Sand, the manifestation

At the very beginning of construction, it is necessary to trace that the waterproofing of the foundation was carried out efficiently and reliably. When using clay sand, the manifestation of stains cannot be avoided. Under the influence of moisture of the substance, those present are pushed out in it, it is advisable to use pure washed sand. When designing the structure, you need to take care that there would be as few areas of direct effects of atmospheric precipitation.