The internal insulation of the walls and floor of the basements is successful with the builders thanks to the convenience of work and the possibility of repair in the future, since in this case the insulating layer is always almost available for corrections. However, such isolation, arranged without priorly eliminating the pressure of groundwater, usually does not last long and even if the pressure of the water is eliminated during the work, in the future, under the influence of the restored pressure, it swollen by bubbles and falls off. Therefore, the use of the internal insulation of the basements is permissible only with very small surface and groundwater manuals or in cases where it is impossible to make external isolation or its device will cost too much.
The weakest means of internal insulation is the color of the isolated surfaces. For these purposes, fluates, oils, paraffin, potassium soap and bituminous and bituminous emulsions are used. Coloring is carried out according to the plastered cement mortar surfaces, which should be sufficiently dry. With insufficient dryness, the painted surface can be dried with a soldering lamp. Oil painting is carried out in a hot state 2 times. When painting by paraffin during its cooking, water should be completely broken. For one time coloring smooth surfaces of the plaster, it is enough to spend a paraffin 0.5 kg / mg of paraffin. When painting with a soap solution (75 g \ l of water), it is useful to cover the painted surface with a solution of alum in a day.
Bitumine and bituminous emulsions have more energetic insulating abilities in coloring, which are a mechanical mixture of the smallest particles of bitumen or pitch and water, kept from the decay by the presence of a special vehicle, the so -called emulsifier. After painting the isolated surface with such an emulsion, the water evaporates, and bitumen settles on the plaster in the form of a thin film that does not pass water. This method has great advantages over the commonly used methods of surface covering with bitumen, since they need to warm up bitumen to a temperature of more than 100 ° or dissolve it first in solvent, gasoline or some other flying solvent, and the surface before coating with hot or diluted bitumen must be brought into a dry state.