling with the seed mixture.

Whilst the pipe is still in place, fill the rest of the bag with your soil mix to the required level, then withdraw the pipe. 

Finally, seal the bag with the cable tie provided. 

Step 3: Starting your Deltalok structure

First place the Deltalok Interlocking Plates on the ground, positioning them to sit beneath where you want to place your first row of bags, ensuring that you are reading the This Side Up label. The interlocking plates should sit directly beneath the middle of each bag. To ensure this positioning, space the plates approximately 30 to 33 inches apart.

Place your first row of filled bags over the plates, with the seamed edge of the bag facing the back of the structure. Position the bags with a one to two inch space between each neighbouring bag. Compaction will then fill the bags into the open spaces as you build your structure.

Do not overlap the bags at any stage.

Step 4: Placing additional rows

Place the Deltalok Interlocking Plates over the spaces between the base bags for the entire length of the structure.

You will then be ready to place a further row of bags over the previous row.  This must be done in a running bond format, to ensure the interlocking plates sit beneath the middle of each Deltalok Bag.

After placement, walk on or apply pressure to the tops of the bags to lock them onto the interlocking plates.

Step 5: Backfilling the structure

Fill and compact the backfill every two rows of Deltalok Bags (or no more than 20cm to 30cm depth of fill).  To obtain best results, vibratory compaction equipment should be used.

Please note: a clean gravel zone behind the bags is not required for alignment or drainage (as used in concrete or brick walling structures). 

In time, vegetation will penetrate the Deltalok Bags and grow into the backfilled area, further stabilizing the structure.

Step 6: Using with geogrid
(if required)

For structures requiring further reinforcement, Deltalok can be used in combination with geogrid.  Guidelines for your specific requirements can be provided via our Technical and Design Service.  Below is a basic guide to the process.  

Lay the geogrid so that it covers the area from the front of the bags to the rear of the backfill area.  Place the interlocking plates on top, as per the laying instructions in Step 4.  Pull the geogrid taut, then place the next row of bags on top of the interlocking plates and geogrid, again following the laying instructions in Step 4.  Backfill over the geogrid and compact once the second row is complete.

Step 7: Placing the top row

Place the top row of Deltalok Bags at a 90° angle to the structure alignment.

The deeper embedment created by this placement will anchor the top of the structure and provide for a more stable structure.

Embed the rear section of the bag so that 50% of the bag is covered with backfill soil.  Please note this may require you to use less fill in the top row of bags to allow for creating this shape.

Step 8: Planting

There are many vegetation options for your Deltalok structure.  You may have chosen to add grass seed or wildflower seed to the Deltalok Bags prior to construction, in which case your Deltalok structure is now complete and you will soon begin to see the start of grass/wildflowers sprouting through the bags as the seeds germinate and take root. 

Alternatively, you may decide to plant the Deltalok structure after construction.  Options include live planting; brush layering; hydro-seeding and live staking.  For live planting, simply make a small incision into the bag, remove soil as required to make space, then insert your live planting material.

You may also choose a combination of pre-seeding and live planting, for a stunning, natural effect.