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Now I will show you how to insulate a foundation (basement) with your own hands, at least how I did it. I insulated a shallow foundation from the outside using extruded polystyrene foam. The insulation technology is as follows: dig out the soil to the depth we need to install the insulation sheet; clean the surface of the foundation strip; prime the foundation with a deep penetration impregnation; glue the insulation sheets (in my case, it is extruded polystyrene foam, 50 mm thick); protect the insulation with a reinforcing layer of plaster; final finishing of the base. To glue the insulation boards, I used Soudal easy soudabond foam glue, for plastering the boards, glue in 25 kg bags of thermo universal and master super, reinforcing mesh vertex, with a density of 160 grams per square meter.