We bought an old house with a basement, the walls are damp. From the outside on a pedestal and inside on the ground floor – with floor are visible streaks and a white coating, and plaster begins to crack. What is the reason?

Each cellar should have a sound, matched to the conditions of soil and water on the plot, damp insulation. Often, however, in old houses such isolation is not at all or is damaged. Then the water has easy access to the interior of the house, and along the skirting part of the ground floor walls inside and outside appear white streaks.

The cause moisture

Described by reader moisture basement walls it means that the house has no horizontal and vertical damp proof or damaged. Therefore, as a result of capillary water climbs high above the ground and damp ground floor walls. Salts dissolved therein after evaporation crystallized and create lesions which may cause crumbling plaster and masonry. After a long time can be dangerous for house construction.

To prevent further destruction is needed on foundation walls new horizontal and vertical insulation and damp proofing damp-proof floors on the ground. While the vertical arrangement of insulation and floors on the ground is quite simple, the execution of horizontal isolation is complicated. It is necessary to be excavated foundations of sections no longer than 2 meters and placing in the wall of the insulating material. This can be done by an undercut wall over their entire widths, as closely as possible the level of footing or by hammering sheet metal. Both these solutions are effective, but time consuming and expensive. It is better to choose another method – the creation of a hydrophobic membrane.

Implementation of the hydrophobic membrane

The diaphragm is formed by impregnating the walls of the hydrophobic formulation. For this purpose holes are drilled in the wall on the outside and the inside, and does not introduce special measure. It penetrates the capillary wall and creates an impermeable barrier, preventing water rising from the ground.

Basement walls have yet to secure vertical insulation. They should be in this order to dig out entirely under the supervision of the constructor, clean their surface with remnants of ground to break up any remains of the old insulation vertical cuff and remove inequalities dropping fragments. Then surface of the walls leveled with cement mortar. Only then are made of bitumen emulsion new vertical damp insulation and thermal insulation protects it.