The depth of the trench, as a rule, is one meter.

The depth of the trench, as a rule, is one meter. If the pit is deeper than the specified parameter, then it is necessary to provide additional strengthening from the shields, otherwise the collapse of the soil may occur. Shields, in turn, are reliably strengthened to prevent their displacement with significant loads. The trench is made wider if, after the foundation is hardened, it is necessary to remove the boards. Shields are fixed with stone or wooden wedges (outside). The inside of the shield structure is closed with polyethylene or roofing material. Thus, a high -quality, smooth surface will be provided with a strip foundation. The strength of the base largely depends on the uniformity of its drying.