When assembling multi-layer military barriers, the upper layers are generally narrower than the lower ones. For example, if the lower layer is 2 meters wide, the upper layer would be 1 meter wide. When filling the layers, start by completely filling the first layer with two rows placed side by side. Once the first layer is complete, move on to fill the second layer. After filling both layers, a wire mesh can be installed on top. If you’re looking for a professional manufacturer of military barriers, feel free to contact me.