Before you begin construction, you need to figure out depth promerzanija soils, the type and composition of the soil, so if you need a replacement, and the groundwater level and to identify the need for drainage and waterproofing.
Kabla ya kuanza kujenga, unahitaji kujua kina cha udongo kufungia, aina na muundo wa udongo, ili kupata naye uingizwaji, na eneo la chini ya ardhi ngazi ya kutambua haja ya mifereji ya maji na waterproofing.