The invention concerns a proceeding and means for, among other things, stopping or at least slowing down emission (1) of organic contaminant or other chemical contaminants from subjacent chemically contaminated covered floor (2), wall, ceiling, or other construction surface from penetrating the covering (3) on said floor (2), wall, ceiling, or other construction surface, wherein absorbent (4) is utilized therefor in intended matrix (5) that is applied on said floor (2), wall, ceiling, or other construction surface. According to the invention, the absorbent (4) in question in, e.g., solid state or powdered form is embedded in an encapsulant (6) intended therefor that solidifies, and that, when the matrix (5) is in a liquid state, said absorbents (4) embedded by the encapsulant (6) are added with the intended quantity to said matrix (5), which then is applied on the intended surface therefor with the desired quantity. When the matrix (5) is drying, curing, or in another way is solidifying, said absorbents embedded by the encapsulant (6) are uncovered after the surrounding encapsulant has been disintegrated.