The strength of soil blocks depends on several factors, including the type of soil used, the amount of stabilizing agent used, compaction quality, drying method and strength testing method. The minimum compressive strength of soil blocks in air-dry condition must be at least 25 kg/cm2. Soil blocks are subjected to tests similar to those that bricks and concrete blocks are subjected to. It is necessary to test the first samples of soil blocks at the construction site. These tests will assess the suitability of the block as a wall material.