How to make foundation waterproofing reliably: Tips- Review + Video

Not only the quality of construction depends on the foundation, but also the durability of the house itself. Therefore, it is very important to protect it from water, which is easily absorbed into concrete and has a detrimental effect on it.

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Through the capillaries of the concrete foundation, water can penetrate the walls and floor of the house, where it contributes to the growth of fungi and the development of mold.

If metal beams or wooden piles are involved in the construction of the foundation, then these materials also need protection from water, since wood is prone to decay, and metal is corroded.

Do you need foundation waterproofing

For those who forgot to waterproof the foundation during construction, you should know that thawing in spring water increases in volume and destroys the basis of the entire structure.

To protect your house from expensive repairs in the future, you need to properly waterproof the foundation of the house in advance.

In order to make the waterproofing of the foundation of the house yourself, you first need to find out :

  • at what depth is the groundwater;
  • how strong is the earth saturated with moisture in the spring;
  • type of soil;
  • type of building and its operating conditions.

What waterproofing of the foundation is required depends on these factors.

When the groundwater level is one meter and deeper from the base of the foundation, waterproofing of the foundation can be made with roofing felt and a vertical coating.

If the level is less than 1 m.

from the base of the foundation, horizontal insulation should be laid in two layers, smearing between the layers with mastic.
As for vertical insulation , then apply coating and paste over with roll materials. Also, in order to hinder the penetration of water through the capillaries, it is recommended to treat the basement with penetrating waterproofing.

If the construction of a house takes place in a place with a humid climate and the groundwater level is high enough, in addition to the above measures to protect the foundation, a drainage system should be equipped to drain water into a special well.

Materials for waterproofing the foundation


An important question when protecting the base of a house - how much does it cost to waterproof the foundation?

It depends on several factors: the area of ​​the treated surface and the quality of waterproofing materials.

The cheapest material is bitumen, it retains moisture well and is very easy to use, itself the material does not decompose on contact with water. Waterproofing the foundation with bitumen is easy to do with your own hands.

In case of high soil moisture and the proximity of groundwater to the foundation of the house, it is necessary to additionally purchase coating, roll and penetrating materials, as well as calculate the cost of drainage construction.

Inexpensive materials for waterproofing the foundation are waterproofing impregnation deep penetration and waterproofing plaster . These materials are not used as the main insulator.

The task of impregnation is to fill cracks in concrete, which in turn prevents water from entering the foundation, provides frost resistance and prevents corrosion.

Plaster serves more to improve the quality of the insulating material, because it contains special additives and plasticizers. Plaster is used not only as a decorative coating, but also to extend the life of the main insulator.

Roll insulators
the most common method of waterproofing a foundation. There are insulators with an already glued layer of bitumen, which must be heated with a burner, and those that require an additional adhesive layer.

In comparison with roofing felt, roll insulators benefit significantly.

They are more resistant to moisture, do not fade in the sun, more flexible and able to take the shape of the surface, which they are designed to protect, as a result of which they are less susceptible to mechanical damage.

Rubber insulation is the most reliable, durable, but also the most expensive way to waterproof a foundation.

Liquid rubber is poured over the entire surface of the foundation and ensures a secure connection to the foundation.

This type of insulation usually requires special tools, but you can do it yourself.

Using a roller, liquid rubber is applied to the primed surface. The number of layers and drying depends on the material manufacturer.

Foundation waterproofing works

Let's look at the waterproofing of the most complex foundations in terms of technology - strip and monolithic. Their waterproofing is carried out at two levels: below the basement level by 15-20 cm, and in the basement, at the junction of the walls with the foundation.

At the very beginning of the work, a thick layer (20-30 cm) of oily clay is laid on the bottom of the pit.

Next, the surface is poured with concrete 7 cm thick and left for a week to harden. After the concrete has hardened and the entire area has settled, it is abundantly coated with bituminous mastic, a ball of roofing material is placed on top, the surface is again coated with mastic, and the second layer of roofing material is again laid.

Next, the surface is poured with concrete 5-7 cm thick and ironed. After 2-3 hours, as the fresh layer of concrete was poured, sprinkle sieved cement on top and let it absorb moisture.

Dries like any other concrete screed: periodically moisten with water and cover the foundation with foil.

Such actions are performed once a day until the concrete completely hardens and gains strength.


The drainage system can be arranged both during the construction of the house and upon completion of construction.

The system is designed to drain into a well or ditch the water that collects around the house.

At a distance from the house, not less than 0.7 m, a ditch is dug around the entire perimeter from 30 to 40 cm in width.

The depth of the trench is selected according to the level of groundwater. Direct the ditch with a slight slope towards the well.

The bottom is laid with geotextiles so that the edges of the material can be wrapped about 80 cm on the sides of the ditch. The bottom is covered with rubble or gravel 5 cm thick and then a perforated pipe is laid with a slope of half a centimeter per meter.

From above, the washed gravel is covered with a layer of 20-30 cm and the edges of the geotextile are wrapped.

The pipe is led to the well and the entire trench is covered with soil.

( 1 grade, average 1 of 5 )