Wet basement waterproofing

When making decision about vertical and horizontal wet basement waterproofing it is necessary to take into account the groundwater level. The groundwater level should be specified in the construction project. The repair can be conducted by one of the following methods – depending on the nature of leaks and its location.

At dry dividing wall

In case if wet spots have occurred on all basement wall apart from the one, that divides the part of the house with basement from the part of the house without one, it is necessary to check at first, if there is a horizontal waterproofing under the wall. Then you need to dig out the wall with leaks to the base level and to check in what condition the horizontal waterproofing is. If the basement waterproofing integrity is damaged, it is important to repair it using the appropriate material. For bitumen basement waterproofing repair bitumen materials are used; the waterproofing of PVC film is being repaired with the same film.

However, it can occur that during the construction they used unsatisfactory or inappropriate to the situation material and you will have to replace the whole basement vertical waterproofing. Then you need new basement waterproofing, for example, of polyester-based SBS modified rubberoid that is being fused on the preliminarily prepared wall surface. New vertical wet basement waterproofing should be adhered to the horizontal one.

Before backfilling the wall, it is necessary to protect repaired basement waterproofing from puncture – for this purpose you can use, for example, profiled membrane or textile fabric. It is also important to consider the possibility of drainage installation.

French drainage

If wet spots have occurred on all basement walls, at first you need to dig out all available basement walls. You need to waterproof outside walls, as in the previous situation. It is impossible to dig out the wall separating two parts of the house, so you will have to waterproof it from the inside. For this purpose you need to drill out bores vertically on joints of walls neighboring to it. They serve for injection performance and for formation of vertical waterproofing in the wall.

If there is no waterproofing under the wall, you need to waterproof the joint of this wall with the covering above the basement. Apply the waterproofing on the wall surface adhering it with previously made deepened waterproofing on joints with side walls and the covering. Before the second basement walls backfilling you need to dig out the foundation of the part of the house without the basement to the level of its laying. When digging out create the inclination for drainage. In the lowest part there should be a drain pot for water. In such foundation pit there will be installed the french drainage, connected to the water well.